The dolomite problem; control of precipitation kinetics by temperature and saturation state
Open accessAbstract
The mineral dolomite and the uncertainties surrounding its origin have attracted the attention of earth scientists for over a century. The core of the dolomite problem is the apparent paradox posed by the paucity of dolomite in modern marine depositional environments versus its relative abundance in the sedimentary rock record. Solving this problem requires knowledge of the conditions under which the mineral forms and the rate of precipitation under those conditions. As a working hypothesis, it is suggested that the precipitation rate of dolomite may be quantified and modeled in a manner similar to other carbonate minerals through application of a rate law that represents the rate as a simple function of saturation index, r = k (Omega - 1) ^n^ . This hypothesis is tested in a series of experiments by measuring the steady state rate of dolomite precipitation in a dolomite-seeded flow reactor through analysis of reacted fluid chemistry. By varying temperature from approx 100 degrees to 200 degrees C and saturation index (Omega ) from near saturation to approximately 100, sufficient data were collected to solve for the reaction order and Arrhenius rate constant (k = A exp {-(epsilon ~A~ /RT)}) of this rate law. The dolomite produced in these experiments was variable in composition but typically a calcium-rich protodolomite, forming syntaxial overgrowths on the seed material. At the highest supersaturations obtained, formation of distinct nucleation centers was observed. These experiments do confirm a strong temperature dependence for the precipitation reaction (activation energy epsilon ~A~ = 31.9 kcal mol (super -1) ) and moderate dependency on saturation index (n = 2.26, log A = 1.05). The experimental findings of this paper suggest that the abundance of dolomite in the sedimentary rock record reflects, at least in part, environmental changes in temperature and seawater chemistry over geologic time.
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TL;DR
This paper tests whether dolomite precipitation can be described by a simple saturation-state rate law, using seeded flow-reactor experiments at elevated temperatures. It finds a strong temperature dependence and moderate saturation-state dependence, implying that dolomite abundance in the rock record may partly reflect past changes in temperature and seawater chemistry.
Key findings
- Dolomite precipitation rates fit an Arrhenius-type rate law, with activation energy of 31.9 ± 1.6 kcal mol⁻¹ from total-alkalinity data, reaction order n = 2.26, and log A = 1.05 for the selective fit; the extrapolated 25°C rate constant is 10⁻²²·³.
- The precipitated phase was typically calcium-rich protodolomite, commonly 55–58 mol percent CaCO₃, forming syntaxial overgrowths on seed grains; distinct nucleation centers appeared only at high supersaturation, around log(Ω − 1) ≥ 2.
- Magnesian calcite, about 15 mol percent MgCO₃, competed with dolomite and appeared to precipitate at dolomite’s expense, even driving dissolution of newly formed dolomite; the paper found no evidence that magnesian calcite acted as a precursor.
- Model extrapolations indicate that observing enough dolomite growth at 25°C would require roughly 10¹ to 10² years, making direct laboratory synthesis at surface temperatures impractical, while reaction times at about 50°C are still long but less unreasonable.
Methods
- A dolomite-seeded, circulating flow reactor was used with about 5 g of seed dolomite, temperatures from 115° to 196°C, input solutions of CaCl₂, MgCl₂, and NaHCO₃ under varied pCO₂, and a recycle ratio up to about 100.
- Steady-state precipitation rates were calculated from differences between input and output solution chemistry, mainly total alkalinity and total divalent cations, normalized to seed surface area; solids were analyzed by XRD, SEM/EDS, and BET or geometric surface-area estimates.
- An aqueous speciation model using SUPCRT92/HKF thermodynamics computed saturation states with respect to ideal dolomite, and regressions solved for activation energy, reaction order, and the pre-exponential factor.
Limitations
- Stated: the Arrhenius treatment assumes terms other than temperature are invariant, but this is not exact; saturation states were calculated relative to ideal dolomite even though the growing phase was likely more soluble and less ordered; high solid-to-solution ratios caused saturation indices to fall as temperature rose, so the reported activation energy is probably a minimum.
- Stated: the dataset is small, surface-area estimates are uncertain, geometric and BET areas were mixed, possible Fe/Ni/Cr contamination had unknown kinetic effects, and coprecipitating phases could reduce the area available for dolomite growth.
- Evident from the text: the experiments were conducted far above Earth-surface temperatures, so the 25°C conclusions depend on extrapolation; the rate law does not explicitly account for Mg/Ca ratio or ionic strength, and variability in product composition and cation ordering may affect rates.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
0 of 47 cited sources checked · 0 supported · 0 flagged
- Findingown data
The pre-exponential term of the dolomite precipitation rate law is log A = 1.05.
“moderate dependency on saturation index (n ؍ 2.26, log A ؍ 1.05)”
Quote in the paperNot a substantial claim- The authors state this as an assumption: The precipitation rate of dolomite can be described by a rate law of the form r = k(Ω − 1)^n.
- The authors state this as an assumption: The rate constant k has an Arrhenius form.
- Findingown data
The precipitation rate of dolomite has a moderate dependency on saturation index, with reaction order n = 2.26.
“moderate dependency on saturation index (n ؍ 2.26, log A ؍ 1.05)”
Quote in the paperSubstantial claim- The authors state this as an assumption: The precipitation rate of dolomite can be described by a rate law of the form r = k(Ω − 1)^n.
- The authors state this as an assumption: The rate constant k has an Arrhenius form.
- Findingown data
The precipitation reaction of dolomite has a strong temperature dependence, with activation energy εA = 31.9 kcal mol−1.
“These experiments do confirm a strong temperature dependence for the precipitation reaction (activation energy ⑀ A ؍ 31.9 kcal mol ؊1 )”
Quote in the paperSubstantial claim- The authors state this as an assumption: The precipitation rate of dolomite can be described by a rate law of the form r = k(Ω − 1)^n.
- The authors state this as an assumption: The rate constant k has an Arrhenius form.
- Findingown data
At the highest supersaturations obtained, formation of distinct nucleation centers was observed.
“At the highest supersaturations obtained, formation of distinct nucleation centers was observed.”
Quote in the paperNot a substantial claim - Findingown data
Coprecipitated phases, including calcite, magnesian calcite, and magnesite, were also identified by SEM/EDS and XRD.
“Coprecipitated phases, including calcite, magnesian calcite, and magnesite (MgCO 3 ), were also identified by SEM/EDS and XRD.”
Quote in the paperNot a substantial claim
- Findingnone given
Solutions are undersaturated at these temperatures with respect to all carbonate mineral phases except dolomite and magnesite.
“Solutions are undersaturated at these temperatures with respect to all carbonate mineral phases except dolomite and magnesite.”
Quote in the paperSubstantial claim - Findingown data
X-ray powder diffraction data from reacted seed materials indicated no phase other than dolomite present.
“X-ray powder diffraction data carefully collected from reacted seed materials indicated no phase other than dolomite present”
Quote in the paperSubstantial claim - Findingown data
EDS analysis of these areas showed them to range from 52 to 59 percent CaCO3, in good agreement with the range of data from fluid chemistry.
“EDS analysis of these areas showed them to range from 52 to 59 percent CaCO 3 in good agreement with the range of data from fluid chemistry.”
Quote in the paperNot a substantial claim - Findingown data
In temperature-varied runs, there is no indication that any phase other than dolomite precipitated.
“There is no indication that any phase other than dolomite precipitated in these runs.”
Quote in the paperSubstantial claim - Findingown data
Comparison of differences in total alkalinity and total divalent cations indicates a good mass balance.
“Although comparison of differences in total alkalinity (⌬A T ) and total divalent cations (⌬M 2ϩ ) indicates a good mass balance (fig.6, top left)”
Quote in the paperNot a substantial claim - Findingnone given
The composition, texture, and extent of development of the new dolomite phase was variable.
“The composition, texture, and extent of development of this new phase was variable.”
Quote in the paperNot a substantial claim - Findingown data
The development of new heteronuclei on seed material surfaces is shown in figure 5, having compositions of magnesite, magnesian calcite, and dolomite.
“The development of new heteronuclei on seed material surfaces is shown in figure 5, having compositions of magnesite, magnesian calcite, and dolomite.”
Quote in the paperNot a substantial claim - Findingown data
No shift in absolute position of the 510146 peak was found in comparisons of unreacted and reacted samples.
“and no shift in absolute position of the 510146 peak was found in comparisons of unreacted and reacted samples.”
Quote in the paperSubstantial claim - Findingown data
Evaluation of differences in calcium and magnesium uptake suggests growth of a phase more calcium-rich than the calcian dolomites typical of most runs.
“evaluation of the differences in calcium and magnesium uptake suggests growth of a phase more calcium-rich than the calcian dolomites typical of most runs (fig.6, bottom left).”
Quote in the paperNot a substantial claim - Findingown data
Calculation of saturation state revealed moderate supersaturation with respect to pure calcite (log Ω between 0.18 and 0.21).
“Calculation of saturation state revealed moderate supersaturation with respect to pure calcite (log ⍀ between 0.18 and 0.21).”
Quote in the paperNot a substantial claim - Findingown data
In experiments supersaturated with respect to calcite and dolomite (run Ti12, 150°C), unique intergrowths of dolomite, magnesian calcite, and essentially pure calcite were observed.
“In experiments supersaturated with respect to calcite and dolomite (run Ti12, 150°C), unique intergrowths of dolomite, magnesian calcite, and essentially pure calcite were observed.”
Quote in the paperNot a substantial claim - Findingnone given
The total growth over the entire experiment was ~1 percent of the seed material.
“The total growth over the entire experiment was ϳ1 percent of the seed material.”
Quote in the paperSubstantial claim - Findingown data
Magnesian calcite compositions have an average composition from EDS of 85% CaCO3.
“Magnesian calcite compositions have an average composition from EDS of 85 percent CaCO 3 .”
Quote in the paperNot a substantial claim - Findingreasoning
Steady state saturation indices actually decreased with increasing temperature.
“As a result, steady state saturation indices actually decreased with increasing temperature.”
Quote in the paperSubstantial claim - Findingown data
Despite decreasing availability of dissolved reactants, the increasingly negative free energy of reaction to form ideal dolomite yields a region of favorable reaction at temperatures ≳150°C.
“We observe that despite the decreasing availability of dissolved reactants (note the conversion of HCO 3 Ϫ and CO 3 2Ϫ to CO 2 with increasing temperature in fig.10), the increasingly negative free energy of reaction to form ideal dolomite yields a region of favorable reaction at temperatures տ150°C.”
Quote in the paperSubstantial claim - Findingown data
The activation energy computed from total alkalinity differences (ΔAT) is 31.9 ± 1.6 kcal mol−1.
“The activation energy computed from total alkalinity differences (⌬A T ) is the largest at 31.9 Ϯ 1.6 kcal mol Ϫ1 .”
Quote in the paperSubstantial claim - Findingown data
Samples reacted at high supersaturation with respect to dolomite (logΩ approximately 2, run Ti01, 150°C) showed surface nucleation of other carbonate phases as well.
“Samples reacted at high supersaturation with respect to dolomite (log⍀ ϳ 2, run Ti01, 150°C) showed surface nucleation of other carbonate phases as well.”
Quote in the paperNot a substantial claim - Findingown data
The original dolomite seed grains retrieved from the reactor after these experiments showed clear evidence of precipitation of new material of dolomite composition.
“The original dolomite seed grains retrieved from the reactor after these experiments showed clear evidence of precipitation of new material of dolomite composition.”
Quote in the paperSubstantial claim - Findingown data
In long-duration experiments at fixed temperature (run Ti11, 135°C), the appearance of magnesian calcite exerted a strong control over the effective precipitation rate of dolomite.
“the appearance of magnesian calcite was found to exert a strong control over the effective precipitation rate of dolomite.”
Quote in the paperSubstantial claim - Findingown data
Epitaxial growth of dolomite and magnesian calcite appears to begin with the development of irregular submicron particles that coalesce to form larger rhombs.
“In contrast, epitaxial growth of dolomite and magnesian calcite appears to begin with the development of irregular submicron particles that coalesce to form larger rhombs.”
Quote in the paperNot a substantial claim - Findingown data
Growth of magnesite proceeds by the nucleation of submicron rhombic crystallites, often exhibiting irregular or curved faces.
“Growth of magnesite proceeds by the nucleation of submicron rhombic crystallites, often exhibiting irregular or curved faces (fig.5, bottom right).”
Quote in the paperNot a substantial claim - Findingown data
The appearance of these coprecipitated phases is confirmed by reacted fluid chemistry.
“The appearance of these phases is confirmed by reacted fluid chemistry.”
Quote in the paperNot a substantial claim - Findingown data
Fluid chemistry data confirm development of essentially pure calcite during certain phases of run Ti12.
“Fluid chemistry data confirm development of essentially pure calcite during certain phases of this experiment.”
Quote in the paperNot a substantial claim - Findingown data
XRD data indicate appearance of a magnesian calcite.
“This is confirmed by XRD data (fig.7, top), which indicate appearance of a magnesian calcite.”
Quote in the paperSubstantial claim - Findingown data
The apparent composition of the magnesian calcite is Mg0.15Ca0.85CO3, calculated from observed d-spacing of 2.992 Å.
“An apparent composition of Mg 0.15 Ca 0.85 CO 3 is calculated from the observed d-spacing of 2.992 Å.”
Quote in the paperNot a substantial claim - Findingown data
Discrete heteronuclei formation requires supersaturations of log(Ω−1) ≥ 2.
“whereas formation of discrete heteronuclei as seen in figure 5 requires significantly higher supersaturation.”
- Also stated in: § RELEVANCE OF EXPERIMENTAL RESULTS TO NATURAL CARBONATE MINERALS · plain
“with evidence of distinct heteronuclei only observed at supersaturations of log (⍀ Ϫ 1) տ 2.”
Quote in the paperSubstantial claim - Also stated in: § RELEVANCE OF EXPERIMENTAL RESULTS TO NATURAL CARBONATE MINERALS · plain
- Findingown data
Figure 5 shows newly forming skeletal crystals whose orientation bears an obvious crystallographic relationship to the underlying substrate seed material.
“Figure 5 clearly shows newly forming ''skeletal'' crystals whose orientation bears an obvious crystallographic relationship to the underlying substrate seed material.”
Quote in the paperNot a substantial claim - Findingown data
BET areas were generally higher than geometric areas for reacted samples from runs Ti08, Ti09, and Ti10.
“BET areas were generally higher than geometric areas for reacted samples from runs Ti08, Ti09, and Ti10.”
Quote in the paperSubstantial claim - Findingown data
The activation energy value is ~10 kcal mol−1 less than the estimate obtained from Gaines (1968).
“This value is ϳ10 kcal mol Ϫ1 less than the estimate obtained from Gaines (1968).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Gaines (1968)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Findingown data
Magnesite and magnesian calcite formed, often as intergrowths in intimate contact with new dolomite surfaces.
“Otherphases, including magnesite and magnesian calcite, also formed, often as intergrowths in intimate contact with new dolomite surfaces.”
Quote in the paperSubstantial claim - Findingown data
The nucleation and growth of calcite typically arrested or at least severely diminished the rate of dolomite precipitation.
“On the contrary, the nucleation and growth of calcite typically arrested or at least severely diminished the rate of dolomite precipitation.”
Quote in the paperSubstantial claim - Findingown data
No significant differences were found between reacted and unreacted seed materials in the position or contour of the 510146 diffraction peak.
“No significant differences were found between reacted and unreacted seed materials in the position or contour of the 510146 diffraction peak.”
Quote in the paperNot a substantial claim - Findingown data
Syntaxial growth on existing surfaces can be sustained at low supersaturations, often with little or no induction period.
“the fact that syntaxial growth could be sustained at low overall saturation index, often with little or no ''induction period,'' is relevant to the growth of both synthetic and natural dolomite.”
- Also stated in: § RELEVANCE OF EXPERIMENTAL RESULTS TO NATURAL CARBONATE MINERALS · hedged
“the data presented in this work imply that syntaxial growth on existing surfaces can be sustained at low supersaturations”
Quote in the paperSubstantial claim - Also stated in: § RELEVANCE OF EXPERIMENTAL RESULTS TO NATURAL CARBONATE MINERALS · hedged
- Findingown data
Precipitation rates measured at 196°/176°C give an activation energy for the overall precipitation reaction of 31.9 ± 1.6 kcal mol−1.
“Precipitation rates measured at 196°/176°C give an activation energy for the overall precipitation reaction of 31.9Ϯ 1.6 kcal mol Ϫ1 .”
- Also stated in: § CONCLUSIONS · plain
“Selective fitting of rate data gives values for activation energy (⑀ A ), pre-exponential frequency factor (A), and reaction order (n) of 31.9 kcal mol Ϫ1 , 10 1.05 , and 2.26, respectively.”
Quote in the paperSubstantial claim - Also stated in: § CONCLUSIONS · plain
- Findingown data
Magnesian calcite formed at very low (pure calcite) supersaturation.
“Magnesian calcite formed at very low (pure calcite) supersaturation.”
Quote in the paperNot a substantial claim - Findingown data
The relationships expressed in figure 12 confirm the original working hypothesis that dolomite precipitation rate is a positive function of the distance from equilibrium.
“The relationships expressed in figure 12 do confirm our original working hypothesis (Arvidson and Mackenzie, 1997) that dolomite precipitation rate is a positive function of the distance from equilibrium.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson and Mackenzie, 1997 source
- Findingown data
The strong sensitivity of the model rate is shown through the change in rate constant extrapolated to 25°C, which varies inversely by ~0.3 log units per kcal of activation energy.
“The strong sensitivity of the model rate is clearly shown through the change in the rate constant extrapolated to 25°C, which varies inversely by ϳ0.3 log units per kcal of activation energy.”
Quote in the paperSubstantial claim - Findingown data
Growth at lower degrees of supersaturation occurs as layers in apparent syntaxial continuity with the original grain surface.
“Growth at lower degrees of supersaturation occurs as layers in apparent syntaxial continuity with the original grain surface.”
Quote in the paperSubstantial claim - Findingown data
Inclusion of data only from early, high supersaturation experiments using geometric area estimates results in an overall reaction order of 2.26 and frequency factor log A of 1.05.
“Inclusion of data only from early, high supersaturation experiments using geometric area estimates results in an overall reaction order of 2.26 and frequency factor log A of 1.05.”
Quote in the paperNot a substantial claim - Findingown data
There is no indication, from reacted fluid history or surface analysis, that magnesian calcite acts as a precursor to dolomite growth in these experiments.
“However, there is no indication, either from reacted fluid history of surface analysis, that magnesian calcite acts as any kind of precursor to dolomite growth in these experiments.”
- Also stated in: § CONCLUSIONS · hedged
“In contrast with the common perception, no evidence could be found that magnesian calcite acts as a reactive intermediate.”
Quote in the paperSubstantial claim - Also stated in: § CONCLUSIONS · hedged
- Findingown data
The activation energy of this calcite phase is <12 kcal mol−1.
“The activation energy of this calcite phase, based on figure 11, would be Ͻ12 kcal mol Ϫ1 .”
Quote in the paperNot a substantial claim - Findingcitation
Comparison with Gaines (1968) shows an increase of ~11 kcal mol−1 over the linear value.
“Comparison with the energy calculated for relatively well-ordered dolomites synthesized by Gaines (1968) shows an increase of ϳ11 kcal mol Ϫ1 over the linear value.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Gaines (1968)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Findingown data
SEM images of these samples showed large enhancements of surface area through development of growth features.
“SEM images of these samples also showed large enhancements of surface area through development of growth features.”
Quote in the paperNot a substantial claim - Findingown data
Experiments designed to measure dolomite precipitation rate over a range of temperature and solution composition have yielded model parameters for a reaction rate law having a simple dependence on saturation index.
“In summary, experiments designed to measure dolomite precipitation rate over a range of temperature and solution composition have yielded model parameters for a reaction rate law having a simple dependence on saturation index.”
Quote in the paperSubstantial claim - Findingown data
In experiments where growth of both phases could be monitored, calcite formed essentially at the expense of coprecipitating dolomite.
“those experiments in which growth of both phases could be monitored showed calcite to form essentially at the expense of coprecipitating dolomite.”
Quote in the paperSubstantial claim - Findingown data
The rate of dolomite precipitation, measured in a steady-state dolomite-seeded reflux reactor over a range of temperatures at fixed bulk composition and at variable composition and temperature, is a strong function of temperature and solution composition.
“The rate of dolomite precipitation, measured in a steady-state dolomite-seeded reflux reactor over a range of temperatures at fixed bulk composition and at variable composition and temperature, is shown to be a strong function of temperature and solution composition.”
Quote in the paperSubstantial claim - Findingown data
Magnesite was observed at bulk magnesium to calcium ratios similar to seawater, forming small, subhedral rhombic crystals.
“Magnesite was also observed at bulk magnesium to calcium ratios similar to seawater, forming small, subhedral rhombic crystals.”
Quote in the paperNot a substantial claim - Findingreasoning
The rate constant at 25°C is 10−22.3.
“This yields a rate constant at 25°C of 10 Ϫ22.3 .”
Quote in the paperSubstantial claim - Findingown data
SEM/EDS analysis of growth textures shows fine-scale intergrowths of calcite and dolomite layers in apparent crystallographic continuity.
“SEM/EDS analysis of growth textures show fine-scale intergrowths of calcite and dolomite layers in apparent crystallographic continuity”
Quote in the paperSubstantial claim - Findingown data
The style of growth varies according to the extent of supersaturation, with lower supersaturation promoting simple migration of surface steps and kinks.
“The style of growth varies according to the extent of supersaturation, with lower supersaturation promoting simple migration of surface steps and kinks.”
Quote in the paperSubstantial claim - Findingnone given
These particles appear to accrete in patterns apparently controlled by the crystallography of the underlying substrate.
“These particles appear to accrete in patterns apparently controlled by the crystallography of the underlying substrate.”
Quote in the paperNot a substantial claim - Findingown data
Higher supersaturations are associated with the development of complex nucleation centers consisting of submicron-sized nuclei.
“Higher supersaturations are associated with the development of complex nucleation centers consisting of submicron-sized nuclei.”
Quote in the paperSubstantial claim - Findingnone given
Calcite appears to nucleate rapidly given even slight oversaturation.
“Calcite appears to nucleate rapidly given even slight oversaturation”
Quote in the paperSubstantial claim - Findingown data
The effective dolomite precipitation rate is maximized when there is no competition from other carbonate phases, principally magnesian calcite.
“The effective dolomite precipitation rate is maximized when there is no competition from other carbonate phases, in this case principally magnesian calcite.”
Quote in the paperSubstantial claim - Findingown data
In the higher supersaturation case, growth appears to proceed by the agglomeration of small nuclei to form larger crystals.
“In the latter case, growth appears to proceed by the agglomeration of small nuclei to form larger crystals.”
Quote in the paperNot a substantial claim - Findingnone given
Growth textures observed in these experiments resemble those in published experiments for calcite precipitation on seed crystals.
“Growth textures observed in these experiments resemble those in published experiments for calcite precipitation on seed crystals.”
Quote in the paperNot a substantial claim - Findingown data
Growth textures observed in these experiments suggest syntaxial growth through aggradation of existing steps dominates at lower supersaturations.
“Growth textures observed in these experiments suggest syntaxial growth through aggradation of existing steps dominates at lower supersaturations”
Quote in the paperSubstantial claim - Findingown data
The overall rate constant at 25°C shows a dependence of ~0.3 log units per kcal on activation energy.
“The overall rate constant at 25°C shows a dependence of ϳ0.3 log units per kcal.”
Quote in the paperSubstantial claim - Findingown data
Selective fitting of rate data yields a pre-exponential frequency term of 1.05 (log10 units).
“Selective fitting of rate data yields an overall reaction order of 2.26 and a pre-exponential frequency term of 1.05 (log 10 units).”
- Also stated in: § CONCLUSIONS · plain
“Selective fitting of rate data gives values for activation energy (⑀ A ), pre-exponential frequency factor (A), and reaction order (n) of 31.9 kcal mol Ϫ1 , 10 1.05 , and 2.26, respectively.”
Quote in the paperSubstantial claim - Also stated in: § CONCLUSIONS · plain
- Findingown data
The composition of the dolomite forming in these experiments, calculated from solution mass balance and EDS spectroscopy of growth surfaces, is calcium-rich, with values typically between 55 and 58 mol percent CaCO3.
“The composition of the dolomite forming in these experiments calculated from solution mass balance and EDS spectroscopy of growth surfaces is calcium-rich, with values typically between 55 and 58 mol percent CaCO 3 .”
Quote in the paperSubstantial claim - Findingown data
Selective fitting of rate data yields an overall reaction order of 2.26.
“Selective fitting of rate data yields an overall reaction order of 2.26 and a pre-exponential frequency term of 1.05 (log 10 units).”
- Also stated in: § CONCLUSIONS · plain
“Selective fitting of rate data gives values for activation energy (⑀ A ), pre-exponential frequency factor (A), and reaction order (n) of 31.9 kcal mol Ϫ1 , 10 1.05 , and 2.26, respectively.”
Quote in the paperSubstantial claim - Also stated in: § CONCLUSIONS · plain
- Premisenone given
Data available from the literature suggest that dolomites synthesized at temperatures less than approximately 200°C are often calcium-rich and imperfectly ordered.
“Data available from the literature suggest that dolomites synthesized at temperatures less than ϳ200°C are often calcium-rich and imperfectly ordered.”
Quote in the paperSubstantial claim - Interpretationnone given
The total duration of laboratory synthesis experiments is still very short compared to the age of Recent dolomite forming in the Abu Dhabi sabkha or the Coorong lagoons.
“the total duration of such experiments is still very short compared to the age of Recent dolomite forming, for example, in the Abu Dhabi sabkha of the Persian Gulf or the Coorong lagoons of South Australia.”
Quote in the paperSubstantial claim - Premisecitation
Patient experimentalists have not succeeded in synthesizing dolomite at room temperature.
“although patient experimentalists have not succeeded in synthesizing dolomite at room temperature (Land, 1998)”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Land, 1998
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Premisecitation
Peterson, Bien, and Berner (1963) derived a linear growth rate of approximately 0.5 Å y−1 from 14C ages of size fractions of dolomite crystals from Deep Spring Lake, California.
“Peterson, Bien, and Berner (1963) derived a linear growth rate of ϳ0.5 Åy Ϫ1 from the 14 C ages of size fractions of dolomite crystals taken from muds of Deep Spring Lake, California.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Peterson, Bien, and Berner (1963) source
- Interpretationown data
The results of our experiments suggest that laboratory synthesis of dolomite at approximately 25°C is probably not feasible.
“In fact, the results of our experiments suggest that laboratory synthesis of dolomite at ϳ25°C is probably not feasible.”
Quote in the paperSubstantial claim- The authors state this as an assumption: The precipitation rate of dolomite can be described by a rate law of the form r = k(Ω − 1)^n.
- The authors state this as an assumption: The rate constant k has an Arrhenius form.
- Interpretationreasoning
The slow rate derived by Peterson et al. contrasts greatly with the observed size of Holocene dolomite crystals forming in the Florida Keys, the Persian Gulf, and the Coorong of South Australia.
“This result is in great contrast with the observed size of Holocene dolomite crystals forming, for example, in the Florida Keys (Carballo, Land, and Miser, 1987), the Persian Gulf (Baltzer and others, 1994), and the Coorong (von der Borch, Rubin, and Skinner, 1964) of South Australia.”
Quote in the paperSubstantial claim0 of 3 sources checked - Interpretationown data
The experimental findings suggest that the abundance of dolomite in the sedimentary rock record reflects, at least in part, environmental changes in temperature and seawater chemistry over geologic time.
“The experimental findings of this paper suggest that the abundance of dolomite in the sedimentary rock record reflects, at least in part, environmental changes in temperature and seawater chemistry over geologic time.”
Quote in the paperSubstantial claim- The authors state this as an assumption: The precipitation rate of dolomite can be described by a rate law of the form r = k(Ω − 1)^n.
- The authors state this as an assumption: The rate constant k has an Arrhenius form.
- Interpretationreasoning
The calculated value of 31.9 kcal mol−1 most likely represents a minimum value.
“Thus the calculated value of 31.9 kcal mol Ϫ1 most likely represents a minimum value.”
Quote in the paperSubstantial claim - Premisecitation
All end phase dolomites produced from 252° to 295°C in Katz and Matthews (1997) are essentially stoichiometric, with only ~±1 percent excess calcium or magnesium.
“For example, all end phase dolomites produced from 252° to 295°C in Katz and Matthews (1997) are essentially stoichiometric, with only ϳ Ϯ1 percent excess calcium or magnesium.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Katz and Matthews (1997)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Study design and conductreasoning
The derived parameters in the rate equation have nontrivial errors that are difficult to quantify.
“These uncertainties clearly endow the derived parameters in the rate equation with nontrivial errors that are difficult to quantify.”
Quote in the paperNot a substantial claim - Interpretationreasoning
The fact that no differences were noted in 2θ position or in height or width of principal superstructure reflections between reacted and unreacted samples is not conclusive.
“Thus the fact that no differences were noted either in 2⌰ position or in the height or width of these peaks between reacted and unreacted samples is not conclusive.”
Quote in the paperSubstantial claim - Study design and conductown data
The increasing error in apparent stoichiometry with decreasing temperature makes it difficult to discern any significant changes in stoichiometry with temperature from our data.
“The increasing error in the apparent stoichiometry with decreasing temperature (fig.8, bottom left) makes it difficult to discern any significant changes in stoichiometry with temperature from our data.”
Quote in the paperSubstantial claim - Study design and conductown data
The composition of unreacted seed materials was determined by extensive EDS analysis and indicated a very homogeneous and essentially perfect 1:1 ratio of Ca to Mg.
“The composition of unreacted seed materials was determined by extensive EDS analysis and indicated a very homogeneous and essentially perfect 1:1 ratio of Ca to Mg.”
Quote in the paperNot a substantial claim - Interpretationreasoning
If dolomite growth is viewed as constructing alternating layers of calcite and magnesite, then the rate of dolomite growth may be essentially limited by that of the magnesite layer.
“If dolomite growth is viewed as a process of constructing alternating layers of calcite and magnesite, then the rate of dolomite growth may be essentially limited by that of the ''magnesite'' layer.”
Quote in the paperSubstantial claim- The authors state this as an assumption: Dolomite growth can be viewed as a process of constructing alternating layers of calcite and magnesite.
- Study design and conductreasoning
It is not possible to calculate satisfactorily an error estimate for either of the other two activation energy numbers.
“Furthermore it is not possible to calculate satisfactorily an error estimate for either of the other two numbers”
Quote in the paperNot a substantial claim - Interpretationcitation
The reduction in activation energy with increase in excess calcium content must be ultimately related to differences in energy requirements of dehydrating calcium versus magnesium ion prior to incorporation within the growing dolomite lattice.
“The reduction in activation energy with increase in excess calcium content must be ultimately related to the differences in energy requirements of dehydrating calcium versus magnesium ion prior to incorporation within the growing dolomite lattice.”
Quote in the paperSubstantial claim - Study design and conductown data
The presence of strong and well-defined principal superstructure reflections in the seed material indicated a well-ordered dolomite phase.
“The presence of strong and well-defined principal superstructure reflections in the seed material indicated a well-ordered dolomite phase.”
Quote in the paperNot a substantial claim - Interpretationcitation
In equivalently supersaturated solutions, the log ratio of calcite to magnesite rates is ~10 at 25°C.
“In equivalently supersaturated solutions, this number is ϳ10 at 25°C.”
Quote in the paperSubstantial claim - Interpretationreasoning
The very large difference in estimated rates is reflected in the distribution of magnesite in modern surface environments, whose scarcity rivals that of dolomite.
“This very large difference in estimated rates is reflected in the distribution of magnesite in modern surface environments, whose scarcity rivals that of dolomite.”
Quote in the paperNot a substantial claim - Interpretationreasoning
Dolomite precipitation is a slow reaction at low temperature under most conditions.
“dolomite precipitation is indeed a slow reaction at low temperature under most conditions”
Quote in the paperSubstantial claim - Interpretationreasoning
Because of the high ratio of solid surface area to solution, changes in reaction rate also have an effect on solution chemistry.
“Third, because of the high ratio of solid surface area to solution, changes in reaction rate also have an effect on solution chemistry.”
Quote in the paperSubstantial claim - Study design and conductown data
The errors attending the analyses and their contribution to the calculation of the rate represented by a given sample are relatively small.
“The errors attending these analyses and thus their contribution to the calculation of the rate represented by a given sample are relatively small (table 1).”
Quote in the paperNot a substantial claim - Interpretationown data
The sum of standard state chemical potentials for the dolomite precipitation reaction will change directly and indirectly as aqueous species redistribute themselves.
“First, the sum of the standard state chemical potentials for the dolomite precipitation reaction will change directly and indirectly as aqueous species redistribute themselves.”
Quote in the paperSubstantial claim - Interpretationown data
Based on fluid chemistry data alone, the phases produced tend to be richer in calcium compared with those produced in earlier published experiments at higher temperatures.
“However, based on fluid chemistry data alone, the phases produced also tend to be richer in calcium compared with those produced in earlier published experiments at higher temperatures.”
Quote in the paperNot a substantial claim - Interpretationreasoning
The discrepancies in activation energy more likely reflect differences in composition and cation ordering of the dolomite phase.
“More likely, however, the discrepancies in energy reflect differences in the composition and cation ordering of the dolomite phase.”
Quote in the paperSubstantial claim - Interpretationown data
The XRD result only indicates that the product phase is compositionally indistinguishable from stoichiometric dolomite.
“However, this result only indicates that the product phase is compositionally indistinguishable from stoichiometric dolomite.”
Quote in the paperSubstantial claim - Premisecitation
Lippmann (1973) estimated the activation energy for magnesite growth to be 12.8 kcal mol−1 greater than that for calcite.
“Lippmann (1973), using hydration enthalpy data from Noyes (1962) and a model for the electrostatic energy of the ion-dipole bond as a function of ionic radius and dipole moment, estimated the activation energy for magnesite growth to be 12.8 kcal mol Ϫ1 greater than that for calcite.”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Lippmann (1973)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Noyes (1962) source
- Interpretationown data
Given extrapolated rates of dolomite precipitation at 25°C or lower, it is doubtful that any experiments conducted at these temperatures, outside those capable of atomic scale resolution, will be able to observe dolomite formation directly on laboratory time scales.
“Given the extrapolated rates of dolomite precipitation at 25°C or lower, it is doubtful that any experiments conducted at these temperatures, outside those capable of atomic scale resolution, will be able to observe dolomite formation directly on laboratory time scales.”
Quote in the paperSubstantial claim - Interpretationreasoning
This difference probably reflects the energy of (partial) ordering.
“This difference probably reflects the energy of (partial) ordering.”
Quote in the paperSubstantial claim - Interpretationcitation
Using the difference of 12.8 kcal mol−1 computed by Lippmann (1973) yields a theoretical value of 22.2 kcal mol−1 for magnesite.
“Using the difference of 12.8 kcal mol Ϫ1 computed by Lippmann (1973) yields a theoretical value of 22.2 kcal mol Ϫ1 for magnesite.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Lippmann (1973)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Premisecitation
Previous experimental work has focused almost exclusively on the conversion of calcite to dolomite (recrystallization).
“Previous experimental work has focused almost exclusively on the conversion of calcite to dolomite (that is, ''recrystallization'').”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson, 1998
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Interpretationcitation
The distance from equilibrium of the phase undergoing precipitation should vary according to its composition.
“Thus the ''distance'' from equilibrium of the phase undergoing precipitation should vary according to its composition.”
Quote in the paperSubstantial claim - Premisecitation
The enthalpy data of Chai, Navrotsky, and Reeder (1995) suggests that solubility is a very strong function of the extent of calcium substitution.
“The enthalpy data of Chai, Navrotsky, and Reeder (1995) suggests that solubility is a very strong function of the extent of calcium substitution.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Chai, Navrotsky, and Reeder (1995) source
- Interpretationreasoning
Rather specific conditions must persist in order for dolomite to dominate in terms of mineral distributions.
“The observation that dolomite competes poorly with metastable magnesian calcite, at least under the conditions of these experiments, implies that rather specific conditions must persist in order for dolomite to dominate in terms of mineral distributions.”
Quote in the paperSubstantial claim - Premisecitation
The activation energy for calcite is 9.4 ± 0.9 kcal mol−1.
“The activation energy for calcite is relatively well known, and we have used the value of 9.4 Ϯ 0.9 kcal mol Ϫ1 from Kazmierczak, Tomson, and Nancollas (1982).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Kazmierczak, Tomson, and Nancollas (1982) source
- Premisecitation
The activation energy associated with the ordering reaction is in at least qualitative agreement with values ranging from 8 to 11 kcal mol−1 computed from Malone, Baker, and Burns (1996).
“This activation energy associated with the ordering reaction is in at least qualitative agreement with values ranging from 8 to 11 kcal mol Ϫ1 computed using data from Malone, Baker, and Burns (1996) for the rate of recrystallization of disordered Ca-Mg carbonate starting materials to ordered phases over the temperature range 98° to 197°C.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Malone, Baker, and Burns (1996) source
- Interpretationreasoning
If at a given temperature dehydration of calcium requires less energy than magnesium, calcium may become incorporated in its stead despite its destabilizing influence on the bulk solid.
“If, at a given temperature, dehydration of calcium requires less energy than magnesium, calcium may become incorporated in its stead in spite of its overall destabilizing influence on the bulk solid.”
Quote in the paperSubstantial claim- The authors state this as an assumption: At a given temperature, dehydration of calcium requires less energy than magnesium.
- Interpretationreasoning
The rate appearing in table 5 probably represents a minimum value because it was computed by assigning the total surface area to dolomite precipitation.
“Therefore the rate appearing in table 5 probably represents a minimum value, because it was computed by assigning the total surface area to dolomite precipitation.”
Quote in the paperNot a substantial claim - Interpretationreasoning
The activation energy observed for the dolomite phase formed in this experiment is slightly higher than that predicted by assuming magnesium dehydration to be the controlling step.
“It is apparent that the activation energy observed for the dolomite phase formed in this experiment is slightly higher than that predicted by assuming magnesium dehydration to be the controlling step.”
Quote in the paperSubstantial claim- The authors state this as an assumption: Magnesium dehydration is the controlling step for the activation energy of the dolomite phase formed in this experiment.
- Interpretationreasoning
The greater ease of calcium versus magnesium incorporation at this step is reflected in a reduction in activation energy for the dolomite crystal.
“The greater ease of calcium versus magnesium incorporation at this step is thus reflected in a reduction in activation energy for the dolomite crystal.”
Quote in the paperSubstantial claim - Premisecitation
The difficulty in forming dolomite at sedimentary temperatures in conversion experiments is a large part of the original dolomite problem.
“The difficulty in forming dolomite at sedimentary temperatures in this type of experiment is a large part of the original dolomite problem (Arvidson, 1998).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson, 1998
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Premisecitation
The initial precipitate in many sedimentary minerals is typically imperfect with respect to order and contaminants.
“In addition, the initial precipitate in many sedimentary minerals is typically imperfect with respect to order and contaminants: the magnesian calcites themselves are excellent examples, containing excess water, sodium, sulfate, and bicarbonate, and surface defects, in addition to anion positional disorder introduced by magnesium substitution (Busenberg and Plummer, 1986;Mackenzie and others, 1983”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Busenberg and Plummer, 1986
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Mackenzie and others, 1983
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Morse and Mackenzie, 1990
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Interpretationreasoning
The phases developed as heteronuclei on the surface of the dolomite substrate should have reduced the surface available for dolomite growth.
“These phases, developed as heteronuclei on the surface of the dolomite substrate, should have had the effect of reducing the surface available for dolomite growth.”
Quote in the paperSubstantial claim - Premisenone given
Positive contributions to free energy are lost during subsequent episodes of recrystallization during diagenesis, resulting in the formation of a stable, low-magnesium calcite.
“These positive contributions to free energy are lost during subsequent episodes of recrystallization during diagenesis, resulting in the formation of a stable, low-magnesium calcite.”
Quote in the paperNot a substantial claim - Premisecitation
Case studies of natural dolomite precipitation in Arvidson and Mackenzie (1997) support the observation that dolomite currently forming in low temperature environments responds strongly to increases in carbonate alkalinity, supplied either by aragonite dissolution or bicarbonate production during sulfate reduction.
“The case studies of natural dolomite precipitation presented in Arvidson and Mackenzie (1997) support the observation that dolomite currently forming in low temperature environments responds strongly to increases in carbonate alkalinity, supplied either by aragonite dissolution or bicarbonate production during sulfate reduction.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Arvidson and Mackenzie (1997) source
- Interpretationreasoning
As the temperature dependence of the rate (measured at high temperatures) increases, the extrapolated value of the rate at earth surface temperatures decreases dramatically.
“Thus as the temperature dependence of the rate (measured at high temperatures) increases, the extrapolated value of the rate at earth surface temperatures decreases dramatically.”
Quote in the paperSubstantial claim - Interpretationcitation
This style of growth, in which larger crystals form as aggregates of small nuclei, appears quite similar to that described by Carballo, Land, and Miser (1987) in supratidal dolomite forming in contact with little-modified seawater.
“This style of growth, in which larger crystals form as aggregates of small nuclei, appears quite similar to that described by Carballo, Land, and Miser (1987) in supratidal dolomite forming in contact with little-modified seawater”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Carballo, Land, and Miser (1987) source
- Interpretationreasoning
The times estimated for 25°C reactions (10^1 to 10^2 yrs) suggest that direct laboratory observation under these conditions is infeasible.
“The times estimated for 25°C reactions (10 1 to 10 2 yrs) suggest that direct laboratory observation under these conditions is infeasible.”
Quote in the paperSubstantial claim - Interpretationown data
In a closed system, the rate law predicted that hundreds of years of laboratory observation would be required to detect precipitation of sufficient dolomite to give 10 percent of original mass of seed material.
“In a closed system, the rate law in its current form predicted that hundreds of years of laboratory observation would be required to detect this extent of reaction.”
Quote in the paperSubstantial claim - Interpretationreasoning
The transitions in mechanism predicted from classical nucleation and crystal growth theory can also be applied to dolomite.
“Thus it is likely that the transitions in mechanism predicted from classical nucleation and crystal growth theory (for example, growth via screw dislocation, growth rate proportional to defect density), perhaps not surprisingly, can also be applied to dolomite, assuming that sufficient measurements are feasible.”
Quote in the paperNot a substantial claim- The authors state this as an assumption: Sufficient measurements are feasible to apply classical nucleation and crystal growth theory to dolomite.
- Interpretationnone given
These textures also resemble those observed in low temperature natural dolomites developing in supratidal sediments in contact with pore fluids of near-marine composition.
“These textures also resemble those observed in low temperature natural dolomites developing in supratidal sediments in contact with pore fluids of near-marine composition.”
Quote in the paperNot a substantial claim - Interpretationown data
The overall low rate of dolomite precipitation relative to competing carbonate phases at surface temperatures determines dolomite's abundance in a sedimentary regime.
“The strong dependence on temperature and saturation state observed in these experiments suggests that it is the overall low rate of dolomite precipitation relative to competing carbonate phases at surface temperatures that determines dolomite's abundance in a sedimentary regime.”
Quote in the paperSubstantial claim - Interpretationreasoning
Mg2+ dehydration represents a significant component of the activation energy.
“This comparison suggests that Mg 2ϩ dehydration represents a significant component of ⑀ A ; an activation energy associated with cation ordering was estimated at ϳ10 kcal mol Ϫ1 .”
Quote in the paperSubstantial claim - Interpretationreasoning
Small increases in temperature would yield significant increases in dolomite precipitation rate relative to calcite, particularly where calcite is minimally supersaturated or undersaturated.
“Consideration of the relationship between dolomite and calcite in terms of activation energies also suggests, however, that small increases in temperature would yield significant increases in dolomite precipitation rate relative to calcite, particularly in cases where calcite is either minimally supersaturated or undersaturated.”
Quote in the paperSubstantial claim - Interpretationreasoning
The combination of high activation energy and relatively high order yields a reaction that is strongly sensitive to changes in both temperature and saturation state.
“The combination of high activation energy and relatively high order yield a reaction that is strongly sensitive to changes in both temperature and saturation state.”
Quote in the paperSubstantial claim - Interpretationreasoning
An activation energy associated with cation ordering was estimated at ~10 kcal mol−1.
“This comparison suggests that Mg 2ϩ dehydration represents a significant component of ⑀ A ; an activation energy associated with cation ordering was estimated at ϳ10 kcal mol Ϫ1 .”
Quote in the paperSubstantial claim
- May combine two claims. 39
- Classified as probably not a substantial claim. 41
- The quote only partly states this claim. 1
May combine two claims.
Findingown dataThe dolomite produced in these experiments was variable in composition but typically a calcium-rich protodolomite, forming syntaxial overgrowths on the seed material.
“The dolomite produced in these experiments was variable in composition but typically a calcium-rich protodolomite, forming syntaxial overgrowths on the seed material.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). The quote only partly states this claim.
Findingown dataDolomite heteronuclei were somewhat more calcium-rich, having between 53.2 and 58.5 percent CaCO3.
“Dolomite heteronuclei were somewhat more calcium-rich, having between 53.2 to 58.5 percent”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataBackscatter SEM shows some contrast between newly crystallizing dolomite and magnesian calcite, allowing the two phases to be distinguished.
“Backscatter SEM also shows some contrast between newly crystallizing dolomite and magnesian calcite, allowing the two phases to be distinguished (fig.5, top row).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataRun Ti01 is the only experiment in which magnesite developed, and magnesite was observed only epitaxially, not in apparent crystallographic continuity either with the dolomite substrate or dolomite phase overgrowths thereof.
“This experiment (run Ti01) is the only one in which magnesite developed, and magnesite was observed only epitaxially, that is, not in apparent crystallographic continuity either with the dolomite substrate or dolomite phase overgrowths thereof.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataSEM/EDS analysis indicated these flecks to be μm-sized particles of Fe, Ni, or Cr, probably contributed from the preheater tubing loop.
“SEM/EDS analysis indicated these to be µm-sized particles of Fe, Ni, or Cr, probably contributed from the preheater tubing loop.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataDolomite heteronuclei were somewhat more calcium-rich, with CaCO3 compositions between 53.2 and 58.5%, and some spot analyses slightly greater than 60% CaCO3.
“Dolomite heteronuclei were somewhat more calcium-rich, having between 53.2 to 58.5 percent CaCO 3 , with some spot analyses encountering compositions slightly greater than 60 percent CaCO 3 .”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Findingown dataSyntaxial overgrowth of the substrate in run Ti01 was visible as the infilling of etch pits and the formation of a bumpy, irregular surface, compositionally indistinguishable under EDS from unreacted substrate material.
“Syntaxial overgrowth of the substrate in this run was visible as the infilling of etch pits and the formation of a bumpy, irregular surface, compositionally indistinguishable under EDS from unreacted substrate material.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe run at 170°C shows an incremental uptake of calcium and magnesium, but total alkalinity data indicate dissolution at this temperature.
“The run at 170°C shows an incremental uptake of calcium and magnesium; however, the total alkalinity data indicate dissolution at this temperature.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Findingown dataThese inclusions were not observed in reacted grains and presumably dissolved during reaction.
“These inclusions were not observed in reacted grains and presumably dissolved during reaction.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingnone givenSyntaxial growth of new dolomite predominates in all samples except those reacted at high supersaturation, where it is also accompanied by coprecipitated phases (magnesian calcite and magnesite).
“Syntaxial growth of new dolomite predominates in all samples except those reacted at high supersaturation, where it is also accompanied by coprecipitated phases (magnesian calcite and magnesite).”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataGrowth was most commonly developed as thinly aggregated terraces.
“Growth was most commonly developed as thinly aggregated terraces (fig.3, top row).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataSamples retrieved after lengthy reaction times at high temperatures were also typically discolored with small flecks of material.
“Samples retrieved after lengthy reaction times at high temperatures were also typically discolored with small flecks of material.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataAcid washing prior to reaction resulted in dissolution in the form of rounding of interfacial angles, subhedral boundaries, and development of etch pits.
“Acid washing prior to reaction resulted in dissolution in the form of rounding of interfacial angles, subhedral boundaries, and development of etch pits (fig.2).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataSEM imaging also indicated a trace contribution of Fe and Mn in the form of oxide and silicate inclusions.
“SEM imaging also indicated a trace contribution of Fe and Mn in the form of oxide and silicate inclusions.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataAt high supersaturations, larger rhombic crystals form via aggregation of submicro-sized nuclei, in addition to possible secondary nuclei forming on the seed surface.
“At high supersaturations, in addition to what may be secondary nuclei forming on the seed surface, larger rhombic crystals form via the aggregation of submicro-sized nuclei.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataThese data show that log rate is a strong function of saturation index, which in turn mostly reflects the change in carbonate ion availability.
“This effect is at least partly borne out by these data, in which the log ratefoot_3 is a strong function of saturation index, which in turn mostly reflects the change in carbonate ion availability.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataSpot EDS analyses of new dolomite from run Ti10 (170°-196°C) show it to be calcium-rich in composition, in agreement with fluid chemistry data.
“Spot EDS analyses of what is clearly new dolomite to run Ti10 (170°-196°C, fig. 3) do show it to be calcium-rich in composition, in agreement with the fluid chemistry data.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Findingown dataThe variation in EDS analyses suggests variability in surface composition, and the data were fairly reproducible.
“The variation in these EDS analyses also suggests variability in the surface composition, and although part of this variability may be an artifact of the instrument's semi-quantitative resolution, the data were nonetheless fairly reproducible.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe dolomite overgrowths formed in these experiments are not simply magnesian calcites; ~15 mol percent magnesian calcite did form but is identifiable from XRD and SEM data as a distinct, although clearly metastable, phase.
“They are not simply magnesian calcites-ϳ15 mol percent magnesian calcite did form but is identifiable from XRD and SEM data as a distinct, although clearly metastable, phase.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataRegression of all data causes the order to diminish to 1.88 but increases the log frequency term to 2.09.
“Regression of all data (including those derived from the literature) causes the order to diminish to 1.88 but increases the log frequency term by more than an order of magnitude to 2.09.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataThe time required shortens considerably if starting concentration of MgCl2 is increased to 0.05 m; however, tens of years are still required at 25°C.
“The time required shortens considerably if the starting concentration of MgCl 2 is increased to 0.05 m; however, tens of years are still required at 25°C.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataNo distinct trends could be found in terms of evolution in composition of the newly precipitating solid, although the approach to a steady state reaction was variable in duration and direction.
“Although the approach to a steady state reaction was variable in duration and direction, no distinct trends could be found in terms of evolution in composition of the newly precipitating solid.”
Quote in the paperSubstantial claimMay combine two claims.
FindingreasoningThe growth of magnesian calcites (~15 mole percent MgCO3) where observed appears to outcompete dolomite for available dissolved components, and thus largely buffers dolomite precipitation subsequent to its appearance.
“The growth of magnesian calcites (ϳ15 mole percent MgCO 3 ) where observed appears to outcompete dolomite for available dissolved components, and thus largely buffers dolomite precipitation subsequent to its appearance.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationModern dolomite exists but is common only in certain environments: marginal, restricted, hypersaline regimes; nonmarine lakes; and zones of microbial sulfate reduction.
“Modern dolomite does indeed exist but is common only in certain environments: (1) marginal, restricted, hypersaline regimes such as the Coorong lakes of South Australia (Alderman, 1959), supratidal lagoons on the island of Bonaire, Netherland Antilles (Deffeyes, Lucia, and Weyl, 1965), and the sabkhas of the Persian Gulf (Wells, 1962)”
Quote in the paperSubstantial claim0 of 3 sources checked- cites Alderman, 1959
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Deffeyes, Lucia, and Weyl, 1965
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Wells, 1962 source
Classified as probably not a substantial claim.
PremisecitationArvidson and Mackenzie (1997) computed dolomite growth rates and solution saturation states from published dolomite synthesis experiments.
“In a preliminary effort to place the few laboratory data available into a meaningful framework, Arvidson and Mackenzie (1997) computed dolomite growth rates and solution saturation states from published dolomite synthesis experiments.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson and Mackenzie (1997) source
Classified as probably not a substantial claim.
PremisecitationThe relationship between dolomite growth rates and solution saturation states was expressed as a rate law consistent with the hypothesis that the rate of dolomite precipitation is a function of temperature and solution composition.
“The relationship between these two independent pieces of information was expressed as a rate law consistent with the hypothesis that the rate of dolomite precipitation is a function of temperature and solution composition.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson and Mackenzie (1997) source
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationMalone, Baker, and Burns (1996) observed that the rate of recrystallization of initially disordered (Ca,Mg)-carbonates was a strong function of temperature, and temperature increases produced corresponding increases in MgCO3 and cation ordering.
“In more recent work, Malone, Baker, and Burns (1996) observed that the rate of recrystallization of initially disordered (Ca,Mg)-carbonates was a strong function of temperature, and temperature increases produced corresponding increases in MgCO 3 and cation ordering.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Malone, Baker, and Burns (1996) source
May combine two claims.
InterpretationcitationThe rate derived by Peterson et al. is exceedingly slow, and dolomite crystals growing at this rate would require 200 Ma to acquire an edge length of 1 mm.
“This rate is exceedingly slow, and dolomite crystals growing at this rate would require 200 Ma to acquire an edge length of 1 mm.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationDolomite is found in environments ranging from the shallow subtidal to supratidal.
“Dolomite is also found in environments ranging from the shallow subtidal (Mazzullo, Bischoff, and Teal, 1995) to supratidal (Carballo, Land, and Miser, 1987).”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites Mazzullo, Bischoff, and Teal, 1995
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Carballo, Land, and Miser, 1987 source
Classified as probably not a substantial claim. May combine two claims.
PremisecitationRelatively modest increases in temperature and seawater saturation state could potentially give rise to large increases in the overall rate of dolomite precipitation and a substantial convergence of the relative rates of calcite and dolomite.
“We also concluded that relatively modest increases in temperature and seawater saturation state could potentially give rise to large increases in the overall rate of dolomite precipitation and a substantial convergence of the relative rates of calcite and dolomite.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson and Mackenzie (1997) source
Probably not a substantial claim: may not pass S4 (based).
Premisenone givenRates cannot be meaningfully compared without simultaneous measurement of prevailing physico-chemical conditions.
“In addition, rates cannot be meaningfully compared without simultaneous measurement of prevailing physico-chemical conditions.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationThese metastable calcium-rich, imperfectly ordered materials are distinct from magnesium calcite, which was the purpose of Graf and Goldsmith's (1956) original introduction of the term protodolomite.
“It should be emphasized that these materials, despite their metastability, are distinct from magnesium calcite, and this was the purpose of Graf and Goldsmith's (1956) original introduction of the term protodolomite.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Graf and Goldsmith's (1956) source
Classified as probably not a substantial claim.
PremisecitationPrecipitation rates computed from the Arvidson and Mackenzie model agreed closely with age estimates in case studies of sabkha and organogenic dolomite of Recent to Pleistocene age.
“Precipitation rates computed from this model agreed closely with age estimates in case studies of sabkha and organogenic dolomite of Recent to Pleistocene age.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson and Mackenzie (1997) source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationBrady, Krumhansl, and Papenguth (1996) concluded that dehydration and carbonation of magnesium was the most probable rate-limiting step at low temperatures.
“In adsorption experiments at room temperature and fixed pCO 2 , Brady, Krumhansl, and Papenguth (1996) concluded that dehydration and carbonation of magnesium was the most probable rate-limiting step at low temperatures.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Brady, Krumhansl, and Papenguth (1996) source
May combine two claims.
PremisecitationThe value of 31.9 kcal mol−1 is lower than the value of 42.1 kcal mol−1 obtained from Gaines (1968) and lower still than the published value of 49 kcal mol−1 from Katz and Matthews (1977).
“The value of 31.9 kcal mol Ϫ1 is also lower than the value of 42.1 kcal mol Ϫ1 obtained from an analysis of unpublished data from Gaines (1968, rates computed from 220° 250°C; see also Arvidson and Mackenzie, 1997) which in turn is lower still than the only published value of 49 kcal mol Ϫ1 , determined from rates at temperatures from 252° to 295°C by Katz and Matthews (1977).”
Quote in the paperNot a substantial claim0 of 3 sources checkedMay combine two claims.
PremisecitationGaines (1968) observed an increase in MgCO3 with increasing temperature (220°-250°C), and the same effect at fixed temperature (200 and 220°C) as the ratio of magnesium to calcium in solution was increased from 0.5 to 1.0.
“Gaines (1968) also observed an increase in MgCO 3 with increasing temperature (220°-250°C), although the same effect in his experiments could be observed at fixed temperature (200 and 220°C) as the ratio of magnesium to calcium in solution was increased from 0.5 to 1.0 (his table 2, p. 30).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Gaines (1968)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim: may not pass S3 (load-bearing).
Interpretationown dataThe alignment of magnesian calcite and dolomite rhombs suggests an underlying crystallographic control by the substrate.
“The alignment of magnesian calcite and dolomite rhombs suggests an underlying crystallographic control by the substrate.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenThe precision in total alkalinity measurements was often poorer (approximately 0.3 percent) than that of total divalent cations (<0.1 percent).
“Although the precision in total alkalinity measurements was often poorer (ϳ0.3 percent) than that of total divalent cations (Ͻ0.1 percent), most experiments were conducted in solutions whose total cation concentration was an order of magnitude greater than the total alkalinity.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningThe leverage from the greater total cation concentration often made total alkalinity the quantity of choice in rate calculations.
“This leverage often made total alkalinity the quantity of choice in rate calculations.”
Quote in the paperNot a substantial claimMay combine two claims.
Interpretationown dataPrecipitation of magnesian calcite can occur at the expense of dolomite and apparently can also drive dissolution of newly formed, soluble dolomite.
“which suggests that precipitation of magnesian calcite can occur at the expense of dolomite and apparently can also drive dissolution of newly formed, soluble dolomite.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationThe stoichiometry of recrystallized dolomite tends to improve with increasing temperature, and the composition of first-formed dolomite phases at any temperature tends to be richer in calcium compared to subsequent phases (50°-200°C).
“The stoichiometry of recrystallized dolomite also tends to improve with increasing temperature, and the composition of first-formed dolomite phases at any temperature tends to be richer in calcium compared to subsequent phases (50°-200°C, Malone, Baker, and Burns, 1996).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Malone, Baker, and Burns, 1996 source
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationreasoningIt is possible that the lower activation energy observed reflects a reduced energy barrier to forming calcian dolomites.
“It is thus possible that the lower activation energy observed reflects a reduced energy barrier to forming calcian dolomities.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim. May combine two claims.
Study design and conductnone givenThe reactor used in these experiments is similar in design to flow reactors used in solubility and kinetic studies of other minerals and is capable of measuring slow precipitation reactions at moderately elevated temperature and confining pressure.
“Thereactor used in these experiments is similar in design to flow reactors used in solubility and kinetic studies of other minerals and is capable of measuring slow precipitation reactions at moderately elevated temperature and confining pressure.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
InterpretationreasoningTo some extent the variability in the new dolomite phase could be related to the conditions of the experiment.
“To some extent this variability could be related to the conditions of the experiment, as described below.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataThere was no indication from surface imaging that these contaminants interfered with growth of new material.
“there was no indication from surface imaging that they interfered with growth of new material.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataICP-ES analysis of reacted solutions from a single run at 150°C could not detect these elements.
“ICP-ES analysis of reacted solutions from a single run at 150°C could not detect these elements.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningHad the reactor maintained a truly constant saturation index independent of temperature and reaction rate, measured rates at higher temperatures would most likely have been higher, giving a greater slope and higher computed activation energy.
“Had the reactor been capable of maintaining a truly constant saturation index independent of temperature and reaction rate, measured rates at the higher temperatures would most likely have been higher still, giving a greater slope in figure 9, and thus a higher computed activation energy.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationnone givenChanges in the dominant reaction mechanism with temperature may give rise to corresponding changes in activation energy, visible as changes in slope in figure 9.
“Last, changes in the dominant reaction mechanism with temperature may give rise to corresponding changes in activation energy, visible as changes in slope in figure 9.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataThese data agreed with additional EGTA/EDTA determinations of Ca and Mg in the seed dolomite.
“These data agreed with additional EGTA/ EDTA determinations of Ca and Mg in the seed dolomite.”
Quote in the paperNot a substantial claimMay combine two claims.
Interpretationown dataEnergies using divalent cation data yield substantially lower energies, larger uncertainties, and poorer fits and can be safely discarded because they are less than calcite on a per mole-CO3 basis.
“Energies using the divalent cation data yield substantially lower energies, larger uncertainties, and poorer fits and can be safely discarded on the basis that they are less than calcite (on a per mole-CO 3 basis).”
Quote in the paperSubstantial claimMay combine two claims.
InterpretationreasoningIncreases in rate due to temperature brought about increased consumption of reactants, which depressed the ion activity product and probably depressed the rate.
“Increases in the rate by virtue of temperature also brought about increased consumption of reactants, which in turn served to depress the ion activity product and in turn probably depressed the rate.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataThe computed d-spacing of the primary and secondary diffraction peaks agreed with the entry for ideal dolomite obtained from the JCPDF database to the precision of the instrument.
“The computed d-spacing of the primary 510146 1 and secondary diffraction peaks agreed with the entry for ideal dolomite obtained from the JCPDF database to the precision of the instrument.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataInitial testing of the reactor by mounting surface thermocouples showed thermal gradients of less than 1°C over the reaction volume during recycle operation at temperatures up to approximately 200°C.
“Initial testing of the reactor by mounting surface thermocouples showed thermal gradients of less than 1°C over the reaction volume during recycle operation at temperatures up to ϳ200°C.”
Quote in the paperNot a substantial claimMay combine two claims.
Study design and conductown dataThese data (with few exceptions) reflect a more or less constant ratio of calcium to magnesium and thus are inadequate to evaluate how the rate may be influenced by changes in cation ratio, or by other influences such as ionic strength.
“These data (with few exceptions) reflect a more or less constant ratio of calcium to magnesium and thus are inadequate to evaluate how the rate may be influenced by changes in cation ratio, or by other influences such as ionic strength”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningBoth the cation disorder and solubility of the surface dolomite phase of these experiments are higher than the underlying substrate.
“It is indeed likely that both the cation disorder and solubility of the surface dolomite phase of these experiments are higher than the underlying substrate”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationown dataThis lack of significant differences may simply reflect the difficulty of resolving phases insufficiently different in composition.
“However, this may simply reflect the difficulty of resolving phases insufficiently different in composition.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
PremisecitationIn earlier synthesis work (Arvidson and Mackenzie, 1997), dolomite is formed through reaction of CaCO3 and (Ca,Mg)Cl2 solutions.
“This observation is direct contrast to earlier synthesis work, discussed in Arvidson and Mackenzie (1997), in which dolomite is formed through reaction of CaCO 3 and (Ca,Mg)Cl 2 solutions.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson and Mackenzie (1997) source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationLippmann (1973) postulated that activated carbonate ions accelerate the rate of magnesite growth.
“Lippmann (1973) has carried this model somewhat further in postulating that it is the influence of ''activated'' carbonate ions that accelerate the rate of magnesite growth.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Lippmann (1973)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenNo provision is made for errors in saturation state calculations.
“No provision is made for errors in saturation state calculations.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningThe growth of sedimentary dolomite under conditions of greatly elevated alkalinity concentrations may not be purely a matter of grossly elevated supersaturations and implies additional dependencies, perhaps on the ratio of Mg2+ to Ca2+ activity.
“The growth of sedimentary dolomite under conditions of greatly elevated alkalinity concentrations, for example by way of sulfate reduction, thus may not be purely a matter of grossly elevated supersaturations and implies additional dependencies, perhaps on the ratio of Mg 2ϩ to Ca 2ϩ activity, not explicitly described by the rate law in its current form.”
Quote in the paperSubstantial claimMay combine two claims.
InterpretationcitationThe time required for reaction at ~50°C, although still lengthy, is not unreasonable, in qualitative agreement with results of Malone, Baker, and Burns (1996).
“Note however, that the time required for reaction at ϳ50°C, although still lengthy, are not unreasonable, in qualitative agreement with the results of Malone, Baker, and Burns (1996).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Malone, Baker, and Burns (1996) source
May combine two claims.
InterpretationcitationThese layers closely resemble those developed in published calcite growth kinetics experiments and imply a mechanism of polynuclear growth, in which surfaces accrete through growth, spread, and coalescence of multiple nucleation points.
“These layers closely resemble those developed in published calcite growth kinetics experiments (compare figs. 3 and 4 with 9, Shiraki and Brantley, 1995) and imply a mechanism of polynuclear growth, in which the surfaces accrete through the growth, spread, and coalescence of multiple nucleation points.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Shiraki and Brantley, 1995 source
May combine two claims.
PremisecitationPoor cation ordering and excess calcium are hallmarks of Holocene dolomite.
“However, poor cation ordering and excess calcium are hallmarks of Holocene dolomite as well, as discussed in Arvidson (1998).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Arvidson (1998)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
May combine two claims.
Interpretationnone givenIn a 0.5 m matrix of NaCl, decrease in activity coefficients and increased complexation retard the rate further.
“In a 0.5 m matrix of NaCl, decrease in activity coefficients and increased complexation retard the rate further.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenErrors for all rates (except those from published hydrothermal bomb experiments) have been estimated by combining titration errors with uncertainty in activation energy using standard propagation of error.
“Errors for all rates (except those computed from published hydrothermal bomb experiments) have been estimated by combining the titration errors with the uncertainty in the activation energy value using standard propagation of error.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
InterpretationreasoningIf the rate of dolomite growth is fundamentally limited by incorporation of magnesium in the MgCO3 layer, then its activation energy would be related to those of magnesium-bearing single carbonates.
“If the rate of dolomite growth is fundamentally limited by the incorporation of magnesium in the MgCO 3 layer, then one would expect its activation energy to be related to those of the magnesium-bearing single carbonates.”
Quote in the paperSubstantial claim- The authors state this as an assumption: The rate of dolomite growth is fundamentally limited by the incorporation of magnesium in the MgCO3 layer.
May combine two claims.
Study design and conductreasoningThe values obtained by regression for parameters are sensitive to errors in observables, and the computed model rate will be sensitive to parameter values chosen from regression.
“The values obtained by regression for these parameters are sensitive to errors in the observables (rates and saturation indices), and the computed model rate will thus also be sensitive to the parameter values chosen from the regression analysis.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
Study design and conductown dataData judged to be of poor quality were excluded from the regression treatment.
“It should be noted that data judged to be of poor quality, either because of problems with the reactor itself or because of uncertainties regarding the effect of coprecipitating phases, were excluded from this treatment.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataThe dolomite forming in these experiments is most likely protodolomite, sensu Graf and Goldsmith (1956), with a solubility greater than that of the underlying dolomite substrate.
“Based on these compositions, comparison of activation energy, and evidence of dissolution in certain runs, the dolomite forming in these experiments is most likely protodolomite, sensu Graf and Goldsmith (1956), with a solubility greater than that of the underlying dolomite substrate.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Graf and Goldsmith (1956) source
May combine two claims.
InterpretationreasoningMg2+ dehydration is a major component of activation energy, with the remaining energy involved in cation ordering.
“Comparison of these energies with those estimated from a comparison of hydration enthalpies of Ca 2ϩ versus Mg 2ϩ suggests that Mg 2ϩ dehydration is a major component of activation energy, with the remaining energy involved in cation ordering.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationown dataSuch developments are possibly twins with shared axes.
“raising the possibility that such developments are twins with shared axes.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningExtrapolations to laboratory conditions suggest infeasibly long reaction times at 25°C, but with significant improvement at slightly higher temperatures.
“Extrapolations to laboratory conditions suggest infeasibly long reaction times at 25°, but with significant improvement at slightly higher temperatures.”
- Also stated in: § CONCLUSIONS · hedged
“The times estimated for 25°C reactions (10 1 to 10 2 yrs) suggest that direct laboratory observation under these conditions is infeasible.”
Quote in the paperSubstantial claim- Also stated in: § CONCLUSIONS · hedged
Classified as probably not a substantial claim.
InterpretationreasoningPast environmental shifts may have altered the fluxes of magnesium to carbonate versus basalt reservoirs.
“However, if the abundance of dolomite reflects its absolute precipitation rate in the environment, the high sensitivity of the rate to changes in temperature and seawater chemistry raises the possibility that past environmental shifts have altered the fluxes of magnesium to carbonate versus basalt reservoirs.”
Quote in the paperSubstantial claim- Rests on an assumption: The abundance of dolomite reflects its absolute precipitation rate in the environment.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationRecent work tends to be largely dismissive of the importance of dolomite.
“Although the control and history of seawater composition has long been of interest, recent work tends to be largely dismissive of the importance of dolomite (Hardie, 1996;Stanley and Hardie, 1998).”
Quote in the paperNot a substantial claim0 of 2 sources checked
The authors state this as an assumption.
The precipitation rate of dolomite can be described by a rate law of the form r = k(Ω − 1)^n.
“As a working hypothesis, it is suggested that the precipitation rate of dolomite may be quantified and modeled in a manner similar to other carbonate minerals through application of a rate law that represents the rate as a simple function of saturation index, r ؍ k(⍀ ؊ 1) n .”
The authors state this as an assumption.
The rate constant k has an Arrhenius form.
“The rate constant k is assumed to have an Arrhenius form,”
The authors state this as an assumption.
The reactive surface area S is equivalent to the total surface area of the seed material.
“S, hereafter assumed equivalent to total surface area”
The paper relies on this without support.
The meager distribution of Recent dolomite contrasts strongly with its common abundance in ancient sedimentary rocks of marine origin, producing the dolomite problem.
“The meager distribution of Recent dolomite contrasts strongly with its common abundance in ancient sedimentary rocks of marine origin, leading to the paradox commonly referred to as the ''dolomite problem.''”
The paper relies on this without support.
Surface seawater is strongly oversaturated with respect to ideal dolomite, and yet there is little evidence of widespread dolomite precipitation in modern, open marine sediments.
“Surface seawater is strongly oversaturated with respect to ideal dolomite (CaMg(CO 3 ) 2 ), and yet there is little evidence of widespread dolomite precipitation in modern, open marine sediments.”
The paper relies on this without support.
There is a general consensus that the dearth of Recent dolomite reflects a kinetic control.
“There is a general consensus that the dearth of Recent dolomite reflects a kinetic control, but there are very few measurements of rates of dolomite growth from either field or laboratory settings.”
The authors state this as an assumption.
Corrections for pH electrode drift can be made by assuming the slope and intercept are linear functions of time.
“Corrections due to drift in the electrode's calibration were made by assuming the slope and intercept to be linear functions of time t, and interpolating pH(t) appropriately.”
The authors state this as an assumption.
The terms represented by the ellipsis in eq (8) are invariant over the experimental temperature span.
“The ellipsis in eq (8) encumbers terms assumed to be invariant over this span of temperature.”
The authors state this as an assumption.
The reaction is driven by the distance from equilibrium with respect to ideal dolomite, not by a phase rendered more soluble by calcium enrichment and cation disordering.
“Second, we have made the assumption that it is the distance from equilibrium with respect to ideal dolomite and not a phase rendered more soluble by calcium enrichment and cation disordering that drives this reaction.”
The authors state this as an assumption.
The mechanism of growth is identical in magnesite and calcite, and thus the values for frequency factor and reaction order are identical.
“If we assume that the mechanism of growth is identical in both minerals (and thus that the values for frequency factor and reaction order are identical)”
The authors state this as an assumption.
Dolomite growth can be viewed as a process of constructing alternating layers of calcite and magnesite.
“If dolomite growth is viewed as a process of constructing alternating layers of calcite and magnesite”
The authors state this as an assumption.
At a given temperature, dehydration of calcium requires less energy than magnesium.
“If, at a given temperature, dehydration of calcium requires less energy than magnesium”
The authors state this as an assumption.
The rate of dolomite growth is fundamentally limited by the incorporation of magnesium in the MgCO3 layer.
“If the rate of dolomite growth is fundamentally limited by the incorporation of magnesium in the MgCO 3 layer”
The authors state this as an assumption.
Ordering in the relatively well-ordered dolomites synthesized by Gaines (1968) is essentially perfect.
“If ordering in the latter case is assumed to be essentially perfect”
The authors state this as an assumption.
The change in activation energy with MgCO3 content is linear.
“A linear relationship is assumed for the change in activation energy with MgCO 3 , using energies for calcite (Kazmierczak, Tomson, and Nancollas, 1982) and magnesite (computed from Lippmann, 1973).”
The authors state this as an assumption.
The entry for logr + εA/2.3RT assumes an activation energy value of 31.9 kcal mol−1.
“The entry for logr ϩ ⑀ A /2.3 RT assumes an activation energy value of 31.9 kcal mol Ϫ1 computed from run Ti10.”
The authors state this as an assumption.
Both regression lines assume an activation energy of 31.9 kcal mol−1.
“Both lines assume an activation energy of 31.9 kcal mol Ϫ1 .”
The authors state this as an assumption.
The difference in solubility between the product surface phase and ideal dolomite is not a function of temperature.
“If we make the dubious assumption that this difference in solubility is not a function of temperature”
The authors state this as an assumption.
The coprecipitated phase is a calcian dolomite with 57 percent CaCO3.
“assuming a calcian dolomite (57 percent CaCO 3 )”
The authors state this as an assumption.
Magnesium dehydration is the controlling step for the activation energy of the dolomite phase formed in this experiment.
“predicted by assuming magnesium dehydration to be the controlling step”
The authors state this as an assumption.
Sufficient measurements are feasible to apply classical nucleation and crystal growth theory to dolomite.
“assuming that sufficient measurements are feasible.”
The paper relies on this without support.
The abundance of dolomite reflects its absolute precipitation rate in the environment.
“if the abundance of dolomite reflects its absolute precipitation rate in the environment”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Previous works have noted an increasing dolomitization rate with higher alkalinity in all experiments.
“Previous works have also noted an increasing dolomitization rate with higher alkalinity in all experiments.69−71”
From Low-Temperature Synthesis of Disordered Dolomite and High-Magnesium Calcite in Ethanol–Water Solutions: The Solvation Effect and Implications (2022) · cites this paper as [71]
In “Relevance of Experimental Results to Natural Carbonate Minerals” (page unavailable), the paper says its measured dolomite precipitation rate depends strongly on saturation index, which mostly reflects carbonate-ion availability. This supports the general alkalinity–rate relationship, but not the claim that the rate increased with higher alkalinity in all experiments; the paper describes the experimental effect as only “at least partly borne out” and reports that calcite growth could severely diminish dolomite precipitation. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe conversion of very high-Mg calcite to dolomite may take a long time under ambient conditions, but this may not be long on a geologic timescale.
“It is possible that the process takes a long time under ambient conditions [72,132,144], but this may not be long on a geologic timescale.”
From Thermodynamic and Kinetic Studies of Dolomite Formation: A Review (2023) · cites this paper as [144]
The ‘Relevance of Experimental Results to Natural Carbonate Minerals’ section estimates tens to hundreds of years for dolomite precipitation at 25°C, and the Introduction contrasts laboratory experiments with the age of Recent natural dolomite. Those passages support a long ambient-timescale process that may be short geologically, but they do not establish the claim’s specific process of converting very high-Mg calcite to dolomite. The Conclusions instead report no evidence that magnesian calcite acts as a reactive intermediate. (LLM, conf=0.84)
Experimental — accuracy not yet measuredNon-classical crystallization can be seen as a preliminary step prior to nucleation of the crystalline step, which may occur to overcome kinetic barriers.
“Thus, the non-classical crystallization can be seen as a preliminary step prior to the nucleation of the crystalline step, which may occur to overcome the kinetic barriers.37,56”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [37]
The Methods and ‘Relevance of Experimental Results to Natural Carbonate Minerals’ sections (pages not provided) describe small nuclei coalescing into larger dolomite crystals. They do not describe non-classical crystallization as a step before nucleation or say that this sequence overcomes kinetic barriers. (LLM, conf=0.82)
Experimental — accuracy not yet measuredAcetic acid treatment of SSW precipitates revealed low yields of Mg calcite (19-49 mol % Mg) and disordered (64-75 mol % Mg) and ordered dolomite.
“Precipitates treated with weak acetic acid to remove Ca carbonates (e.g., 24) revealed low yields [based on Xray diffraction (XRD) intensity] of Mg calcite (19-49 mol % Mg; calculated from XRD with 3; % MgCO 3 = [(-363.96*d-spacing)+ 1,104.5])and disordered (64-75 mol % Mg; calculated from XRD with 3) and ordered dolomite [CaMg(CO 3 ) 2 ] (Fig. 3).”
From Surface chemistry allows for abiotic precipitation of dolomite at low temperature (2013) · cites this paper as [3]
The Methods passage describes calculating Mg-calcite composition from XRD d-spacing and gives a regression close to the one cited, though its intercept is 1104.05 rather than 1104.5. It does not establish the cited XRD method for calculating disordered-dolomite composition. The SSW yields and composition ranges are the citing paper’s reported results, not findings attributed to this source. (LLM, conf=0.84)
Experimental — accuracy not yet measuredOne crystallization mechanism does not exclude the other.
“It is also important to note that one mechanism does not exclude the other.37”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [37]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Katz and Matthews activation energy is given as both 49 and 48
MinorThe text calls 49 kcal/mol the published Katz and Matthews value, but later identifies 48 kcal/mol as the value taken from that publication for the model fits.
“the only published value of 49 kcal mol Ϫ1 , determined from rates at temperatures from 252° to 295°C by Katz and Matthews (1977).”
“The latter two values are taken from the analysis of data from Gaines (1968, see also Arvidson and Mackenzie, 1997) and published values from Katz and Matthews (1977), respectively.”
Temperature-normalization formula omits the logarithm conversion factor
MinorThe final note specifies log r + εA/RT for comparing rates across temperatures, while Table 5 specifies log r + εA/(2.3 RT). For the base-10 logarithms used in the rate law, these are different normalizations.
“By using the term log r ϩ ⑀ A /RT, the intention is to compare rates that are essentially normalized with respect to temperature and thus primarily observe the effect of changing saturation state.”
“The entry for logr ϩ ⑀ A /2.3 RT assumes an activation energy value of 31.9 kcal mol Ϫ1 computed from run Ti10.”
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Chapter 4. MAGNESIAN CALCITES: LOW-TEMPERATURE OCCURRENCE, SOLUBILITY and SOLID-SOLUTION BEHAVIOR
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Recent dolomite in the Persian Gulf
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Evolution of Sedimentary Rocks
Veizer, J., & Mackenzie, F. T. (2014) · Treatise on Geochemistry · doi:10.1016/b978-0-08-095975-7.00715-4 · Cited by 1,592 · see citing works
Palandri, J. L., & Kharaka, Y. K. (2004) · Open-File Report · doi:10.3133/ofr20041068 · Cited by 1,352 · see citing works
Calcium Carbonate Formation and Dissolution
Morse, J. W., Arvidson, R. S., & Lüttge, A. (2007) · Chemical Reviews · doi:10.1021/cr050358j · Cited by 1,228 · see citing works
Self-citationConcepts and models of dolomitization: a critical reappraisal
Machel, H. G. (2004) · Geological Society, London, Special Publications · doi:10.1144/gsl.sp.2004.235.01.02 · Cited by 787 · see citing works
Gregg, J. M., Bish, D. L., Kaczmarek, S. E., & Machel, H. G. (2015) · Sedimentology · doi:10.1111/sed.12202 · Cited by 480 · see citing works
“…Gaines, 1968, 1974; Katz & Matthews, 1977; Malone et al., 1996; Arvidson & Mackenzie, 1997, 1999), at higher alkalinity (Morrow & Rickets, 1988; Arvidson and MacKenzie, 1997, 1999), at higher concentrations (molarity) of Ca and Mg (Land, 1967), at higher fluid to rock ratios (Land, 1967) and…”
BackgroundResultInfluentialThe earliest Cambrian record of animals and ocean geochemical change
Maloof, A. C., Porter, S. M., Moore, J. L., Dudas, F. O., Bowring, S. A., Higgins, J. A., Fike, D. A., & Eddy, M. P. (2010) · Geological Society of America Bulletin · doi:10.1130/b30346.1 · Cited by 419 · see citing works
Microbially catalyzed dolomite formation: From near-surface to burial
Petrash, D. A., Bialik, O. M., Bontognali, T. R. R., Vasconcelos, C., Roberts, J. A., McKenzie, J. A., & Konhauser, K. O. (2017) · Earth-Science Reviews · doi:10.1016/j.earscirev.2017.06.015 · Cited by 338 · see citing works
“Such diversity in KSP values strongly reflects the difficulties involved with obtaining stoichiometric dolomite at low temperatures (Morse and Mackenzie, 1990; Arvidson and Mackenzie, 1999).”
BackgroundInfluentialMorse, J. W., Andersson, A. J., & Mackenzie, F. T. (2006) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2006.08.017 · Cited by 324 · see citing works
“This lack of a critical end member has led to extensive theoretical controversy (e.g., Busenberg and Plummer, 1989; Lippmann, 1991; Glynn and Reardon, 1992a,b; Königsberger and Gamsjäger, 1992; Arvidson and Mackenzie, 1999).”
BackgroundHydrothermal transport and deposition of the rare earth elements by fluorine-bearing aqueous liquids
Migdisov, A., & Williams‐Jones, A. E. (2014) · Mineralium Deposita · doi:10.1007/s00126-014-0554-z · Cited by 315 · see citing works
“like calcite and dolomite (e.g. Duan and Li 2008; Arvidson and Mackenzie 1999) it is probable that REE-carbonate minerals are also relatively insoluble, which only serves to further limit the ability of REE-carbonate/bicarbonate ions to transport REE.”
BackgroundOxygen and carbon isotope fractionation in the system dolomite–water–CO2 to elevated temperatures
Horita, J. (2014) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2013.12.027 · Cited by 298 · see citing works
Experimental study of igneous and sedimentary apatite dissolution
Guidry, M., & Mackenzie, F. T. (2003) · Geochimica et Cosmochimica Acta · doi:10.1016/s0016-7037(03)00265-5 · Cited by 273 · see citing works
Choudens-Sanchez, V. D., & González, L. A. (2009) · Journal of Sedimentary Research · doi:10.2110/jsr.2009.043 · Cited by 258 · see citing works
Surface chemistry allows for abiotic precipitation of dolomite at low temperature
Roberts, J. A., Kenward, P. A., Fowle, D. A., Goldstein, R. H., González, L. A., & Moore, D. S. (2013) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1305403110 · Cited by 246 · see citing works
“Kinetic inhibition is attributed to lack of solution supersaturation (3), sulfate inhibition (1), cation desolvation (4), and lack of nucleation sites (5).”
BackgroundJiang, G., Kennedy, M. J., Christie-Blick, N., Wu, H., & Zhang, S. (2006) · Journal of Sedimentary Research · doi:10.2110/jsr.2006.086 · Cited by 228 · see citing works
“These structures are not easily explained by deformation related to expansive crystallization alone (James et al. 2001), especially inasmuch as the stabilization to dolomite involves a 9% reduction in crystal volume (Arvidson and Mackenzie 1999).”
BackgroundThe Chemistry of Metal Transport and Deposition by Ore-Forming Hydrothermal Fluids
Seward, T. M., Williams‐Jones, A. E., & Migdisov, A. (2013) · Treatise on Geochemistry · doi:10.1016/b978-0-08-095975-7.01102-5 · Cited by 252 · see citing works
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“In general, high SI value (Arvidson and Mackenzie, 1999), high Mg/Ca ratio (Folk and Land, 1975; Gaines, 1980), and low sulfate concentration (Vasconcelos andMcKenzie, 1997; Vasconcelos et al.”
BackgroundKaczmarek, S. E., & Sibley, D. F. (2011) · Sedimentary Geology · doi:10.1016/j.sedgeo.2011.07.003 · Cited by 199 · see citing works
“High-temperature synthesis experiments have been the primary source of information about the dolomitization reaction (Graf and Goldsmith, 1956; Gaines, 1974; Katz and Matthews, 1977; Gaines, 1980; Baker and Kastner, 1981; Sibley et al., 1987; Morrow and Rickets, 1988; Sibley, 1990; Sibley et al., 1994; Usdowski, 1994;…”
BackgroundGeochemical Implications of Gas Leakage associated with Geologic CO 2 Storage—A Qualitative Review
Harvey, O. R., Qafoku, N. P., Cantrell, K. J., Lee, G., Amonette, J. E., & Brown, C. F. (2012) · Environmental Science & Technology · doi:10.1021/es3029457 · Cited by 202 · see citing works
An assessment of calcite crystal growth mechanisms based on crystal size distributions
Kile, D. E., Eberl, D. D., Hoch, A. R., & Reddy, M. M. (2000) · Geochimica et Cosmochimica Acta · doi:10.1016/s0016-7037(00)00394-x · Cited by 191 · see citing works
Testing the cation-hydration effect on the crystallization of Ca–Mg–CO <sub>3</sub> systems
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“" Abiotic precipitation rates at low temperature, estimated from higher temperature experiments done by Arvidson and Mackenzie (1999), are 5 orders of magnitude slower than those for magnesite.”
BackgroundAnaerobic methane oxidation and the formation of dolomite
Moore, T. S., Murray, R. W., Kurtz, A. C., & Schrag, D. P. (2004) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2004.10.015 · Cited by 174 · see citing works
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Kinetics and mechanisms of dolomite dissolution in neutral to alkaline solutions revisited
Сергеевич, П. О. (2001) · American Journal of Science · doi:10.2475/ajs.301.7.597 · Cited by 168 · see citing works
“This value, however, is in close agreement with that derived by Arvidson and Mackenzie (1997, 1999) from a simple kinetic model using data on high-temperature dolomite synthesis experiments.”
InfluentialOn the potential of CO2–water–rock interactions for CO2 storage using a modified kinetic model
Pham, V. T. H., Lü, P., Aagaard, P., Zhu, C., & Hellevang, H. (2011) · International journal of greenhouse gas control · doi:10.1016/j.ijggc.2010.12.002 · Cited by 165 · see citing works
A route for the direct crystallization of dolomite
Rodriguez-Blanco, J. D., Shaw, S., & Benning, L. G. (2015) · American Mineralogist · doi:10.2138/am-2015-4963 · Cited by 161 · see citing works
“…other Ca-Mg carbonates (Katz and Matthews 1977; Zempolich and Baker 1993; Sibley et al. 1994), or followed proto-dolomite crystallization (Malone et al. 1996) or dolomite growth (Gaines 1977; Arvidson and Mackenzie 1999; Higgins and Hu 2005; Hu et al. 2005, 2006) on various carbonate seed crystals.”
BackgroundMethodZhuang, D., Yan, H., Tucker, M. E., Zhao, H. C., Han, Z., Zhao, Y., Sun, B., Li, D., Pan, J., Zhao, Y., et al. (2018) · Chemical Geology · doi:10.1016/j.chemgeo.2018.09.018 · Cited by 155 · see citing works
Energetic and structural studies of amorphous Ca1−Mg CO3·nH2O (0 ⩽x⩽ 1)
Radha, A. V., Fernandez-Martinez, A., Hu, Y., Jun, Y.-S., Waychunas, G. A., & Navrotsky, A. (2012) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2012.04.056 · Cited by 151 · see citing works
Liu, D., Xu, Y., Papineau, D., Yu, N., Fan, Q., Qiu, X., & Wang, H. (2019) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2018.12.036 · Cited by 141 · see citing works
Kinetic modelling of CO2–water–rock interactions
Hellevang, H., Pham, V. T. H., & Aagaard, P. (2013) · International journal of greenhouse gas control · doi:10.1016/j.ijggc.2013.01.027 · Cited by 138 · see citing works
Dissolution enables dolomite crystal growth near ambient conditions
Kim, J., Kimura, Y., Puchala, B., Yamazaki, T., Becker, U., & Sun, W. (2023) · Science · doi:10.1126/science.adi3690 · Cited by 138 · see citing works
MAGic: A Phanerozoic model for the geochemical cycling of major rock-forming components
Arvidson, R. S. (2006) · American Journal of Science · doi:10.2475/ajs.306.3.135 · Cited by 131 · see citing works
Self-citationMagnesium inhibition of calcite dissolution kinetics
Arvidson, R. S., Collier, M., Davis, K. J., Vinson, M. D., Amonette, J. E., & Lüttge, A. (2006) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2005.10.005 · Cited by 131 · see citing works
“1D) were computed from measured pH, total alkalin- ity, and total dissolved components using an ion-association model (Arvidson and Mackenzie, 1999), and calculations using this model confirmed far-from-equilibrium conditions with respect to calcite (Ca2+T between 4 and 0.4 nM, with DGr between 23…”
MethodInfluentialSelf-citationKaczmarek, S. E., & Thornton, B. P. (2017) · Chemical Geology · doi:10.1016/j.chemgeo.2017.08.004 · Cited by 128 · see citing works
Nonphotosynthetic Bacteria and the Formation of Carbonates and Evaporites Through Time
Wright, D. T., & Oren, A. (2005) · Geomicrobiology Journal · doi:10.1080/01490450590922532 · Cited by 123 · see citing works
“1995 ; Tribble et al. 1995 ; Arvidson and Mackenzie 1999 ).”
Dolomitization and isotope stratigraphy of the Vazante Formation, São Francisco Basin, Brazil
Azmy, K., Veizer, J., Misi, A., de Oliveira, T. F., Sanches, A. L., & Dardenne, M. A. (2001) · Precambrian Research · doi:10.1016/s0301-9268(01)00194-2 · Cited by 121 · see citing works
Calcium isotope (δ44/40Ca) variations of Neogene planktonic foraminifera
Heuser, A., Eisenhauer, A., Böhm, F., Wallmann, K., Gussone, N., Pearson, P. N., Nägler, T. F., & Dullo, W. (2005) · Paleoceanography · doi:10.1029/2004pa001048 · Cited by 119 · see citing works
SEDIMENTARY CHLOROPHYLL DETERMINATION AS A PALEOBOTANICAL METHOD
Vallentyne, J. R. (1955) · Canadian Journal of Botany · doi:10.1139/b55-026 · Cited by 118 · see citing works
Whitaker, F., & Xiao, Y. (2010) · AAPG Bulletin · doi:10.1306/12090909075 · Cited by 116 · see citing works
Pham, T. H. V., Aagaard, P., & Hellevang, H. (2012) · Geochemical Transactions · doi:10.1186/1467-4866-13-5 · Cited by 113 · see citing works
“As previously stated, the low-temperature formation of dolomite and magnesite is not likely because of the high apparent activation energy and small kinetic coefficients for the growth of Mg-carbonates [35-37].”
BackgroundSynsedimentary diagenesis in a Cryogenian reef complex: Ubiquitous marine dolomite precipitation
Hood, A. V. S., & Wallace, M. W. (2012) · Sedimentary Geology · doi:10.1016/j.sedgeo.2012.02.004 · Cited by 112 · see citing works
“…of these factors include the solubility of the reactant (Katz and Mathews, 1977), the Mg2+/Ca2+ ratio of the fluid (Sibley et al., 1987), the presence of dissolved sulphate (Baker and Kastner, 1981), as well as the temperature and saturation state of the solution (Arvidson and MacKenzie, 1999).”
BackgroundModeling fracture porosity evolution in dolostone
Gale, J., Lander, R. H., Reed, R. M., & Laubach, S. E. (2009) · Journal of Structural Geology · doi:10.1016/j.jsg.2009.04.018 · Cited by 111 · see citing works
“If the fluid was undersaturated, or if chemically reactive fluids are present, then dissolution may result (Arvidson and Mackenzie, 1999; Morse et al., 2007).”
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Calcite dissolution kinetics in Na–Ca–Mg–Cl brines
Gledhill, D. K., & Morse, J. W. (2006) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2006.03.024 · Cited by 104 · see citing works
Dolomitization: from conceptual to numerical models
Whitaker, F., Smart, P. L., & Jones, G. (2004) · Geological Society London Special Publications · doi:10.1144/gsl.sp.2004.235.01.05 · Cited by 111 · see citing works
Al-Helal, A., Whitaker, F., & Xiao, Y. (2012) · Journal of Sedimentary Research · doi:10.2110/jsr.2012.14 · Cited by 106 · see citing works
High salinity facilitates dolomite precipitation mediated by Haloferax volcanii DS52
Qiu, X., Wang, H., Yao, Y., & Duan, Y. (2017) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2017.05.018 · Cited by 102 · see citing works
Oskierski, H. C., Dlugogorski, B. Z., & Jacobsen, G. (2013) · Chemical Geology · doi:10.1016/j.chemgeo.2013.09.001 · Cited by 101 · see citing works
“It is noteworthy that, the formation of both magnesite and dolomite under ambient conditions is kinetically inhibited (Arvidson and MacKenzie, 1999; Giammar et al., 2005; Hänchen et al., 2008; Saldi et al., 2009) and that weathering-related formation of magnesite is thought to proceed via initial precipitation of a hy…”
BackgroundEtschmann, B. E., Brugger, J., Pearce, M. A., Ta, C., Brautigan, D., Jung, M., & Pring, A. (2014) · Contributions to Mineralogy and Petrology · doi:10.1007/s00410-014-1045-z · Cited by 99 · see citing works
“Our experiments were performed under hydrothermal conditions to enhance kinetics: Tens to hundreds of years are required to nucleate dolomite abiotically at low temperature (<50 °C), even from highly supersaturated solutions (lund 1998; arvidson and Mackenzie 1999; Kaczmarek and Sibley 2011).”
MethodRaiswell, R., & Fisher, Q. J. (2004) · Chemical Geology · doi:10.1016/j.chemgeo.2004.06.020 · Cited by 99 · see citing works
“There are rather fewer studies of dolomite but a similar rate law (with n=2.2 at 25 8C) has been found by Arvidson and Mackenzie (1999) .”
BackgroundInfluentialExperimental calibration of clumped isotope reordering in dolomite
Lloyd, M. K., Ryb, U., & Eiler, J. M. (2018) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2018.08.036 · Cited by 100 · see citing works
Baldermann, A., Deditius, A., Dietzel, M., Fichtner, V., Fischer, C., Hippler, D., Leis, A., Baldermann, C., Mavromatis, V., Stickler, C. P., et al. (2015) · Chemical Geology · doi:10.1016/j.chemgeo.2015.07.020 · Cited by 99 · see citing works
Inhibition of Calcite Growth: Combined Effects of Mg 2+ and SO 4 2–
Nielsen, M. R., Sand, K. K. S., Blanco, J. D. R., Bovet, N., Generosi, J., Dalby, K. N., & Stipp, S. L. S. (2016) · Crystal Growth & Design · doi:10.1021/acs.cgd.6b00536 · Cited by 99 · see citing works
Kaczmarek, S. E., Gregg, J. M., Bish, D. L., Machel, H. G., & Fouke, B. W. (2017) · Characterization and Modeling of Carbonates–Mountjoy Symposium 1 · doi:10.2110/sepmsp.109.01 · Cited by 95 · see citing works
Carbonates before skeletons: A database approach
Cantine, M. D., Knoll, A. H., & Bergmann, K. (2019) · Earth-Science Reviews · doi:10.1016/j.earscirev.2019.103065 · Cited by 97 · see citing works
Moreira, N., Walter, L. M., Vasconcelos, C., Mckenzie, J., & McCall, P. J. (2004) · Geology · doi:10.1130/g20353.1 · Cited by 88 · see citing works
Spatial patterns of diagenesis during geothermal circulation in carbonate platforms
Wilson, A. M. (2001) · American Journal of Science · doi:10.2475/ajs.301.8.727 · Cited by 94 · see citing works
“…of a specific stoichiometric equation for dolomitization (eq 1) and because a kinetic expression for precipitation of dolomite is available (Arvidson and Mackenzie, 1999) rdol Ask QK 1 2/3 (2) where rdol is the reaction rate of dolomite; As is the specific surface area of dolomite…”
BackgroundInfluentialGherardi, F., Audigane, P., & Gaucher, É. C. (2011) · Journal of Hydrology · doi:10.1016/j.jhydrol.2011.12.026 · Cited by 91 · see citing works
“The precipitation of 392 secondary minerals is represented using the same kinetic expression and rates as that for 393 dissolution, except for kaolinite (Yang and Steefel, 2008), SiO2-polymorphs (Rimstidt and Barnes, 394 1980) and dolomite (Arvidson and Mackenzie, 1999).”
Pirlet, H., Wehrmann, L., Brunner, B., Frank, N., Dewanckele, J., Rooij, D. V., Foubert, A., Swennen, R., Naudts, L., Boone, M., et al. (2009) · Sedimentology · doi:10.1111/j.1365-3091.2009.01119.x · Cited by 86 · see citing works
“Carbonate phases such as calcite and high-magnesium calcite have been found to precipitate competitively with dolomite (Arvidson & Mackenzie, 1999).”
BackgroundWarthmann, R., Vásconcelos, C., Sass, H., & McKenzie, J. A. (2005) · Extremophiles · doi:10.1007/s00792-005-0441-8 · Cited by 87 · see citing works
“The mechanism of sedimentary dolomite formation under low temperature conditions (below 80 C) has long been a controversy, because it has proven impossible to precipitate dolomite inorganically due to kinetic inhibition (McKenzie 1991; Land 1998; Arvidson and Mackenzie 1999).”
BackgroundBustillo, M. Á., & Alonso‐Zarza, A. M. (2006) · Sedimentary Geology · doi:10.1016/j.sedgeo.2006.12.006 · Cited by 88 · see citing works
“Arvidson and Mackenzie (1999) argue that their growth morphology depends on the saturation of the solution, a high saturation favouring fast and continuous growth resulting in spheroidal instead of rhombohedral morphology (as spheroids have more surface area).”
BackgroundDolomite abundance in Chinese loess deposits: A new proxy of monsoon precipitation intensity
Meng, X., Liu, L., Balsam, W., Li, S., He, T., Chen, J., & Ji, J. (2015) · Geophysical Research Letters · doi:10.1002/2015gl066681 · Cited by 89 · see citing works
“Stoichiometric dolomite in Quaternary soil has to be inherited, because only protodolomite forms in soils due to a kinetic barrier [Arvidson and Mackenzie, 1999].”
BackgroundFormation and Diagenesis of Carbonate Sediments
Arvidson, R., & Morse, J. (2014) · Treatise on Geochemistry · doi:10.1016/b978-0-08-095975-7.00703-8 · Cited by 6 · see citing works
Self-citationStabilization of Aragonite: Role of Mg 2+ and Other Impurity Ions
Boon, M., Rickard, W. D. A., Rohl, A. L., & Jones, F. (2020) · Crystal Growth & Design · doi:10.1021/acs.cgd.0c00152 · Cited by 82 · see citing works
García Del Cura, M. A., Calvo, J. P., Ordóñez, S., Jones, B. F., & Cañaveras, J. C. (2001) · Sedimentology · doi:10.1046/j.1365-3091.2001.00388.x · Cited by 81 · see citing works
“…distinct geological circumstances (for reviews of the `dolomite problem' as well as dolomitization models, see Fairbridge, 1957; Zenger, 1972; Lippman, 1973; Morrow, 1982a, b; Land, 1985; Machel & Mountjoy, 1986; Gunatilaka, 1987; Hardie, 1987; Tucker & Wright, 1990; Arvidson & Mackenzie, 1999).”
Xiao, Y., Xu, T., & Pruess, K. (2009) · Energy Procedia · doi:10.1016/j.egypro.2009.01.233 · Cited by 80 · see citing works
“26 is the reaction order [5].”
Chapter 1 The Geochemistry of Continental Carbonates
Deocampo, D. M. (2010) · Developments in Sedimentology · doi:10.1016/s0070-4571(09)06201-3 · Cited by 77 · see citing works
A global study of dolomite stoichiometry and cation ordering through the Phanerozoic
Manche, C. J., & Kaczmarek, S. E. (2021) · Journal of Sedimentary Research · doi:10.2110/jsr.2020.204 · Cited by 76 · see citing works
Crystal-Growth Behavior in Ca−Mg Carbonate Bacterial Spherulites
Sánchez‐Navas, A., Martı́n-Algarra, A., Rivadeneyra, M. A., Melchor, S., & Martín-Ramos, J. D. (2009) · Crystal Growth & Design · doi:10.1021/cg801320p · Cited by 71 · see citing works
Chaïrat, C., Oelkers, É. H., Jacques Schott, A., & Lartigue, J.-É. (2007) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2007.09.026 · Cited by 72 · see citing works
Kaczmarek, S. E., & Sibley, D. F. (2007) · Journal of Sedimentary Research · doi:10.2110/jsr.2007.035 · Cited by 72 · see citing works
“As a result, the applicability of high-temperature experiments to natural low-temperature systems remains debated (Arvidson and Mackenzie 1999).”
BackgroundJones, G., Smart, P. L., Whitaker, F., et al. (2003) · AAPG Bulletin · doi:10.1306/03260302007 · Cited by 70 · see citing works
Liu, D., Fan, Q., Papineau, D., Yu, N., Chu, Y., Wang, H., Qiu, X., & Wang, X. (2020) · Chemical Geology · doi:10.1016/j.chemgeo.2019.119415 · Cited by 68 · see citing works
Yan, H., Han, Z., Zhao, H. C., Pan, J., Zhao, Y., Tucker, M. E., Zhou, J., Yan, X., Yang, H., & Fan, D. (2019) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2019.119826 · Cited by 69 · see citing works
Sun, X., Higgins, J. A., & Turchyn, A. V. (2015) · Marine Geology · doi:10.1016/j.margeo.2015.12.011 · Cited by 69 · see citing works
Sedimentary dolomite: a reality check
Wright, D. T., & Wacey, D. (2004) · Geological Society London Special Publications · doi:10.1144/gsl.sp.2004.235.01.03 · Cited by 72 · see citing works
Coupled thermal-hydraulic-chemical modelling of enhanced geothermal systems
Bächler, D., & Köhl, T. (2005) · Geophysical Journal International · doi:10.1111/j.1365-246x.2005.02497.x · Cited by 67 · see citing works
“(A3) The dolomite precipitation law is derived from Arvidson & Mackenzie (1999): rp = 1.122 × 105 × s × exp (−16060 T ) × ( Q K − 1 )2.26 .”
InfluentialDiLoreto, Z. A., Bontognali, T. R. R., Al Disi, Z. A., Al-Kuwari, H. A. S., Williford, K. H., Strohmenger, C. J., Sadooni, F., Palermo, C., Rivers, J. M., McKenzie, J. A., et al. (2019) · Extremophiles · doi:10.1007/s00792-018-01074-4 · Cited by 66 · see citing works
Formation and Diagenesis of Carbonate Sediments
Morse, J. W. (2003) · Elsevier eBooks · doi:10.1016/b0-08-043751-6/07093-6 · Cited by 90 · see citing works
“…kinetics of dolomite are too slow to be studied in the laboratory at near Earth-surface temperatures (Land, 1998), experiments on dolomite reaction kinetics (e.g., Arvidson and Mackenzie, 1999) have generally been conducted at elevated temperatures (typically between 100 8C and 300 8C).”
Calcite dissolution kinetics in saline waters
Finneran, D. W., & Morse, J. W. (2009) · Chemical Geology · doi:10.1016/j.chemgeo.2009.08.006 · Cited by 65 · see citing works
Casado, A. I., Alonso‐Zarza, A. M., & Iglesia, Á. L. (2014) · Sedimentary Geology · doi:10.1016/j.sedgeo.2014.07.005 · Cited by 64 · see citing works
From soil to sea: the role of groundwater in coastal critical zone processes
Sawyer, A. H., Michael, H. A., & Schroth, A. W. (2016) · Wiley Interdisciplinary Reviews Water · doi:10.1002/wat2.1157 · Cited by 64 · see citing works
“Although dolomite is abundant in ancient carbonates,(68) it is surprisingly resistant to precipitation in the laboratory under near-surface temperatures.(69) Geothermal convection of saline water may explain the widespread occurrence of massive dolomites in the rock record.”
BackgroundClimate-Change Effects on Soils: Accelerated Weathering, Soil Carbon, and Elemental Cycling
Qafoku, N. P. (2015) · Advances in agronomy · doi:10.1016/bs.agron.2014.12.002 · Cited by 64 · see citing works
Al Disi, Z. A., Zouari, N., Dittrich, M., Jaoua, S., Al-Kuwari, H. A. S., & Bontognali, T. R. R. (2019) · Marine Chemistry · doi:10.1016/j.marchem.2019.103693 · Cited by 61 · see citing works
A review of in situ carbon mineralization in basalt
Cao, X., Li, Q., Xu, L., & Tan, Y. (2023) · Journal of Rock Mechanics and Geotechnical Engineering · doi:10.1016/j.jrmge.2023.11.010 · Cited by 69 · see citing works
Hellevang, H., Haile, B. G., & Tetteh, A. (2016) · Greenhouse Gases Science and Technology · doi:10.1002/ghg.1619 · Cited by 64 · see citing works
Corsetti, F. A., Kidder, D. L., & Marenco, P. J. (2006) · Sedimentary Geology · doi:10.1016/j.sedgeo.2006.03.021 · Cited by 62 · see citing works
Experimental determination of the solubility product of dolomite at 50–253 °C
Bénézeth, P., Berninger, U.-N., Bovet, N., Jacques Schott, A., & Oelkers, É. H. (2018) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2018.01.016 · Cited by 60 · see citing works
Liu, D., Yu, N., Papineau, D., Fan, Q., Wang, H., Qiu, X., She, Z., & Luo, G. (2019) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2019.07.056 · Cited by 61 · see citing works
Chapter 2 Diagenesis of Carbonates in Continental Settings
Armenteros, I. A. (2009) · Developments in sedimentology · doi:10.1016/s0070-4571(09)06202-5 · Cited by 61 · see citing works
Zhang, F., Yan, C., Teng, H. H., Roden, E., & Xu, H. (2012) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2012.11.010 · Cited by 60 · see citing works
Ganqing, J., Xiaoying, S., & Shihong, Z. (2006) · Chinese Science Bulletin · doi:10.1007/s11434-006-1152-y · Cited by 60 · see citing works
Gautelier, M., Jacques Schott, A., & Oelkers, É. H. (2007) · Chemical Geology · doi:10.1016/j.chemgeo.2007.05.008 · Cited by 59 · see citing works
Why is Dawsonite Absent in CO 2 Charged Reservoirs?
Hellevang, H., Declercq, J., & Aagaard, P. (2011) · Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles · doi:10.2516/ogst/2011002 · Cited by 59 · see citing works
“Moreover, precipitation rate experiments on minerals like magnesite (Saldi et al., 2009), calcite (Shiraki and Brantley, 1995), dolomite (Arvidson and Mackenzie, 1997, 1999) and quartz (Ganor et al., 2005) suggests that the reaction order of precipitation with respect to affinity of these minerals…”
BackgroundTowards understanding the origin of massive dolostones
Ning, M., Lang, X., Huang, K., Li, C., Huang, T., Yuan, H., Xing, C., Yang, R., & Shen, B. (2020) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2020.116403 · Cited by 58 · see citing works
Single-crystal plagioclase feldspar dissolution rates measured by vertical scanning interferometry
Arvidson, R. S., Beig, M. S., & Lüttge, A. (2004) · American Mineralogist · doi:10.2138/am-2004-0107 · Cited by 58 · see citing works
Self-citationFenter, P., Zhang, Z., Park, C., Sturchio, N. C., Hu, X., & Higgins, S. R. (2006) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2006.10.006 · Cited by 55 · see citing works
“Paradoxically, dolomite is relatively abundant in ancient sedimentary deposits (Arvidson and Mackenzie, 1999).”
BackgroundDolomite in caves: Recent dolomite formation in oxic, non-sulfate environments. Castañar Cave, Spain
Alonso‐Zarza, A. M., & Martín-Pérez, A. (2008) · Sedimentary Geology · doi:10.1016/j.sedgeo.2008.02.006 · Cited by 55 · see citing works
“Such dolomites, as those of the Castañar Cave, may provide information that will help resolve the “dolomite problem” (Land, 1998; Arvidson and Mackenzie, 1999) either through direct precipitation from the cave waters or by transformations frommetastable minerals, such as aragonite or huntite.”
Background
- Authors
- Arvidson, R. S.
- Affiliations
- University of Hawaiʻi at Mānoa (US)
- Corresponding author
- Arvidson, R. S.
- ORCID
- Arvidson, R. S.
- Venue
- American Journal of Science
- Publisher
- American Journal of Science (AJS)
- Published
- 1999-04-01
- Volume
- 299
- Issue
- 4
- Pages
- 257-288
- ISSN
- 0002-9599 (ISSN-L)
- OpenAlex
- W2017918382
- Semantic Scholar
- a7089a5eff292400fe9e9a919119e166bfc231c5
- Cited by
- 447
- References
- 43
- Citations by year
- 2026: 27 · 2025: 26 · 2024: 26 · 2023: 33 · 2022: 17 · 2021: 26 · 2020: 28 · 2019: 27 · 2018: 21 · 2017: 30 · 2016: 20 · 2015: 17 · 2014: 17 · 2013: 23 · 2012: 16
- FWCI
- 5.06
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- American Journal of Science (publishedVersion)
- Funders
- American Chemical Society Petroleum Research Fund
- Topics
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- dolomite problem, saturation index, temperature dependence, activation energy, Arrhenius rate constants, reaction order, protodolomite, syntaxial overgrowths, nucleation, dolomite origin, carbonate precipitation, seawater chemistry
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