Phase Equilibria in the System CaCO3-MgCO3-FeCO3
Abstract
Experimental data on phase relations in the CaCO3-MgCO3-FeCO3 ternary by Goldsmith et al. (1962) are inconsistent with those of Rosenberg (1967). These inconsistencies cannot be reconciled by the pressure or temperature differences between the two sets of experiments. Available reversed experiments on the binary systems have been re-evaluated to yield consistent binary solvi. These data have been combined with analyses of natural carbonates to yield approximate ternary phase diagrams at 250,400,550, and 700 °C, and 4 to model ternary activity/composition relations for calcite- and dolomite-structure carbonates. An empirical model for thermometry with calcite-ferroan dolomite was derived from the ternary solvus by fitting an empirical equation to the calcite limb of the ternary solvus. This model appears to extend reliably to higher iron contents than the models of Bickle * Powell (1977) and Powell et al. (1984).
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The theoretical trend predicted by Anovitz and Essene (1987) is for magnesite-siderite solid solutions to contain less CaCO3 as the formation temperature decreases, which is opposite to observations based on the analysis of low temperature (<100 °C) deposits.
“Interestingly, the theoretical trend predicted by Anovitz and Essene (1987) is for magnesite-siderite solid solutions to contain less CaCO 3 as the formation temperature decreases, which is opposite to observations based on the analysis of low temperature (<100 °C) deposits.”
From Inorganic synthesis of Fe–Ca–Mg carbonates at low temperature (2009) · cites this paper as Anovitz and Essene (1987)
Natural magnesite-siderite solid solutions show a significant incorporation of CaCO3 (up to 20 mol%) in their structures that is clearly outside the range of equilibrium values predicted by Anovitz and Essene (1987) for higher temperatures (e.g., 250 °C).
“Natural magnesite-siderite solid solutions show a significant incorporation of CaCO 3 (up to 20 mol%) in their structures that is clearly outside the”
From Inorganic synthesis of Fe–Ca–Mg carbonates at low temperature (2009) · cites this paper as Anovitz and Essene (1987)
Most of the precipitates in this study fall within the boundary defined by natural siderite formed below 100 °C, while fewer fall within the 250 °C field of siderite-magnesite solid solutions.
“Most of the precipitates in this study fall within the boundary defined by natural siderite formed below 100 °C while fewer fall within the 250 °C field of siderite-magnesite solid solutions (Anovitz and Essene, 1987).”
From Inorganic synthesis of Fe–Ca–Mg carbonates at low temperature (2009) · cites this paper as Anovitz and Essene, 1987
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Inorganic synthesis of Fe–Ca–Mg carbonates at low temperature
Romanek, C. S., Jiménez-López, C., Navarro, A. R., Sánchez-Román, M., Sahai, N., & Coleman, M. (2009) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2009.05.065 · Cited by 94 · see citing works
“%) in their structures that is clearly outside the Inorganic synthesis of Fe–Ca–Mg carbonates at low temperature 5363 range of equilibrium values predicted by Anovitz and Essene (1987) for higher temperatures (e.g., 250 C).”
BackgroundResultInfluentialZhang, F., Xu, H., Shelobolina, E. S., Konishi, H., Converse, B., Shen, Z., & Roden, E. E. (2015) · American Mineralogist · doi:10.2138/am-2015-4999 · Cited by 81 · see citing works
“…high Mg-calcite (space group: R3c) with more than 4 mol% and up to 35 mol% of MgCO3 according to the proposed solvus between calcite and dolomite (Anovitz and Essene 1987), disordered dolomite (with more than 35 mol% of MgCO3 and typically Ca-rich with disordered cations, i.e., instead of…”
BackgroundFang, Y., & Xu, H. (2019) · Journal of Sedimentary Research · doi:10.2110/jsr.2019.29 · Cited by 39 · see citing works
Zhang, F., Xu, H., Shelobolina, E. S., Konishi, H., & Roden, E. E. (2021) · American Mineralogist · doi:10.2138/am-2020-7381 · Cited by 30 · see citing works
- Authors
- ANOVITZ, L. M., & ESSENE, E. J.
- Affiliations
- University of Michigan (US)
- ORCID
- ANOVITZ, L. M.
- Venue
- Journal of Petrology
- Publisher
- Oxford University Press (OUP)
- Published
- 1987-04-01
- Volume
- 28
- Issue
- 2
- Pages
- 389-415
- ISSN
- 0022-3530 (ISSN-L)
- 1460-2415
- OpenAlex
- W2315620153
- Cited by
- 335
- References
- 0
- Citations by year
- 2026: 12 · 2025: 12 · 2024: 9 · 2023: 15 · 2022: 11 · 2021: 9 · 2020: 11 · 2019: 15 · 2018: 8 · 2017: 12 · 2016: 6 · 2015: 10 · 2014: 9 · 2013: 5 · 2012: 9
- FWCI
- 5.16
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Petrology (publishedVersion)
- Funders
- National Science Foundation
- University of Michigan
- Los Alamos National Laboratory
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Mineralogy and Gemology Studies
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- phase equilibria, ternary phase diagram, calcite, ferroan dolomite, activity-composition relations
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