The influence of organic matter in organogenic dolomitization
Abstract
We hypothesize that the decomposition of organic debris derived from plants, planktonic animals, and algae by sulfate-reducing bacteria, and specifically by the enzymatic degradation of protein, is vital to organogenic dolomitization. The role of this degradation is to increase both alkalinity and pH of the pore waters, providing the necessary solution and surface chemistries for dolomitization to occur. Ammonia, derived by the enzymatic breakdown of proteins, is the only simple base available to supply the pH conditions necessary for dolomitization. Protein is abundant in organic matter derived from a marine source. Because of the large enthalpies of hydration of Mg (super +2) and Ca (super +2) ions, we propose that dolomitization proceeds with the transfer of neutral ion pairs, CaCO 30 and MgCO 30 , to and from the dolomite surface within a replacement zone. For this reason, dolomitization will occur only when the concentration of the CO 3 (super -2) ion is high and in large excess to the HCO 3 (super -) ion in solution and at the carbonate crystal surface. These conditions will be met when the pH and/or ionic strength is high and the carbonate alkalinity is also high.
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The main kinetic factors that inhibit the nucleation or precipitation of dolomite at low temperatures are the high hydration energy of the magnesium ion, the presence of sulfate (even in very low concentrations) related to the formation of complex MgSO4^0, and the low activity of CO3 in most natural solutions.
“the main kinetic factors that inhibit the nucleation or precipitation of dolomite at low temperatures are thought to include: (1) the high hydration energy of the magnesium ion [22,45,51,66,[74][75][76][77][78][79][80]; (2) the presence of sulfate (even in very low concentrations), related to the formation of complex MgSO 4 0 [32,74,81,82]; and (3) the low activity of CO 2- 3 in most natural solut”
From Thermodynamic and Kinetic Studies of Dolomite Formation: A Review (2023) · cites this paper as [74]
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- Authors
- Slaughter, M., & Hill, R. J.
- Affiliations
- Colorado School of Mines (US)
- Venue
- Journal of Sedimentary Research
- Publisher
- Society for Sedimentary Geology
- Published
- 1991-03-01
- Volume
- 61
- Issue
- 2
- Pages
- 296-303
- ISSN
- 0022-4472 (ISSN-L)
- 1938-3681
- 1527-1404
- OpenAlex
- W2168301466
- Cited by
- 124
- References
- 0
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 2 · 2023: 9 · 2022: 7 · 2021: 4 · 2020: 5 · 2019: 8 · 2018: 3 · 2017: 5 · 2016: 3 · 2015: 3 · 2014: 2 · 2013: 4 · 2012: 8
- FWCI
- 1.25
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Sedimentary Research (publishedVersion)
- Funders
- Japan Society for the Promotion of Science
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
- Keywords
- organic matter, sulfate-reducing bacteria, protein degradation, ammonia, pore water pH, carbonate alkalinity, dolomite replacement, calcium carbonate, magnesium carbonate, carbonate ions, bicarbonate, ionic strength
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