The role of thermochemical sulfate reduction in the origin of Mississippi Valley‐type deposits. I. Experimental results
Abstract
The kinetics of thermochemical sulfate reduction (TSR) were studied in experiments at 205–250°C, with determination of both sulfate and sulfide at intervals during the runs of up to 430 h. Analysis of the data indicates the reaction to have first‐order kinetics, and extrapolating these data, plus data from the literature, to 150°C gives a range of possible rate constants from 100 to 10−4 year−1. Although the rate law has not been well established, a reasonable estimate allows calculation of the amount of sulfide ore formed as a function of flow conditions and time. It is here concluded that TSR could happen during the formation of Mississippi Valley‐type ore deposits, subject to several caveats.
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The organic carbon released to the pore fluid by the dolomite-for-limestone replacement would reduce the aqueous sulfate to sulfide.
“This is because the organic carbon that is released to the pore fluid by the dolomite-forlimestone replacement would reduce the aqueous sulfate to sulfide, as suggested by Thom and Anderson (2008) and Anderson and Thom (2008).”
From Self-accelerating dolomite-for-calcite replacement: Self-organized dynamics of burial dolomitization and associated mineralization (2011) · cites this paper as Thom and Anderson (2008)
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Merino, E., & Canals, A. (2011) · American Journal of Science · doi:10.2475/07.2011.01 · Cited by 100 · see citing works
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Lappalainen, J., Baudouin, D., Hornung, U., Schuler, J., Melin, K., Bjelić, S., Vogel, F., Konttinen, J., & Joronen, T. (2020) · Energies · doi:10.3390/en13133309 · Cited by 87 · see citing works
Yuan, S., Chou, I.-M., Burruss, R. C., Wang, X., & Li, J. (2013) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2013.05.021 · Cited by 38 · see citing works
- Authors
- THOM, J., & ANDERSON, G. M.
- Affiliations
- University of British Columbia (CA)
- University of Toronto (CA)
- ORCID
- ANDERSON, G. M.
- Venue
- Geofluids
- Publisher
- Wiley
- Published
- 2007-11-19
- Volume
- 8
- Issue
- 1
- Pages
- 16-26
- ISSN
- 1468-8115 (ISSN-L)
- 1468-8123
- OpenAlex
- W2098780849
- Cited by
- 57
- References
- 0
- Citations by year
- 2026: 5 · 2025: 2 · 2024: 2 · 2023: 3 · 2022: 5 · 2021: 1 · 2020: 6 · 2019: 5 · 2018: 5 · 2017: 5 · 2016: 1 · 2015: 1 · 2014: 2 · 2013: 4
- FWCI
- 1.84
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Geofluids (publishedVersion)
- Funders
- Eidgenössische Technische Hochschule Zürich
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- 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
- Keywords
- thermochemical sulfate reduction, Mississippi Valley-type deposits, ore genesis, reaction kinetics, first-order kinetics, rate constants, sulfate reduction, hydrothermal fluids
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