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Authigenic minerals...
Authigenic minerals reflect microbial control on pore waters in a ferruginous analogue
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- Vuillemin, A. (author)
- GFZ German Research Centre for Geosciences, Section Geomicrobiology, Telegrafenberg, Potsdam, Germany
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- Morlock, Marina A. (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Institute of Geological Sciences, Oeschger Centre for Climate Change Research, University of Bern, Baltzerstrasse 1-3, Bern, Switzerland
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- Paskin, A. (author)
- GFZ German Research Centre for Geosciences, Section Interface Geochemistry, Telegrafenberg, Potsdam, Germany
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- Benning, L.G. (author)
- GFZ German Research Centre for Geosciences, Section Interface Geochemistry, Telegrafenberg, Potsdam, Germany; Department of Earth Sciences, Free University of Berlin, Berlin, Germany
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- Henny, C. (author)
- Research Center for Limnology and Water Resources, National Research and Innovation Agency (BRIN), Jawa Barat, Cibinong, Indonesia
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- Kallmeyer, J. (author)
- GFZ German Research Centre for Geosciences, Section Geomicrobiology, Telegrafenberg, Potsdam, Germany
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- Russell, J.M. (author)
- Department of Earth Environmental and Planetary Sciences, Brown University, 324 Brook Street, RI, Providence, United States
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- Vogel, H. (author)
- Institute of Geological Sciences, Oeschger Centre for Climate Change Research, University of Bern, Baltzerstrasse 1-3, Bern, Switzerland
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(creator_code:org_t)
- European Association of Geochemistry, 2023
- 2023
- English.
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In: Geochemical Perspectives Letters. - : European Association of Geochemistry. - 2410-339X .- 2410-3403. ; 28, s. 20-26
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https://umu.diva-por... (primary) (Raw object)
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Abstract
Subject headings
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- Ferruginous conditions prevailed in the oceans through much of Earth's history. However, minerals recording these conditions remain difficult to interpret in terms of biogeochemical processes prior to lithification. In Lake Towuti, Indonesia, ferruginous sediments are deposited under anoxic sulfate-poor conditions similar to the Proterozoic oceans, allowing the study of mineralogical (trans)formations during microbial diagenesis.Comprehensive pore water geochemistry, high resolution geochemical core profiles, and electron microscopy of authigenic minerals revealed in situ formation of magnetite, millerite, and abundant siderite and vivianite along a 100 m long sequence. Framboidal magnetites represent primary pelagic precipitates, whereas millerite, a sulfide mineral often overlooked under sulfate-poor conditions, shows acicular aggregates entangled with siderite and vivianite resulting from saturated pore waters and continuous growth during burial. These phases act as biosignatures of microbial iron and sulfate reduction, fermentation and methanogenesis, processes clearly traceable in pore water profiles.Variability in metal and organic substrates attests to environment driven processes, differentially sustaining microbial processes along the stratigraphy. Geochemical profiles resulting from microbial activity over 200 kyr after deposition provide constraints on the depth and age of mineral formation within ferruginous records.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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