globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12227
Scopus记录号: 2-s2.0-85011372901
论文题名:
Sulphur cycling in a Neoarchaean microbial mat
作者: Meyer N.R.; Zerkle A.L.; Fike D.A.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:3
起始页码: 353
结束页码: 365
语种: 英语
Scopus关键词: Archean ; diagenesis ; geological record ; isotopic fractionation ; microbial mat ; petrography ; pyrite ; reduction ; sulfur cycle ; sulfur isotope ; thermochemistry ; South Africa ; iron ; pyrite ; sulfide ; sulfur ; chemistry ; fossil ; geology ; mass spectrometry ; metabolism ; microbiology ; sediment ; South Africa ; Fossils ; Geologic Sediments ; Geology ; Iron ; Mass Spectrometry ; South Africa ; Sulfides ; Sulfur ; Sulfur Isotopes
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Multiple sulphur (S) isotope ratios are powerful proxies to understand the complexity of S biogeochemical cycling through Deep Time. The disappearance of a sulphur mass-independent fractionation (S-MIF) signal in rocks <~2.4 Ga has been used to date a dramatic rise in atmospheric oxygen levels. However, intricacies of the S-cycle before the Great Oxidation Event remain poorly understood. For example, the isotope composition of coeval atmospherically derived sulphur species is still debated. Furthermore, variation in Archaean pyrite δ34S values has been widely attributed to microbial sulphate reduction (MSR). While petrographic evidence for Archaean early-diagenetic pyrite formation is common, textural evidence for the presence and distribution of MSR remains enigmatic. We combined detailed petrographic and in situ, high-resolution multiple S-isotope studies (δ34S and Δ33S) using secondary ion mass spectrometry (SIMS) to document the S-isotope signatures of exceptionally well-preserved, pyritised microbialites in shales from the ~2.65-Ga Lokammona Formation, Ghaap Group, South Africa. The presence of MSR in this Neoarchaean microbial mat is supported by typical biogenic textures including wavy crinkled laminae, and early-diagenetic pyrite containing <26‰ μm-scale variations in δ34S and Δ33S = −0.21 ± 0.65‰ (±1σ). These large variations in δ34S values suggest Rayleigh distillation of a limited sulphate pool during high rates of MSR. Furthermore, we identified a second, morphologically distinct pyrite phase that precipitated after lithification, with δ34S = 8.36 ± 1.16‰ and Δ33S = 5.54 ± 1.53‰ (±1σ). We propose that the S-MIF signature of this secondary pyrite does not reflect contemporaneous atmospheric processes at the time of deposition; instead, it formed by the influx of later-stage sulphur-bearing fluids containing an inherited atmospheric S-MIF signal and/or from magnetic isotope effects during thermochemical sulphate reduction. These insights highlight the complementary nature of petrography and SIMS studies to resolve multigenerational pyrite formation pathways in the geological record. © 2017 The Authors Geobiology Published by John Wiley & Sons Ltd.
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被引频次[WOS]:16   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85056
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Earth and Environmental Sciences, University of St Andrews, St Andrews, United Kingdom; Department of Earth and Planetary Sciences, Washington University, St. Louis, MO, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States

Recommended Citation:
Meyer N.R.,Zerkle A.L.,Fike D.A.. Sulphur cycling in a Neoarchaean microbial mat[J]. Geobiology,2017-01-01,15(3)
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