globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12268
Scopus记录号: 2-s2.0-85037989094
论文题名:
Multiple sulfur isotope constraints on microbial sulfate reduction below an Archean seafloor hydrothermal system
作者: Aoyama S.; Ueno Y.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期:2
起始页码: 107
结束页码: 120
语种: 英语
Scopus关键词: Archean ; basalt ; comparative study ; hydrothermal system ; isotopic fractionation ; komatiite ; microbial activity ; reduction ; seafloor ; sulfate ; sulfide (inorganic) ; sulfide group ; sulfur isotope ; Australia ; North Pole Dome ; Pilbara Block ; Western Australia
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: Microbial sulfate reduction is among the most ubiquitous metabolic processes on earth. The oldest evidence of microbial sulfate reduction appears in the ca. 3.5 Ga Dresser Formation in the North Pole area of Pilbara Craton in Western Australia. That evidence was found through analysis of quadruple sulfur isotopes of sulfate and sulfide minerals deposited on the seafloor. However, the activity of microbial sulfate reduction below the Archean seafloor remains poorly understood. Here, we report the quadruple sulfur isotopic compositions of sulfide minerals within hydrothermally altered seafloor basalt and less altered basaltic komatiite collected from the North Pole Dome area. The Δ33S values of the sulfide minerals were nonzero negative, suggesting that sulfate reduction occurred below the Archean seafloor. To constrain the substrate sulfate sources and sulfate reduction processes, we constructed a numerical model. Comparing the modeled and observed sulfur isotopes, we show that the substrate sulfate comprises seawater sulfate with a negative Δ33S anomaly and 34S-enriched sulfate with no anomalous Δ33S. The latter component probably represents sulfate produced by local hydrothermal processes. The maximum sulfur isotopic fractionation between the putative substrate sulfate and the observed sulfide minerals within the altered basalt and basaltic komatiite is 35‰, which is consistent with a microbial origin. Alternatively, thermochemical sulfate reduction may also produce sulfide. However, considering the hydrothermal temperature inferred from the metamorphic grade of the altered basalt, the sulfur isotopic fractionation produced by inorganic sulfate reduction is probably below 20‰. Collectively, larger fractionations imply the involvement of biological sulfate reduction processes, both in the hydrothermal system below the seafloor and in less altered subsurface settings. © 2017 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85014
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作者单位: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, Japan; Department of Subsurface Geobiological Analysis and Research (D-SUGAR), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Natsushima-cho, Yokosuka, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, Japan

Recommended Citation:
Aoyama S.,Ueno Y.. Multiple sulfur isotope constraints on microbial sulfate reduction below an Archean seafloor hydrothermal system[J]. Geobiology,2018-01-01,16(2)
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