中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 深海科学与工程研究所
  3. 中国科学院深海科学与工程研究所
  4. 深海科学研究部
  5. 地外海洋系统研究室
In situ oxidation of sulfide minerals supports widespread sulfate reducing bacteria in the deep subsurface of the Witwatersrand Basin (South Africa): Insights from multiple sulfur and oxygen isotopes

文献类型：期刊论文

作者Li, Long2; Wei, Siwen2; Lollar, Barbara Sherwood3; Wing, Boswell1,4; Bui, Thi H.1; Ono, Shuhei5; Vetter, Maggie C. Y. Lau6,7; Onstott, Tullis C.7; Kieft, Thomas L.8; Borgonie, Gaetan9
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2022
卷号577页码:12
关键词subsurface biosphere Witwatersrand Basin sulfide oxidation microbial sulfate reduction multiple sulfur isotopes oxygen isotopes
ISSN号0012-821X
DOI10.1016/j.epsl.2021.117247
通讯作者Li, Long
英文摘要Dissolved sulfate is a crucial electron acceptor for the subsurface biosphere, particularly for the living microbial ecosystems in the long-isolated (on the order of millions to billions of years) deep subsurface fracture waters in Precambrian cratons, e.g., in the Witwatersrand Basin of the Kaapvaal Craton, South Africa. Aiming to understand the role of sulfate in the sustainability of the subsurface habitat and the spatial extent of the terrestrial subsurface biosphere, we carried out a basin-scale examination on the sources and producing mechanisms of dissolved sulfur (sulfate and sulfide) in the subsurface fracture waters in the Witwatersrand Basin using multiple sulfur isotopes (S-32,S-33,S-34,S-36) and oxygen isotopes (O-16,O-18). Dissolved sulfates in14 fracture water samples collected from 900 to 3,413 meters below the surface at 6 sites show isotopic ranges from -5.3 parts per thousand to +19.4 parts per thousand for delta S-34, -0.40 parts per thousand to +0.50 parts per thousand for Delta S-33, and -1.1 parts per thousand to +10.9 parts per thousand for delta O-18. These isotopic signatures aredistinct to those of the sulfate minerals (e.g., the carbonate-associated sulfate in local Transvaal Supergroup dolomite sequences: delta S-34 =+31.4 parts per thousand to +39.2 parts per thousand; Delta S-33 =-0.01 parts per thousand to +0.16 parts per thousand), but identical to those of the sulfide minerals in the host rocks. This indicates that the dissolved sulfate in the fracture waters were dominantly generated by in situ oxidation of sulfide minerals at basin scale, although mixing of a small amount of surface sulfate at some sites cannot be completely ruled out. The dissolved sulfates inthe less deep and less saline fracture waters are in oxygen isotope disequilibrium with their host waters, a surprising result given that the water residence times are orders of magnitude longer than the time required for oxygen isotope exchange to reach equilibrium. This implies that vigorous in situ sulfate production has occurred after the fracture waters were isolated. In contrast, the dissolved sulfate in the deeper, more saline waters are in apparent oxygen isotope equilibration or close to equilibration with their host waters. This might be attributed to a combined effect of faster oxygen isotope exchange between sulfate and water at higher temperatures, larger extent of sulfate reduction, and/or less efficient sulfate production. The dissolved sulfide in the fracture waters has similar Delta S-33 values but is 3.0 parts per thousand to 26.4 parts per thousand lower in delta S-34 than coexisting sulfate, suggesting that the dissolved sulfide is mostly generated from bacterial sulfate reduction, which is consistent with the widespread existence of sulfate-reducing bacteria down to > 3.4 km below surface in the Witwatersrand Basin. Overall, these novel isotopic results demonstrate that geological processes can provide a steady long-term sulfate source in deep fracture fluids by in situ oxidation of sulfide minerals in their host rocks, and thereby a mechanism to sustain the terrestrial subsurface biosphere, even in deep high-temperature, long-isolated water systems. Thus, sulfate as a terminal electron acceptor is not the limiting factor for the spatial expansion of terrestrial subsurface biosphere. (C) 2021 Elsevier B.V. All rights reserved.
WOS关键词ACIDITHIOBACILLUS-FERROOXIDANS ; MESOARCHEAN WITWATERSRAND ; FRACTURE WATER ; NOBLE-GASES ; PYRITE ; ORIGIN ; GEOCHEMISTRY ; CONSTRAINTS ; DIVERSITY ; REDUCTION
资助项目Sloan Foundation -Deep Carbon Observatory -Deep Life and Deep Energy projects ; NSERC
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000712266100005
出版者ELSEVIER
资助机构Sloan Foundation -Deep Carbon Observatory -Deep Life and Deep Energy projects ; NSERC
源URL[http://ir.idsse.ac.cn/handle/183446/9417]  
专题深海科学研究部_地外海洋系统研究室
通讯作者Li, Long
作者单位1.McGill Univ, Dept Earth & Planetary Sci & GEOTOP, Montreal, PQ, Canada
2.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB, Canada
3.Univ Toronto, Dept Earth Sci, Toronto, ON, Canada
4.Univ Colorado, Geol Sci, Boulder, CO 80309 USA
5.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA
6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Hainan, Peoples R China
7.Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA
8.New Mexico Inst Min & Technol, Dept Biol, Socorro, NM 87801 USA
9.Extreme Life Isyensya, Gentbrugge, Belgium
10.Univ Free State, Dept Microbial Biochem & Food Biotechnol, Bloemfontein, South Africa
推荐引用方式
GB/T 7714		 Li, Long,Wei, Siwen,Lollar, Barbara Sherwood,et al. In situ oxidation of sulfide minerals supports widespread sulfate reducing bacteria in the deep subsurface of the Witwatersrand Basin (South Africa): Insights from multiple sulfur and oxygen isotopes[J]. EARTH AND PLANETARY SCIENCE LETTERS,2022,577:12.
APA Li, Long.,Wei, Siwen.,Lollar, Barbara Sherwood.,Wing, Boswell.,Bui, Thi H..,...&van Heerden, Esta.(2022).In situ oxidation of sulfide minerals supports widespread sulfate reducing bacteria in the deep subsurface of the Witwatersrand Basin (South Africa): Insights from multiple sulfur and oxygen isotopes.EARTH AND PLANETARY SCIENCE LETTERS,577,12.
MLA Li, Long,et al."In situ oxidation of sulfide minerals supports widespread sulfate reducing bacteria in the deep subsurface of the Witwatersrand Basin (South Africa): Insights from multiple sulfur and oxygen isotopes".EARTH AND PLANETARY SCIENCE LETTERS 577(2022):12.

入库方式： OAI收割

来源：深海科学与工程研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。