globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.09.036
Scopus记录号: 2-s2.0-85054446512
论文题名:
Triple sulfur isotope relationships during sulfate-driven anaerobic oxidation of methane
作者: Gong S.; Peng Y.; Bao H.; Feng D.; Cao X.; Crockford P.W.; Chen D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 504
起始页码: 13
结束页码: 20
语种: 英语
英文关键词: anaerobic methane oxidation ; cold seeps barite ; Gulf of Mexico ; isotope fractionation ; multiple sulfur isotopes ; reaction–transport model
Scopus关键词: Anaerobic digestion ; Barite ; Budget control ; Methane ; Oxidation ; Sedimentary rocks ; Sedimentology ; Sulfur compounds ; Water ; Anaerobic methane oxidations ; Cold seeps ; Gulf of Mexico ; Isotope fractionation ; Multiple sulfur isotopes ; Transport modeling ; Isotopes
英文摘要: Sulfate-driven anaerobic oxidation of methane (SD-AOM) plays a critical role in regulating the global methane budget. Determination of the diagnostic triple isotope exponent θ33 (≡ln33⁡α/ln34⁡α) for SD-AOM can help to identify and quantify microbial sulfate reduction via SD-AOM in the environment. The history of Earth's surface redox conditions can also be examined through the measurement of triple sulfur isotope compositions in sedimentary rocks. Due to difficulties in both culturing anaerobic methanotrophs and sampling pore-water sulfate in SD-AOM-dominated environments, however, the θ33 values for the processes of SD-AOM have not been constrained. We propose that a set of modern cold-seep associated barite samples with low Δδ18O/Δδ34S values bear a record of residual pore-water sulfate during SD-AOM, and therefore the triple sulfur isotope composition of these barites can be used to deduce θ33 values. We applied a 1-D diagenetic reaction–transport model to fit Δ33S and δ′34S results from modern cold seep barites collected from five sites in the Gulf of Mexico. Based on revealed negative correlations (R2=0.77) between Δ33S and δ′34S values we calculated an upper-limit θ33 value of 0.5100 to 0.5112 (±0.0005) given a 1000ln34⁡α value of −30‰ to −10‰. This θ33 value is distinctively lower than that of organoclastic sulfate reduction (OSR) in marine environments where the diagnostic isotope fractionation (1000ln34⁡α) is typically more negative than that of SD-AOM. In addition, cold seep barite data display a negative Δ33S–δ′34S correlation whereas pore-water sulfates of all OSR-dominated settings show a positive one. Therefore, the diagnostic triple-sulfur isotope exponent and associated negative Δ33S–δ′34S correlation may allow for the identification of SD-AOM in sedimentary records. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109605
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China; Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; Department of Geoscience, Princeton University, Princeton, NJ 08544, United States; Hadal Science and Technology Research Center, College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China; University of Chinese Academy of Sciences, Beijing, 100049, China

Recommended Citation:
Gong S.,Peng Y.,Bao H.,et al. Triple sulfur isotope relationships during sulfate-driven anaerobic oxidation of methane[J]. Earth and Planetary Science Letters,2018-01-01,504
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