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Extremely variable sulfur isotopic compositions of pyrites in carbonate pipes from the northern south China sea: Implications for a non-steady microenvironment

文献类型：期刊论文

作者Guo, Zixiao1,3,4; Liu, Ya-Dong1; Qin, Guohong1; Hu, Yongjie2; Peng, Xiaotong4
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2022-12-01
卷号146页码:6
ISSN号0264-8172
关键词Sulfur isotopic compositions Pyrites Microenvironment Carbonate pipes South China Sea
DOI10.1016/j.marpetgeo.2022.105972
通讯作者Liu, Ya-Dong(ydliu@hebtu.edu.cn) ; Peng, Xiaotong(xtpeng@idsse.ac.cn)
英文摘要To further constrain the microenvironment during the growth of carbonate pipes at cold seeps, we present the whole-rock carbon and oxygen, and in situ pyrite sulfur isotopic compositions along the cross-sections in pyritebearing carbonate pipes from the northern South China Sea. The whole-rock geochemical data suggest that these carbonate pipes were formed in an anoxic and methane-rich environment. Furthermore, in situ delta S-34 values in pyrites across the carbonate pipe display an extremely wide range on a centimetre scale. The majority of pyrites have delta S-34 values ranging from 19.4 parts per thousand to 45.8 parts per thousand, reflecting the dominance of sulfate-driven anaerobic oxidation of methane (AOM) at and below the sulfate methane transition zone (SMTZ). Two abnormal areas show heavier or lighter delta S-34 values than the majority of pyrites, respectively. Pyrites in the abnormal area I have delta S-34 values ranging from 62.2 parts per thousand to 130.3 parts per thousand, suggesting an extremely S-34-enriched microenvironment produced via Rayleigh fractionation of limited sulfate in a closed system. The model calculation indicates that the maximum positive delta S-34 value could be produced when similar to 93% sulfate is consumed. Pyrites in the abnormal area II have delta S-34 values ranging from 32.7 parts per thousand to 18.0 parts per thousand, and are interpreted as a result of early organiclastic sulfate reduction with a low proportion of later sulfate-driven AOM above the SMTZ. Collectively, the extreme variations in delta S-34 values point to locally migrating SMTZ in a non-steady microenvironment during the growth of carbonate pipes. This study reveals that the in situ pyrite delta S-34 value is a diagnostic tool for tracing the change in the local microenvironment, and could be a step towards a more comprehensive picture of biogeochemical cycles at continental margins.
WOS关键词AUTHIGENIC CARBONATES ; SULFATE REDUCTION ; PORE FLUIDS ; METHANE ; ENVIRONMENTS ; SEAWATER ; HYDRATE
资助项目Science and Technology Project of Hebei Education Department[QN2020176] ; Natural Science Foundation of Hebei Province[D2020205007] ; Science Foundation of Hebei Normal University[L2020B24] ; Science Foundation of Hebei Normal University[L2021B21]
WOS研究方向Geology
语种英语
出版者ELSEVIER SCI LTD
WOS记录号WOS:000876370200001
资助机构Science and Technology Project of Hebei Education Department ; Natural Science Foundation of Hebei Province ; Science Foundation of Hebei Normal University
源URL[http://ir.idsse.ac.cn/handle/183446/9801]  
专题专家咨询委员会
通讯作者Liu, Ya-Dong; Peng, Xiaotong
作者单位1.Hebei Normal Univ, Sch Geog Sci, Hebei Key Lab Environm Change & Ecol Construct, Shijiazhuang 050024, Peoples R China
2.Sinopec Int Petr Explorat & Prod Corp, Beijing 100029, Peoples R China
3.UCL, Dept Earth Sci, London WC1E 6BT, England
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Zixiao,Liu, Ya-Dong,Qin, Guohong,et al. Extremely variable sulfur isotopic compositions of pyrites in carbonate pipes from the northern south China sea: Implications for a non-steady microenvironment[J]. MARINE AND PETROLEUM GEOLOGY,2022,146:6.
APA Guo, Zixiao,Liu, Ya-Dong,Qin, Guohong,Hu, Yongjie,&Peng, Xiaotong.(2022).Extremely variable sulfur isotopic compositions of pyrites in carbonate pipes from the northern south China sea: Implications for a non-steady microenvironment.MARINE AND PETROLEUM GEOLOGY,146,6.
MLA Guo, Zixiao,et al."Extremely variable sulfur isotopic compositions of pyrites in carbonate pipes from the northern south China sea: Implications for a non-steady microenvironment".MARINE AND PETROLEUM GEOLOGY 146(2022):6.

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来源：深海科学与工程研究所

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