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Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply

文献类型：期刊论文

作者Chen, Shun5; Sun, Zhilei1; Xu, Hengchao5; Ta, Kaiwen5; Zhang, Jianchao4; Zhang, Lijuan3; Li, Jiwei5; Du, Mengran5; Guo Zixiao; Peng, Xiaotong5
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2017-05-15
卷号205页码:1-13
关键词Carbonate Pipe Sulfate-driven Aom Pyrite Fe-driven Aom Okinawa Trough
DOI10.1016/j.gca.2017.02.010
文献子类Article
英文摘要The microbial anaerobic oxidation of methane (AOM), a key biogeochemical process that consumes substantial amounts of methane produced in seafloor sediments, can lead to the formation of carbonate deposits at or beneath the sea floor. Although Fe oxide-driven AOM has been identified in cold seep sediments, the exact mode by which it may influence the formation of carbonate deposits remains poorly understood. Here, we characterize the morphology, petrology and geochemistry of a methane-derived Fe-rich carbonate pipe in the northern Okinawa Trough (OT). We detect abundant authigenic pyrites, as well as widespread trace Fe, within microbial mat-like carbonate veins in the pipe. The in situ delta S-34 values of these pyrites range from - 3.9 to 31.6% (VCDT), suggesting a strong consumption of seawater sulfate by sulfate-driven AOM at the bottom of sulfate reduction zone. The positive d 56 Fe values of pyrite and notable enrichment of Fe in the OT pipe concurrently indicate that the pyrites are primarily derived from Fe oxides in deep sediments. We propose that the Fe-rich carbonate pipe formed at the bottom of sulfate reduction zone, below which Fe-driven AOM, rather than Fe-oxide reduction coupled to organic matter degradation, might be responsible for the abundantly available Fe(2+)in the fluids from which pyrites precipitated. The Fe-rich carbonate pipe described in this study probably represents the first fossil example of carbonate deposits linked to Fe-driven AOM. Because Fe-rich carbonate deposits have also been found at other cold seeps worldwide, we infer that similar processes may play an essential role in biogeochemical cycling of sub-seafloor methane and Fe at continental margins. (C) 2017 Elsevier Ltd. All rights reserved.
WOS关键词ANAEROBIC METHANE OXIDATION ; SOUTH CHINA SEA ; GULF-OF-MEXICO ; COLD-SEEP CARBONATES ; BLACK-SEA ; AUTHIGENIC CARBONATES ; CONTINENTAL-SLOPE ; SEDIMENTARY PYRITE ; MARINE-SEDIMENTS ; ISOTOPE ANALYSIS
语种英语
WOS记录号WOS:000402487700001
版本出版稿
源URL[http://ir.idsse.ac.cn/handle/183446/2379]  
专题深海科学研究部_深海地质与地球化学研究室
研究生部
通讯作者Guo Zixiao
作者单位1.Minist Land & Resources, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Shanghai Synchrotron Radiat Facil, Shanghai Inst Appl Phys, Shanghai 219250, Peoples R China
4.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Shun,Sun, Zhilei,Xu, Hengchao,et al. Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2017,205:1-13.
APA Chen, Shun.,Sun, Zhilei.,Xu, Hengchao.,Ta, Kaiwen.,Zhang, Jianchao.,...&Guo, Zixiao.(2017).Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply.GEOCHIMICA ET COSMOCHIMICA ACTA,205,1-13.
MLA Chen, Shun,et al."Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply".GEOCHIMICA ET COSMOCHIMICA ACTA 205(2017):1-13.

入库方式： OAI收割

来源：深海科学与工程研究所

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