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Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply
Peng, Xiaotong1; Guo, Zixiao1,2; Chen, Shun1; Sun, Zhilei3; Xu, Hengchao1; Ta, Kaiwen1; Zhang, Jianchao4; Zhang, Lijuan5; Li, Jiwei1; Du, Mengran1; Guo Zixiao
2017-05-15
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
Volume205Pages:1-13
AbstractThe 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.
SubtypeArticle
KeywordCarbonate Pipe Sulfate-driven Aom Pyrite Fe-driven Aom Okinawa Trough
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.gca.2017.02.010
Indexed BySCI
Language英语
WOS KeywordANAEROBIC METHANE OXIDATION ; SOUTH CHINA SEA ; GULF-OF-MEXICO ; COLD-SEEP CARBONATES ; BLACK-SEA ; AUTHIGENIC CARBONATES ; CONTINENTAL-SLOPE ; SEDIMENTARY PYRITE ; MARINE-SEDIMENTS ; ISOTOPE ANALYSIS
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000402487700001
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/2379
Collection深海科学研究部_深海地质与地球化学研究室
研究生部
Corresponding AuthorPeng, Xiaotong
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Deep Sea Sci Div, Sanya 572000, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Minist Land & Resources, Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
4.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Shanghai Synchrotron Radiat Facil, Shanghai Inst Appl Phys, Shanghai 219250, Peoples R China
Recommended Citation
GB/T 7714
Peng, Xiaotong,Guo, Zixiao,Chen, Shun,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 Peng, Xiaotong.,Guo, Zixiao.,Chen, Shun.,Sun, Zhilei.,Xu, Hengchao.,...&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 Peng, Xiaotong,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.
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