Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply
Peng, XT; Guo, ZX; Chen, S; Sun, ZL; Xu, HC; Ta, KW; Zhang, JC; Zhang, LJ; Li, JW; Du, MR
2017
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
卷号205期号:-页码:1-13
文章类型期刊论文
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.
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
DOI10.1016/j.gca.2017.02.010
关键词[WOS]ANAEROBIC METHANE OXIDATION ; SOUTH CHINA SEA ; GULF-OF-MEXICO ; COLD-SEEP CARBONATES ; BLACK-SEA ; AUTHIGENIC CARBONATES ; CONTINENTAL-SLOPE ; SEDIMENTARY PYRITE ; MARINE-SEDIMENTS ; ISOTOPE ANALYSIS
收录类别SCI
语种英语
WOS记录号WOS:000402487700001
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/28665
专题中科院上海应用物理研究所2011-2018年
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Peng, XT,Guo, ZX,Chen, S,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, XT.,Guo, ZX.,Chen, S.,Sun, ZL.,Xu, HC.,...&Du, MR.(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, XT,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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