Formation mechanism of authigenic gypsum in marine methane hydrate settings: Evidence from the northern South China Sea
Lin, Qi; Wang, Jiasheng; Algeo, Thomas J.; Su, Pibo; Hu, Gaowei; Wang, JS (reprint author), State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China.
2016
发表期刊DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷号115页码:210-220
摘要During the last decade, gypsum has been discovered widely in marine methane hydrate-bearing sediments. However, whether this gypsum is an in-situ authigenic precipitate remains controversial. The GMGS2 expedition carried out in 2013 by the Guangzhou Marine Geological Survey (GMGS) in the northern South China Sea provided an excellent opportunity for investigating the formation of authigenic minerals and, in particular, the relationship between gypsum and methane hydrate. In this contribution, we analyzed the morphology and sulfur isotope composition of gypsum and authigenic pyrite as well as the carbon and oxygen isotopic compositions of authigenic carbonate in a drillcore from Site GMGS2-08. These methane-derived carbonates have characteristic carbon and oxygen isotopic compositions (delta C-13: -57.9% to -27.3%. VPDB; delta O-18: +1.0%. to +3.8% VPDB) related to upward seepage of methane following dissociation of underlying methane hydrates since the Late Pleistocene. Our data suggest that gypsum in the sulfate-methane transition zone (SMTZ) of this core precipitated as in-situ authigenic mineral. Based on its sulfur isotopic composition, the gypsum sulfur is a mixture of sulfate derived from seawater and from partial oxidation of authigenic pyrite. Porewater Ca2+ ions for authigenic gypsum were likely generated from carbonate dissolution through acidification produced by oxidation of authigenic pyrite and ion exclusion during methane hydrate formation. This study thus links the formation mechanism of authigenic gypsum with the oxidation of authigenic pyrite and evolution of underlying methane hydrates. These findings suggest that authigenic gypsum may be a useful proxy for recognition of SMTZs and methane hydrate zones in modern and ancient marine methane hydrate geo-systems. (C) 2016 Elsevier Ltd. All rights reserved.
部门归属[Lin, Qi; Wang, Jiasheng; Algeo, Thomas J.] State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China; [Lin, Qi; Wang, Jiasheng] China Univ Geosci, Sch Earth Sci, Wuhan 430074, Hubei, Peoples R China; [Lin, Qi] Natl Inst South China Sea Studies, Haikou 571100, Hainan, Peoples R China; [Algeo, Thomas J.] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China; [Algeo, Thomas J.] Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA; [Su, Pibo] Guangzhou Marine Geol Survey, Guangzhou 510769, Guangdong, Peoples R China; [Hu, Gaowei] Qingdao Inst Marine Geol, Qingdao 266071, Shandong, Peoples R China
关键词Authigenic Pyrite Sulfur Isotope Methane Seepage Sulfate-methane Transition Zone Gmgs2 Expedition
学科领域Oceanography
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15340
专题广东省应用海洋生物学重点实验室
通讯作者Wang, JS (reprint author), State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China.
推荐引用方式
GB/T 7714
Lin, Qi,Wang, Jiasheng,Algeo, Thomas J.,et al. Formation mechanism of authigenic gypsum in marine methane hydrate settings: Evidence from the northern South China Sea[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2016,115:210-220.
APA Lin, Qi,Wang, Jiasheng,Algeo, Thomas J.,Su, Pibo,Hu, Gaowei,&Wang, JS .(2016).Formation mechanism of authigenic gypsum in marine methane hydrate settings: Evidence from the northern South China Sea.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,115,210-220.
MLA Lin, Qi,et al."Formation mechanism of authigenic gypsum in marine methane hydrate settings: Evidence from the northern South China Sea".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 115(2016):210-220.
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