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Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea
Guan, Hongxiang; Feng, Dong; Wu, Nengyou; Chen, Duofu; Feng, D (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
2016
发表期刊ORGANIC GEOCHEMISTRY
卷号91页码:109-119
摘要Authigenic carbonate rocks from an active seep (Site F) located in the South China Sea (SCS) at a water depth of 1120 m were studied using mineralogical and lipid biomarker analyses. Carbonate mineral compositions, in specific samples, were predominantly aragonite, high-Mg calcite (HMC), or a mixture of both. Abundant C-13-depleted lipid biomarkers diagnostic for archaea provide evidence that anaerobic oxidation of methane (AOM), mediated by anaerobic methane oxidizing archaea (ANME) and their bacterial partners, are the major processes leading to formation of the carbonates. High Methane Index, dominance of ANME-2 assemblages and the predominant contribution of AOM-related biomarkers in the aragonitic carbonate point to the strong impact of AOM communities during its precipitation, which is likely caused by high seepage intensities. The relatively low Methane Index and abundant allochthonous input of the HMC carbonate are a result of the weak impact of AOM microbial communities under conditions of low methane seepage. Evidence for this interpretation also comes from relatively higher carbonate content, lesser contribution of allochthonous organic matter and lower pyrite content in the aragonitic carbonate than in the HMC carbonate. High concentrations of C-13-depleted hopanoids were observed in the aragonitic sample which may be a result of the intermittent presence of oxic conditions in an overall anoxic condition, possibly induced by changing seepage intensities. Our data suggests that lipid biomarkers in authigenic carbonate from seep sites can be helpful for improving assessments of the fluid dynamics in such a complex system. (C) 2015 Elsevier Ltd. All rights reserved.
部门归属[Guan, Hongxiang; Wu, Nengyou] Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China; [Feng, Dong; Chen, Duofu] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; 边缘海地质
关键词Biomarkers Cold Seep Authigenic Carbonate Stable Isotopes Methane Seepage Intensity South China Sea
学科领域Geochemistry & Geophysics
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15605
专题中科院边缘海地质重点实验室
通讯作者Feng, D (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China.
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GB/T 7714
Guan, Hongxiang,Feng, Dong,Wu, Nengyou,et al. Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea[J]. ORGANIC GEOCHEMISTRY,2016,91:109-119.
APA Guan, Hongxiang,Feng, Dong,Wu, Nengyou,Chen, Duofu,&Feng, D .(2016).Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea.ORGANIC GEOCHEMISTRY,91,109-119.
MLA Guan, Hongxiang,et al."Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea".ORGANIC GEOCHEMISTRY 91(2016):109-119.
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