Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea

doi:10.1016/j.orggeochem.2015.11.007

GIEC OpenIR > 中国科学院广州能源研究所

	Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea
	Guan, Hongxiang 1; Feng, Dong 2; Wu, Nengyou 1; Chen, Duofu 2
	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.
文章类型	Article
关键词	Biomarkers Cold Seep Authigenic Carbonate Stable Isotopes Methane Seepage Intensity South China Sea
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1016/j.orggeochem.2015.11.007
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	GULF-OF-MEXICO ; SULFATE-REDUCING BACTERIA ; ANAEROBIC OXIDATION ; GAS HYDRATE ; LIPID BIOMARKER ; COLD SEEPS ; BLACK-SEA ; TETRAETHER LIPIDS ; CONTINENTAL-SLOPE ; STABLE CARBON
收录类别	SCI
语种	英语
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000366706100011
引用统计	被引频次：33[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/10926
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
推荐引用方式 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.(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.