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Lipid biomarker patterns of authigenic carbonates reveal fluid composition and seepage intensity at Haima cold seeps, South China Sea
Guan, Hongxiang1; Birgel, Daniel2; Peckmann, Joern2; Liang, Qianyong3; Feng, Dong1,4; Yang, Shengxiong3; Liang, Jinqiang3; Tao, Jun3; Wu, Nengyou1; Chen, Duofu1,5
2018
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume168Pages:163
AbstractAuthigenic carbonates retrieved from sites ROV1 and ROV2 of the Haima hydrocarbon seeps of the South China Sea at approximately 1390 m water depth were studied using lipid biomarker analyses. Abundant molecular fossils of anaerobic methane oxidizing archaea (ANME) and sulfate-reducing bacteria (SRB) with strong C-13-depletions (delta C-13 values as low as 126 parts per thousand), in combination with low delta C-13(carbonate) values (-42.7 parts per thousand to -36.8 parts per thousand), provide evidence that anaerobic oxidation of methane (AOM) was the major process driving the precipitation of the studied seep carbonates. The extremely low delta C-13 values of archaeal biomarkers confirm that biogenic methane was the main carbon source, but the seepage of accessory crude oil is also suggested by the presence of unresolved complex mixtures in the hydrocarbon fractions. A suite of C-13-depleted biomarkers indicate the predominance of ANME-1/DSS consortia at both sites, which indicates that the studied carbonates formed during low to medium methane flux. Somewhat higher contents of archaeal biomarkers and their stronger C-13-depletion at site ROV2 probably reflect at least temporarily higher seepage intensities than at site ROV1. Abundant bacterial dialkyl glycerol diethers (DAGEs), revealing a large offset of their delta C-13 values compared to SRB-derived terminally branched fatty acids, were possibly produced by distinct SRB species other than members of the DSS cluster. The encountered hopanoids are attributed to aerobic methanotrophic bacteria based on their moderate C-13-depletion. The application of molecular fossils in combination with their compound-specific isotope signatures is an efficient tool to reconstruct the composition of seepage fluids and seepage intensities.
DepartmentMSG
KeywordSouth China Sea Cold seeps Authigenic carbonates Lipid biomarkers Anaerobic oxidation of methane
DOI10.1016/j.jseaes.2018.04.035
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17671
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Univ Hamburg, Ctr Erdsyst Forsch & Nachhaltigkeit, Inst Geol, D-20146 Hamburg, Germany
4.Guangzhou Marine Geol Survey, MLR Key Lab Marine Mineral Resources, Guangzhou 510075, Guangdong, Peoples R China
5.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
6.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China
Recommended Citation
GB/T 7714
Guan, Hongxiang,Birgel, Daniel,Peckmann, Joern,et al. Lipid biomarker patterns of authigenic carbonates reveal fluid composition and seepage intensity at Haima cold seeps, South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:163, 172.
APA Guan, Hongxiang.,Birgel, Daniel.,Peckmann, Joern.,Liang, Qianyong.,Feng, Dong.,...&Chen, Duofu.(2018).Lipid biomarker patterns of authigenic carbonates reveal fluid composition and seepage intensity at Haima cold seeps, South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,168,163.
MLA Guan, Hongxiang,et al."Lipid biomarker patterns of authigenic carbonates reveal fluid composition and seepage intensity at Haima cold seeps, South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):163.
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