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Geochemical record of methane seepage in authigenic carbonates and surrounding host sediments: A case study from the South China Sea
Hu, Y; Chen, LY; Feng, D; Liang, QY; Xia, Z; Chen, DF; feng@scsio.ac.cn; dfchen@shou.edu.cn
2017
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume138Pages:51-61
AbstractSediments at marine methane seep sites provide potential archives of past fluid flow that serve to explore seepage activities over time. Three gravity cores (D-8, D-F, and D-7) were collected from seep sites on the northern slope of the South China Sea where gas hydrates were drilled in the subsurface. Various carbon and sulfur contents, delta C-13 values of total inorganic carbon (delta C-13(TIC)), delta S-34 values of chromium reducible sulfur (delta S-34(CRS)), trace element contents, grain size, and AMS C-14 dating of planktonic Foraminifera in the sediments were determined to explore the availability of related proxies at seeps and to trace past methane seepage activities. Evidence for the presence of methane seepage and consequently anaerobic oxidation of methane comes from the occurrence of C-13-depleted authigenic carbonate nodules (delta C-13 values as low as -49 parts per thousand) discovered at an interval of 150-200 cm in core D-7. This finding is supported by high S/C ratios and molybdenum enrichment in the same interval. However, low contents of CRS and negative delta S-34(CRS) values are present. It is suggested to reflect a transient methane seepage event, which continued for about 1 ka based on the C-14 ages. Cores D-8 and D-F have delta C-13(TIC) values close to zero, low S/C ratios and CRS contents, negative delta S-34(CRS) values, and no trace element enrichment, suggesting a negligible impact of methane-seepage on the sediments. The negative delta S-34(CRS) values of the studied seep impacted and background sediments suggest that the application of delta S-34(CRS) alone as a proxy to identify AOM-related process may be insufficient. Sediment carbon-sulfur-trace element systematics and 14C ages used here have the potential to be a promising tool to recognize transient methane seepages and constrain their timescales. (C) 2017 Elsevier Ltd. All rights reserved.
Department[Hu, Yu; Chen, Linying; Chen, Duofu] Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China; [Feng, Dong] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Liang, Qianyong; Xia, Zhen] China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 510740, Guangdong, Peoples R China
KeywordMethane Seepage Sediment Authigenic Carbonate Carbon Chromium Reducible Sulfur Trace Element South China Sea
Funding ProjectMSG
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/16491
Collection中科院边缘海地质重点实验室
Corresponding Authorfeng@scsio.ac.cn; dfchen@shou.edu.cn
Recommended Citation
GB/T 7714
Hu, Y,Chen, LY,Feng, D,et al. Geochemical record of methane seepage in authigenic carbonates and surrounding host sediments: A case study from the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,138:51-61.
APA Hu, Y.,Chen, LY.,Feng, D.,Liang, QY.,Xia, Z.,...&dfchen@shou.edu.cn.(2017).Geochemical record of methane seepage in authigenic carbonates and surrounding host sediments: A case study from the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,138,51-61.
MLA Hu, Y,et al."Geochemical record of methane seepage in authigenic carbonates and surrounding host sediments: A case study from the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 138(2017):51-61.
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