Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea

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	Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea
	Li, Niu; Feng, Dong; Chen, Linying; Wang, Hongbin; Chen, Duofu
刊名	MARINE AND PETROLEUM GEOLOGY
	2016
卷号	77 页码:835-845
关键词	Cold seep Anaerobic oxidation of methane Sulfur isotope South China Sea
通讯作者	Feng, D (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China. ; Chen, DF (reprint author), Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China.
中文摘要	Release of methane from the seafloor throughout the world's oceans and the biogeochemical processes involved may have significant effects on the marine sedimentary environment. Identification of such methane release events in marine sediment records can hence provide a window into the magnitude of ancient seeps. Here, we report on analysis of the geochemical composition of samples in a 12.3 m long sediment core (DH-5) collected from a seep site in the South China Sea (SCS). Our aim has been to investigate whether the evidence for the presence of methane release event within sediments is discernible from solid-phase sediment geochemistry. We show that sedimentary total sulfur (TS), delta S-34 values of chromium reducible sulfur (delta(34)ScRs) along with total organic carbon (TOC) and total inorganic carbon (TIC) content can be used to infer the presence of methane release events in cold seep settings. At least three methane release events were identified in the studied core (Unit I at 400-550 cm, Unit II at 740-820 cm, and Unit III at 1000-1150 cm). According to the characteristic of redox-sensitive elements (eg., Mo, U and Mn), we suggest that methane flux has been changed from relatively high (Unit I) to low (Unit II and III) rates. This inference is supported by the coupled occurrence of S-34-enriched sulfides in Unit II and III. AMS C-14 dates from planktonic foraminifera in Unit I suggest that high methane flux event occurred at similar to 15.4-24.8 kyr BP, which probably resulted in locally-focused aerobic methane oxidation. Overall, our results suggest that TS, TOC, TIC and delta(34)ScRs have potential for identifying present and fossil methane release events in marine sediments. (C) 2016 Elsevier Ltd. All rights reserved.
学科主题	Geology
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15314]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Li, Niu,Feng, Dong,Chen, Linying,et al. Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2016,77:835-845.
APA	Li, Niu,Feng, Dong,Chen, Linying,Wang, Hongbin,&Chen, Duofu.(2016).Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea.MARINE AND PETROLEUM GEOLOGY,77,835-845.
MLA	Li, Niu,et al."Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea".MARINE AND PETROLEUM GEOLOGY 77(2016):835-845.