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Paleo-cold seep activity in the southern South China Sea: Evidence from the geochemical and geophysical records of sediments
Li, Niu1; Yang, Xiaoqiang; Peng, Jie; Zhou, Qixian; Chen, Duofu2
2018
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume168Pages:106
AbstractOver the past decade more than 30 cold seep sites have been reported along the continental slope of the South China Sea (SCS). These seep sites have all been located in the northern SCS, and no methane seepage has been discovered in the southern SCS. Here, we report on the analysis results of the geochemical and geophysical of the marine core sediments (58S) collected from the southern continental slope of the SCS. We suggest that the sedimentary total sulfur (TS), total inorganic carbon (TIC), delta S-34(CRs) values of chromium reducible sulfur (CRS) and carbonate delta C-13(TIC) values of the bulk sediments, coupled with the ratio of (NRMAF60mT-NRMAF80mT)/NRM can be used to trace the methane release events in a methane-rich environment. At least two methane release events were identified at depths of 5.5-6.2 m and 6.8-7.2 m. Moreover, according to the characteristic of the TS/TOC and (NRMAF60mT-NRMAF80mT)/NFtM ratio of sediments, we suggest the methane flux has changed episodically. This inference is supported by the occurrence of the strongly negative carbonate delta C-13(TiC) values of bulk sediments and the positive delta S-34(CRS) values, which indicate the occurrence of anaerobic oxidation of methane (AOM) and the location of a past or present sulfate methane transition zone (SMTZ), respectively. Ultimately, these new data suggest that the combined geochemical and geophysical study of marine sediments provides a valuable tool with which to infer the temporal variations in methane seepage in a marine environment.
DepartmentMSG
KeywordCold seep Anaerobic oxidation of methane Sulfur isotope Southern South China Sea
DOI10.1016/j.jseaes.2017.10.022
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17667
Collection中科院边缘海地质重点实验室
Affiliation1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China
2.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
3.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China
Recommended Citation
GB/T 7714
Li, Niu,Yang, Xiaoqiang,Peng, Jie,et al. Paleo-cold seep activity in the southern South China Sea: Evidence from the geochemical and geophysical records of sediments[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:106, 111.
APA Li, Niu,Yang, Xiaoqiang,Peng, Jie,Zhou, Qixian,&Chen, Duofu.(2018).Paleo-cold seep activity in the southern South China Sea: Evidence from the geochemical and geophysical records of sediments.JOURNAL OF ASIAN EARTH SCIENCES,168,106.
MLA Li, Niu,et al."Paleo-cold seep activity in the southern South China Sea: Evidence from the geochemical and geophysical records of sediments".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):106.
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