Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea

doi:10.1007/s13131-019-1460-6

GIEC OpenIR

	Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea
	Sun, Tiantian 1,2; Wu, Daidai2,3 ; Yang, Fei 2; Liu, Lihua 2; Chen, Xuegang 1; Ye, Ying 1
	2019-07-01
发表期刊	ACTA OCEANOLOGICA SINICA
ISSN	0253-505X
卷号	38 期号:7 页码:84-95
通讯作者	Wu, Daidai(wudd@ms.giec.ac.cn)
摘要	Recent studies have shown that specific geochemical characteristics of sediments can be used to reconstruct past methane seepage events. In this work, the correlation between the Sr/Ca and Mg/Ca ratios of sediment samples is analyzed and the sulfate concentration profile in Site C14 from cold-seep sediments in the Qiongdongnan Basin in northern South China Sea is obtained. The results confirmed that, sulfate at 0-247 cm below sea floor (Unit I) is mainly consumed by organic matter sulfate reduction (OSR), while sulfate at 247-655 cm (Unit II) is consumed by both the OSR and the anaerobic oxidation of methane (AOM). In addition, the bottom sediment layer is affected by weak methane seepage. The Mo and U enrichment factors also exhibit similar trends in their respective depth profiles. The responses of trace elements, including Co/Al, Ni/Al, Cr/Al and Zn/Al ratios to methane seepage allowed the study of depositional conditions and methane seepage events. Based on the results, it is speculated that the depositional conditions of Unit II changed with depth from moderate conditions of sulfidic and oxic conditions to locally anoxic conditions, and finally to suboxic conditions due to methane fluid leakage. The stable isotope values of chromium-reducible sulfide produced by AOM and those of sulfide formed by OSR in the early diagenetic environment suffered serious depletion of S-34. This was probably due to weak methane leakage, which caused the slower upward diffusion and the effect of early diagenesis on the samples. It is necessary to consider the effects of depositional environments and diagenesis on these geochemical parameters.
关键词	Qiongdongnan Basin trace elements stable isotope values anaerobic oxidation of methane methane activity
DOI	10.1007/s13131-019-1460-6
关键词[WOS]	SOUTHWESTERN XISHA UPLIFT ; GAS HYDRATE ; PORE-WATER ; COLD SEEP ; AUTHIGENIC CARBONATES ; SHALLOW SEDIMENTS ; CONTINENTAL-SLOPE ; POCKMARK FIELD ; FLUID SOURCES ; MG/CA RATIOS
收录类别	SCI
语种	英语
资助项目	Program of Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences[ISEE2018YB03] ; Special Project for Marine Economy Development of Guangdong Province[GDME-2018D002] ; Evaluation and Detection Technology Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology[KC201703] ; Youth Innovation Promotion Association CAS[201432]
WOS研究方向	Oceanography
项目资助者	Program of Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences ; Special Project for Marine Economy Development of Guangdong Province ; Evaluation and Detection Technology Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology ; Youth Innovation Promotion Association CAS
WOS类目	Oceanography
WOS记录号	WOS:000476480800009
出版者	SPRINGER
引用统计	被引频次：4[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/344007/25457
专题	中国科学院广州能源研究所
通讯作者	Wu, Daidai
作者单位	1.Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Evaluat & Detect Technol Lab Marine Mineral Resou, Qingdao 266071, Shandong, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Sun, Tiantian,Wu, Daidai,Yang, Fei,et al. Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea[J]. ACTA OCEANOLOGICA SINICA,2019,38(7):84-95.
APA	Sun, Tiantian,Wu, Daidai,Yang, Fei,Liu, Lihua,Chen, Xuegang,&Ye, Ying.(2019).Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea.ACTA OCEANOLOGICA SINICA,38(7),84-95.
MLA	Sun, Tiantian,et al."Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea".ACTA OCEANOLOGICA SINICA 38.7(2019):84-95.