Methane source linked to gas hydrate system at hydrate drilling areas of the South China Sea: Porewater geochemistry and numerical model constraints

doi:10.1016/j.jseaes.2018.04.028

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	Methane source linked to gas hydrate system at hydrate drilling areas of the South China Sea: Porewater geochemistry and numerical model constraints
	Feng, Dong 1,4; Hu, Yu ; Luo, Min 2; Chen, Linying ; Liang, Qianyong 3; Tao, Jun 3; Yang, Shengxiong 3; Chen, Duofu 1
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2018
卷号	168 页码:87
关键词	Methane Anaerobic oxidation of methane Porewater Gas hydrate South China Sea
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2018.04.028
英文摘要	Methane of various origins is widespread in the sediments of continental margins, representing a key component of the carbon cycle in the ocean. Its occurrence in shallow marine sediments can be linked to the gas hydrate reservoir in the deep sedimentary column. However, this type of methane is difficult to track due to complex reactions occurred during its long distance migration. Porewater geochemical analyses of two similar to 7 m piston cores (D17-15 and W01-16) combined with a reaction-transport model were applied to quantify methane-related biogeochemical processes and to explore the linkage of shallow methane to gas hydrate reservoir in the hydrate drilling areas of Shenhu and Dongsha in the South China Sea (SCS). The model results revealed that anaerobic oxidation of methane (AOM) is the predominant biogeochemical process in both cores, consuming approximately 85% and 74% of sulfate in the modeled domain, respectively. The crossplot of dissolve inorganic carbon (DIC) accumulation versus sulfate depletion of the system suggests that methane consumed during the AOM is mainly originated from external methane sources rather than local methanogenesis. Using a delta C-13(DIC) mass balance calculation together with model-derived fractions of different DIC sources, we estimated that the delta C-13 value of the external methane in core D17-15 is -66.6%o, which is in accordance with the previous reported delta C-13 values of hydrate-bound methane in the area. These results suggest that methane consumed in shallow sediments in the hydrate drilling areas of the SCS is mainly originated from local gas hydrate reservoir. The proposed approach has the potential to be used to differentiate the sources of methane, which will provide constraints on dynamics of methane in gas hydrate-bearing marine sediments.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17665]
专题	南海海洋研究所_中科院边缘海地质重点实验室
作者单位	1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China 2.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 4.Guangzhou Marine Geol Survey, MLR Key Lab Marine Mineral Resources, Guangzhou 510075, Guangdong, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Feng, Dong,Hu, Yu,Luo, Min,et al. Methane source linked to gas hydrate system at hydrate drilling areas of the South China Sea: Porewater geochemistry and numerical model constraints[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:87, 95.
APA	Feng, Dong.,Hu, Yu.,Luo, Min.,Chen, Linying.,Liang, Qianyong.,...&Chen, Duofu.(2018).Methane source linked to gas hydrate system at hydrate drilling areas of the South China Sea: Porewater geochemistry and numerical model constraints.JOURNAL OF ASIAN EARTH SCIENCES,168,87.
MLA	Feng, Dong,et al."Methane source linked to gas hydrate system at hydrate drilling areas of the South China Sea: Porewater geochemistry and numerical model constraints".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):87.