Spatial variation in depth of sulfate-methane interface in sediments of the northern slope of the South China Sea and its implication for occurring status of methane hydrate

MENG Xianwei; ZHANG Jun; XIA Peng; WANG Xiangqin

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MENG Xianwei, ZHANG Jun, XIA Peng, WANG Xiangqin. Spatial variation in depth of sulfate-methane interface in sediments of the northern slope of the South China Sea and its implication for occurring status of methane hydrate[J]. Haiyang Xuebao, 2013, 35(6): 190-194.

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Spatial variation in depth of sulfate-methane interface in sediments of the northern slope of the South China Sea and its implication for occurring status of methane hydrate

First Institute of Oceanography, State Oceanic Adminstration, Qingddao 266061, China

Received Date: 2012-08-22

Abstract

Abstract

The depth of sulfate-metnane interface (SMI) in sediments could indicate occurring status of methane hydrate. By systimatically paralell analysis of pore water geochemical data and authgenic cabonate oxygen and carbon isotopic data available from the potential gas hydrate areas of the northern slope of the South China Sea (SCS),the implication of spatial variation of sulfate-metnane interface in sediments for occurring status of underlying methane hydrate in the northern slope of SCS was discussed. It was illustrated that the SMI in sediments of the northern slope of SCS tends to be shallow from the southwest to the northeast. The spatial variation of SMI exactly corresponds to accretion of released methane which was indicated by carbon isotope of the authigenic carbonate,implicating that the buried depth of underlying methane hydrate temds to be shallow,or decomposition of underlying methane hydrate temds to be intensive from the southwest to the northeast.
- northern slope of the South China Sea,
- sulfate-methane interface,
- released methane flux,
- occurring status of underlying methane hydrate

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