Magnetic Susceptibility in Surface Sediments in the Southern South China Sea and Its Implication for Sub-sea Methane Venting
Chen, Z ; Yan, W ; Tang, XZ ; Liu, JG ; Chen, MH ; Yang, HP
刊名JOURNAL OF EARTH SCIENCE
2009
卷号20期号:1页码:193-204
关键词magnetic susceptibility magnetic particle oil/gas & gas hydrate surface sediment southern South China Sea
ISSN号1674-487X
通讯作者chzhsouth@scsio.ac.cn
中文摘要In order to understand the characteristics of magnetic variability and their possible implication for sub-sea methane venting, magnetic susceptibility (MS) of 145 surface sediment samples from the southern South China Sea (SCS) was investigated. Magnetic particles extracted from 20 representative samples were also examined for their mineral, chemical compositions and micromorphology. Results indicate that MS values range between -7.73x10(-8) and 45.06x10(-8) m(3)/kg. The high MS zones occur at some hydrocarbon-bearing basins and along main tectonic zones, and low ones are distributed mainly within the river delta or along continental shelves. Iron concretions and manganese concretions are not main contributors for high MS values in sediments, while authigenic iron sulphide minerals are possibly responsible for the MS enhancement. This phenomenon is suspected to be produced by the reducing environment where the high upward venting methane beneath the seafloor reacts with seawater sulfate, resulting in seep precipitation of highly susceptible intermediate mineral pyrrhotite, greigite and paramagnetic pyrite. It suggests that MS variability is possibly one of the geochemical indicators for mapping sub-sea zones of methane venting in the southern SCS.
学科主题Geosciences, Multidisciplinary
收录类别SCI
原文出处CHINA UNIV GEOSCIENCES
WOS记录号WOS:000264753800019
公开日期2011-07-03
内容类型期刊论文
源URL[http://ir.scsio.ac.cn/handle/344004/4650]  
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
Chen, Z,Yan, W,Tang, XZ,et al. Magnetic Susceptibility in Surface Sediments in the Southern South China Sea and Its Implication for Sub-sea Methane Venting[J]. JOURNAL OF EARTH SCIENCE,2009,20(1):193-204.
APA Chen, Z,Yan, W,Tang, XZ,Liu, JG,Chen, MH,&Yang, HP.(2009).Magnetic Susceptibility in Surface Sediments in the Southern South China Sea and Its Implication for Sub-sea Methane Venting.JOURNAL OF EARTH SCIENCE,20(1),193-204.
MLA Chen, Z,et al."Magnetic Susceptibility in Surface Sediments in the Southern South China Sea and Its Implication for Sub-sea Methane Venting".JOURNAL OF EARTH SCIENCE 20.1(2009):193-204.
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