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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; chzhsouth@scsio.ac.cn
2009
发表期刊JOURNAL OF EARTH SCIENCE
ISSN1674-487X
卷号20期号:1页码:193-204
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.
部门归属[Chen Zhong; Yan Wen; Tang Xianzan; Liu Jianguo; Chen Muhong] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Yang Huaping] Zhuhai Campus Beijing Inst Technol, Coll Chem Engn & Mat Sci, Zhuhai 519085, Peoples R China
关键词Magnetic Susceptibility Magnetic Particle Oil/Gas & Gas Hydrate Surface Sediment Southern South China Sea
学科领域Geosciences, Multidisciplinary
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000264753800019
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4650
专题中科院边缘海地质重点实验室
通讯作者chzhsouth@scsio.ac.cn
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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.,...&chzhsouth@scsio.ac.cn.(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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