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学科主题: Environmental Sciences & Ecology ; Geology ; Water Resources
题名: Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea
作者: Wang, SH ; Yan, W ; Magalhaes, VH ; Chen, Z ; Pinheiro, L ; Gussone, N
通讯作者: wyan@scsio.ac.cn
关键词: Methane-derived authigenic carbonate ; Cold seep ; Stable carbon and calcium isotope ; Northern South China Sea
刊名: ENVIRONMENTAL EARTH SCIENCES
发表日期: 2014
卷: 71, 期:5, 页:2087-2094
收录类别: sci
部门归属: [Wang, Shuhong ; Yan, Wen ; Chen, Zhong] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Wang, Shuhong ; Yan, Wen ; Chen, Zhong] Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China ; [Magalhaes, Vitor H. ; Pinheiro, Luis M.] Univ Aveiro, Ctr Environm & Marine Studies CESAM, P-3810193 Aveiro, Portugal ; [Magalhaes, Vitor H. ; Pinheiro, Luis M.] Univ Aveiro, Dept Geosci, P-3810193 Aveiro, Portugal ; [Gussone, Nikolaus] Univ Munster, Inst Mineral, D-48149 Munster, Germany
项目归属: 海洋地质
资助者: Knowledge Innovation Program of the Chinese Academy of Sciences [KZCX2-YW-GJ03-01]; National Natural Science Foundation of China [41276050, 41176052]; Scientific and Technology Program of Guangdong Province [2011A080403021]; National Basic Research Program of China(973) [2009CB219502-4]
摘要: This paper carried out mineral and geochemical studies on a profile through a diagenetic methane-derived authigenic carbonate sample that was collected from southwestern Dongsha area of the northern South China Sea. Five samples locating in the cross-sectional middle mainly consist of dolomite and quartz, and two samples close to the surface have a small amount of Mg-calcite. The delta C-13 values of the samples vary between -30.59 and -0.30 % VPDB, with delta O-18 values ranging from 3.07 to 3.59 % VPDB, delta Ca-44/40 values ranging from 1.35 to 1.47 % SRM915a, indicating a contribution of methane to the carbon pool where the precipitation of authigenic carbonates occurred. Based on the isotope values alone, it can not be distinguished if the carbon source is thermogenic gas or a mixture of biogenic methane and marine dissolved inorganic carbon. The delta O-18 values are in general consistent with dolomite precipitation from a fluid similar to present seawater. The observed small variation might be related to the oxygen isotope composition of seep fluid. The relative small range in calcium isotope values suggests that relatively constant growth conditions and precipitation from seawater. The central part of the carbonate nodule formed under the strong influence of methane seepage, and the external part is less influenced by methane, either due to reduced methane flux to the surface or caused by erosional exhumation of the carbonate nodule from greater depth to the sediment surface.
原文出处: 查看原文
WOS记录号: WOS:000330992400008
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10645
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wang, SH; Yan, W; Magalhaes, VH; Chen, Z; Pinheiro, L; Gussone, N.Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea,ENVIRONMENTAL EARTH SCIENCES,2014,71(5):2087-2094
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