Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea

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	Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea
	Wang, SH ; Yan, W ; Magalhaes, VH ; Chen, Z ; Pinheiro, L ; Gussone, N
刊名	ENVIRONMENTAL EARTH SCIENCES
	2014
卷号	71 期号:5 页码:2087-2094
关键词	Methane-derived authigenic carbonate Cold seep Stable carbon and calcium isotope Northern South China Sea
ISSN号	1866-6280
通讯作者	wyan@scsio.ac.cn
中文摘要	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.
学科主题	Environmental Sciences & Ecology ; Geology ; Water Resources
收录类别	SCI
资助信息	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]
原文出处	SPRINGER
WOS记录号	WOS:000330992400008
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10645]
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	Wang, SH,Yan, W,Magalhaes, VH,et al. Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea[J]. ENVIRONMENTAL EARTH SCIENCES,2014,71(5):2087-2094.
APA	Wang, SH,Yan, W,Magalhaes, VH,Chen, Z,Pinheiro, L,&Gussone, N.(2014).Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea.ENVIRONMENTAL EARTH SCIENCES,71(5),2087-2094.
MLA	Wang, SH,et al."Factors influencing methane-derived authigenic carbonate formation at cold seep from southwestern Dongsha area in the northern South China Sea".ENVIRONMENTAL EARTH SCIENCES 71.5(2014):2087-2094.