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学科主题: Multidisciplinary Sciences
题名: Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea
作者: Chen, Z ; Yan, W ; Chen, MH ; Wang, SH ; Lu, J ; Zhang, F ; Xiang, R ; Xiao, SB ; Yan, P ; Gu, SC
通讯作者: chzhsouth@scsio.ac.cn
关键词: seep carbonate nodule ; carbon and oxygen isotope ; methane seep ; gas hydrate ; northern South China Sea
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2006
卷: 51, 期:10, 页:1228-1237
收录类别: sci
部门归属: Chinese Acad Sci, S China Inst Oceanol, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510301, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510301, Peoples R China
项目归属: 海洋地质
摘要: Seep carbonate nodules were firstly collected from the southwestern Dongsha area on northern continental slope of South China Sea for mineralogical and geochemical studies. The results of X-ray diffraction show that carbonate nodules are composed of Fe-rich domolite, side rite and a few calcite and aragonite, as well as a small quantity of non-carbonate minerals such as goethite, quartz and clay minerals. Fe-rich dolomite and siderite characterized by euhedral microcrystalline structure were directly precipitated at cold seeps. The delta C-13 values for Fe-rich dolomite and siderite in the bulk nodules vary from -18.24 parts per thousand to -36.07 parts per thousand, and the delta O-18 values range from 0.42 to 2.76 parts per thousand.. Their moderate depleted 13 C reflects that carbon origin is possibly thermogenetic gas or mixed gas, which is evidence of gas ventings in the seafloor. Moreover, massive worm tube fossils related to cold seeps were found on the surfaces of carbonate nodules, and the conduits and/or channels in semi-solidified nodules which were not filled by carbonate or sediment were also observed. A preliminary conclusion is that active micro gas venting with a conduit/channel diameter range from 200 mu m to 600 mu m possibly exists in modern seafloor of the carbonate nodule area.
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WOS记录号: WOS:000238882200010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4410
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Chen, Z; Yan, W; Chen, MH; Wang, SH; Lu, J; Zhang, F; Xiang, R; Xiao, SB; Yan, P; Gu, SC.Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea,CHINESE SCIENCE BULLETIN,2006,51(10):1228-1237
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