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Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea
Chen, Z; Yan, W; Chen, MH; Wang, SH; Lu, J; Zhang, F; Xiang, R; Xiao, SB; Yan, P; Gu, SC; chzhsouth@scsio.ac.cn
2006
发表期刊CHINESE SCIENCE BULLETIN
ISSN1001-6538
卷号51期号:10页码:1228-1237
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.
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
关键词Seep Carbonate Nodule Carbon And Oxygen Isotope Methane Seep Gas Hydrate Northern South China Sea
学科领域Multidisciplinary Sciences
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000238882200010
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被引频次:33[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/344004/4410
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,Chen, MH,et al. Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea[J]. CHINESE SCIENCE BULLETIN,2006,51(10):1228-1237.
APA Chen, Z.,Yan, W.,Chen, MH.,Wang, SH.,Lu, J.,...&chzhsouth@scsio.ac.cn.(2006).Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea.CHINESE SCIENCE BULLETIN,51(10),1228-1237.
MLA Chen, Z,et al."Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea".CHINESE SCIENCE BULLETIN 51.10(2006):1228-1237.
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