Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	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
刊名	CHINESE SCIENCE BULLETIN
	2006
卷号	51 期号:10 页码:1228-1237
关键词	seep carbonate nodule carbon and oxygen isotope methane seep gas hydrate northern South China Sea
ISSN号	1001-6538
通讯作者	chzhsouth@scsio.ac.cn
中文摘要	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.
学科主题	Multidisciplinary Sciences
收录类别	SCI
原文出处	SCIENCE CHINA PRESS
WOS记录号	WOS:000238882200010
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4410]
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	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.,...&Gu, SC.(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.