Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern 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

	Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern South China Sea
	Wu, XJ ; Pang, X ; Shi, HS ; He, M ; Shen, J ; Zhang, XT ; Hu, DK
刊名	JOURNAL OF EARTH SCIENCE
	2009
卷号	20 期号:1 页码:38-48
关键词	deep structure dynamics passive margin geophysical inversion northern South China Sea
ISSN号	1674-487X
通讯作者	wuxj@cnooc.com.cn
中文摘要	To study the deep dynamic mechanism leading to the difference in rifting pattern and basin structure from shelf to oceanic basin in passive continental margin, we constructed long geological sections across the shelf, slope and oceanic basin using new seismic data. Integrated gravity-magnetic inversion and interpretation of these sections were made with the advanced dissection method. Results show that the basement composition changes from intermediate-acid intrusive rocks in the shelf to intermediate-basic rocks in the slope. The Moho surface shoals gradually from 31 km in the shelf to 22.5 km in the uplift and then 19 kin in the slope and finally to 13 km in the oceanic basin. The crust thickness also decreases gradually from 30 km in the northern fault belt to 9 km in the oceanic basin. The crustal stretching factor increases from the shelf toward the oceanic basin, with the strongest extension under the sags and the oceanic basin. The intensity of mantle upwelling controlled the style of basin structures from shelf to oceanic basin. In the Zhu 1 depression on the shelf, the crust is nearly normal, the brittle and cold upper crust mainly controlled the fault development; so the combinative grabens with single symmetric graben are characteristic. In the slope, the crust thinned with a large stretching factor, affected by the mantle upwelling. The ductile deformation controlled the faults, so there developed an asymmetric complex graben in the Baiyun (sic) sag.
学科主题	Geosciences, Multidisciplinary
收录类别	SCI
原文出处	CHINA UNIV GEOSCIENCES
WOS记录号	WOS:000264753800004
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4638]
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	Wu, XJ,Pang, X,Shi, HS,et al. Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern South China Sea[J]. JOURNAL OF EARTH SCIENCE,2009,20(1):38-48.
APA	Wu, XJ.,Pang, X.,Shi, HS.,He, M.,Shen, J.,...&Hu, DK.(2009).Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern South China Sea.JOURNAL OF EARTH SCIENCE,20(1),38-48.
MLA	Wu, XJ,et al."Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern South China Sea".JOURNAL OF EARTH SCIENCE 20.1(2009):38-48.