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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; wuxj@cnooc.com.cn
2009
发表期刊JOURNAL OF EARTH SCIENCE
ISSN1674-487X
卷号20期号:1页码:38-48
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.
部门归属[Wu Xiangjie; Pang Xiong; Shi Hesheng; He Min; Shen Jun; Zhang Xiangtao] Inst CNOOC Ltd, Guangzhou 510240, Guangdong, Peoples R China; [Hu Dengke] Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Hu Dengke] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
关键词Deep Structure Dynamics Passive Margin Geophysical Inversion Northern South China Sea
学科领域Geosciences, Multidisciplinary
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000264753800004
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被引频次:7[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/344004/4638
专题中科院边缘海地质重点实验室
通讯作者wuxj@cnooc.com.cn
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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.,...&wuxj@cnooc.com.cn.(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.
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