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学科主题: Geosciences, Multidisciplinary
题名: Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern South China Sea
作者: Wu, XJ ; Pang, X ; Shi, HS ; He, M ; Shen, J ; Zhang, XT ; Hu, DK
通讯作者: wuxj@cnooc.com.cn
关键词: deep structure ; dynamics ; passive margin ; geophysical inversion ; northern South China Sea
刊名: JOURNAL OF EARTH SCIENCE
发表日期: 2009
卷: 20, 期:1, 页:38-48
收录类别: sci
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
项目归属: 海洋地质
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.
原文出处: 查看原文
WOS记录号: WOS:000264753800004
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4638
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wu, XJ; Pang, X; Shi, HS; He, M; Shen, J; Zhang, XT; Hu, DK.Deep Structure and Dynamics of Passive Continental Margin from Shelf to Ocean of the Northern South China Sea,JOURNAL OF EARTH SCIENCE,2009,20(1):38-48
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