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Different expressions of the crustal structure across the Dongsha Rise along the northeastern margin of the South China Sea

文献类型：期刊论文

作者Gao, Jinwei2,3; Peng, Xuechao5; Wu, Shiguo2,3; Luedmann, Thomas1; McIntosh, Kirk4; Ma, Benjun2; Xu, Ziying5
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2019-03-01
卷号171页码:187-200
关键词Crustal thinning Structural contrast NE South China Sea Multi-channel seismic profiles Gravity modeling
ISSN号1367-9120
DOI10.1016/j.jseaes.2018.01.034
英文摘要This study presents two long-cable, deep-penetration, multi-channel seismic reflection images and associated gravity modeling to delineate structures and magmatic features that occur along the margins of the eastern and western Dongsha Rise in the northeast South China Sea (SCS). These data show approximately symmetrical sags imaged on the shelf, but the structures begin to vary in multiple ways along the eastern and western Dongsha Rise after crossing the continental shelf. At the slope break, an anticline with two thrust faults and a Mesozoic unconformity are imaged on the eastern Dongsha Rise, whereas negative flower structures are detected on the western Dongsha Rise. Most large-scale normal faults sole into a mid- or lower-crustal detachment below the lower slope on the eastern Dongsha Rise whereas some uplifts with small fault offsets were imaged at the lower slope and seaward-dipping tilted fault blocks were imaged between the lower slope and oceanic basin on the western Dongsha Rise. Magmatism, expressed by different types, such as intrusions, volcanoes and sills, was active since at least 5.5 Ma; and magmatic deposits appear to be well-developed on the eastern Dongsha Rise of the northeastern SCS margin. Gravity modeling showed that the crust below the lower slope/oceanic basin in the eastern Dongsha Rise is hyper-extended continental crust underplated by a high velocity layer with a maximum thickness of 9.4 km below the slope break, rather than thickened oceanic crust. The continent-ocean transition zone (COT) has a broader extent on the eastern Dongsha Rise compared to the western Dongsha Rise. Pure-shear deformation and lower crustal flow have led to the formation of the crustal structural contrasts and the wide northeastern continental margin of the SCS.
WOS关键词NORTHERN CONTINENTAL-MARGIN ; BAIYUN-SAG ; HEAT-FLOW ; NORTHWESTERN MARGIN ; QIONGDONGNAN BASIN ; VELOCITY STRUCTURE ; CONJUGATE MARGINS ; OCEAN TRANSITION ; MANTLE STRUCTURE ; MAGMATISM
资助项目National Marine Geological Program of China[1212011220115] ; Natural Science Foundation of China[41706051] ; Knowledge Innovation Frontier Sciences Program of the Chinese Academy of Sciences[SIDSSE-201403]
WOS研究方向Geology
语种英语
WOS记录号WOS:000460709300016
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Marine Geological Program of China ; Natural Science Foundation of China ; Knowledge Innovation Frontier Sciences Program of the Chinese Academy of Sciences
源URL[http://ir.idsse.ac.cn/handle/183446/5430]  
专题深海科学研究部_深海地球物理与资源研究室
通讯作者Gao, Jinwei; Wu, Shiguo
作者单位1.Univ Hamburg, Ctr Earth Syst Res & Sustainabil, D-20146 Hamburg, Germany
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya 572000, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
4.Univ Texas Austin, Inst Geophys, R2200,10100 Burnet Rd, Austin, TX 78758 USA
5.Minist Land & Resources, Guangzhou Marine Geol Survey, Key Lab Marine Mineral Resources, Guangzhou 510760, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Gao, Jinwei,Peng, Xuechao,Wu, Shiguo,et al. Different expressions of the crustal structure across the Dongsha Rise along the northeastern margin of the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,171:187-200.
APA Gao, Jinwei.,Peng, Xuechao.,Wu, Shiguo.,Luedmann, Thomas.,McIntosh, Kirk.,...&Xu, Ziying.(2019).Different expressions of the crustal structure across the Dongsha Rise along the northeastern margin of the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,171,187-200.
MLA Gao, Jinwei,et al."Different expressions of the crustal structure across the Dongsha Rise along the northeastern margin of the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 171(2019):187-200.

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来源：深海科学与工程研究所

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