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Different expressions of the crustal structure across the Dongsha Rise along the northeastern margin of the South China Sea
Gao, Jinwei1,2; Peng, Xuechao3; Wu, Shiguo1,2; Luedmann, Thomas4; McIntosh, Kirk5; Ma, Benjun1; Xu, Ziying3
2019-03-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume171Issue:1Pages:187-200
Abstract

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.

KeywordCrustal Thinning Structural Contrast Ne South China Sea Multi-channel Seismic Profiles Gravity Modeling
DOI10.1016/j.jseaes.2018.01.034
Indexed BySCI
Funding OrganizationNational Marine Geological Program of China ; Natural Science Foundation of China ; Knowledge Innovation Frontier Sciences Program of the Chinese Academy of Sciences
Language英语
Funding ProjectNational 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 KeywordNorthern Continental-margin ; Baiyun-sag ; Heat-flow ; Northwestern Margin ; Qiongdongnan Basin ; Velocity Structure ; Conjugate Margins ; Ocean Transition ; Mantle Structure ; Magmatism
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000460709300016
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/5430
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorGao, Jinwei; Wu, Shiguo
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya 572000, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Minist Land & Resources, Guangzhou Marine Geol Survey, Key Lab Marine Mineral Resources, Guangzhou 510760, Guangdong, Peoples R China
4.Univ Hamburg, Ctr Earth Syst Res & Sustainabil, D-20146 Hamburg, Germany
5.Univ Texas Austin, Inst Geophys, R2200,10100 Burnet Rd, Austin, TX 78758 USA
Recommended Citation
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(1):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(1),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 171.1(2019):187-200.
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