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Symmetry of the South China Sea conjugate margins in a rifting, drifting and collision context

文献类型：期刊论文

作者Bai, Yongliang5; Wang, Xiaoyu5; Dong, Dongdong4; Brune, Sascha2,3; Wu, Shiguo1; Wang, Zhenjie5
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2020-07-01
卷号117页码:13
关键词South China Sea conjugate margins Symmetry and asymmetry Rifting and drifting processes Total extension Crustal stretching style
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2020.104397
英文摘要The symmetry of conjugate rifted margins is a first-order observable feature reflecting the geodynamic processes acing during and after continental rifting. The symmetry of the South China Sea (SCS) rifted margins can be deduced from comprehensive geophysical datasets on a continental-margin scale. Here, we combine three key approaches: (1) lateral fault distributions are delineated according to free-air gravity anomalies, (2) crustal stretching styles are mapped based on gravity inversion constrained by deep seismic profiles, and (3) total extension of conjugate margins is estimated according to margin restorations and tectonic settings. We infer a predominantly symmetric rifting style caused by pure shear extension, with only narrow domains of asymmetric deformation in continent-ocean transition (COT) regions that have undergone simple shear and where the lower crust of the highly thinned distal margin is embrittled before continental breakup. However, our analysis also suggests that this symmetry has been modified by post-rift geodynamic processes. Southward lower crustal flow, which occurred only on the southern margin due to the low viscosity of the lower crust and the slab pull induced by the subducting Proto-SCS plate during seafloor spreading, shifted the crustal stretching styles from symmetric to asymmetric. The collision between the southern margin and Borneo thickened the lower crust more than the upper crust at the southern end of the southern margin and shortened the southern margin. This event had a large impact on the SE margin but a small impact on the SW margin. We conclude that (1) for the SE and NE margins, the crustal stretching styles shifted from asymmetric to approximately symmetric, and the total extension shifted from symmetric to asymmetric; (2) for the SW and NW margins, the crustal stretching and total extension remained asymmetric and symmetric, respectively.
WOS关键词CONTINENTAL BREAK-UP ; NONVOLCANIC RIFTED MARGINS ; CRUSTAL STRUCTURE ; TECTONIC EVOLUTION ; GRAVITY INVERSION ; PASSIVE MARGIN ; XISHA TROUGH ; EXTENSION ; BASIN ; DEPTH
资助项目National Natural Science Foundation of China[41506055] ; National Natural Science Foundation of China[41476042] ; National Natural Science Foundation of China[41976051] ; National Natural Science Foundation of China[U170120019] ; National Key Research and Development Program of China[2019YFC1509204] ; National Key Research and Development Program of China[2018YFC0603300] ; Open Fund of State Key Laboratory of Earthquake Dynamics[LED2019B01] ; Helmholtz Association for the Young Investigators Group CRYSTALS[VH-NG-1132]
WOS研究方向Geology
语种英语
WOS记录号WOS:000537575300039
出版者ELSEVIER SCI LTD
资助机构National Natural Science Foundation of China ; National Key Research and Development Program of China ; Open Fund of State Key Laboratory of Earthquake Dynamics ; Helmholtz Association for the Young Investigators Group CRYSTALS
源URL[http://ir.idsse.ac.cn/handle/183446/7707]  
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Bai, Yongliang
作者单位1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
2.Univ Potsdam, Inst Geosci, Potsdam, Germany
3.GFZ German Res Ctr Geosci, Geodynam Modelling Sect, Potsdam, Germany
4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
5.China Univ Petr, Coll Oceanog & Space Informat, Qingdao 266580, Peoples R China
推荐引用方式
GB/T 7714		 Bai, Yongliang,Wang, Xiaoyu,Dong, Dongdong,et al. Symmetry of the South China Sea conjugate margins in a rifting, drifting and collision context[J]. MARINE AND PETROLEUM GEOLOGY,2020,117:13.
APA Bai, Yongliang,Wang, Xiaoyu,Dong, Dongdong,Brune, Sascha,Wu, Shiguo,&Wang, Zhenjie.(2020).Symmetry of the South China Sea conjugate margins in a rifting, drifting and collision context.MARINE AND PETROLEUM GEOLOGY,117,13.
MLA Bai, Yongliang,et al."Symmetry of the South China Sea conjugate margins in a rifting, drifting and collision context".MARINE AND PETROLEUM GEOLOGY 117(2020):13.

入库方式： OAI收割

来源：深海科学与工程研究所

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