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

doi:10.1016/j.marpetgeo.2020.104397

IOCAS-IR > 海洋地质与环境重点实验室

	Symmetry of the South China Sea conjugate margins in a rifting, drifting and collision context
	Bai, Yongliang 1; Wang, Xiaoyu 1; Dong, Dongdong 2; Brune, Sascha 3,4; Wu, Shiguo 5; Wang, Zhenjie 1
	2020-07-01
发表期刊	MARINE AND PETROLEUM GEOLOGY
ISSN	0264-8172
卷号	117 页码:13
通讯作者	Bai, Yongliang(yongliang.bai1986@gmail.com)
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.
关键词	South China Sea conjugate margins Symmetry and asymmetry Rifting and drifting processes Total extension Crustal stretching style
DOI	10.1016/j.marpetgeo.2020.104397
收录类别	SCI
语种	英语
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
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000537575300039
出版者	ELSEVIER SCI LTD
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/167646
专题	海洋地质与环境重点实验室
通讯作者	Bai, Yongliang
作者单位	1.China Univ Petr, Coll Oceanog & Space Informat, Qingdao 266580, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.GFZ German Res Ctr Geosci, Geodynam Modelling Sect, Potsdam, Germany 4.Univ Potsdam, Inst Geosci, Potsdam, Germany 5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, 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.

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