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Seismic structure of the northwestern margin of the South China Sea: implication for asymmetric continental extension
Huang, Haibo; Qiu, Xuelin4; Pichot, Thibaud1; Klingelhoefer, Frauke2; Zhao, Minghui4; Wang, Ping; Hao, Tianyao3,4
2019
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
Volume218Issue:2Pages:1246
AbstractEvolution of the continental margins of the South China Sea (SCS) is one of the open questions when discussing continental breakup and seafloor spreading. We processed data from a wide-angle seismic profile (OBS2011-1), which passes through the northwestern margin of the SCS, and performed travel time modelling to obtain the seismic velocity structures. The modelling results show a stepwise variation of the crustal thicknesses from continental margin to oceanic basin. Stretching factor of the upper crust is nearly double the estimate of the lower crust along the Zhongsha Trough. The lower crust shows asymmetrical upwelling towards the trough center, accompanied by similar to 0.3 kms(-1) of the velocity increase due to magmatic addition. The upper and lower crusts have almost the same stretching factor beneath continental blocks, indicating a uniform extension. Crustal structures of the conjugate margins of the Southwest Subbasin show similar velocity range and different thickness distribution, supporting the common origin and asymmetric extension of these two margins. The Ocean-Continent Transition zones (OCT) are much wider in the southern part (similar to 50 km) than the northern part (similar to 25 km) crossing the margins. We propose a tectonic model for the asymmetry of both the conjugate margins and the OCTs, favoring the highly stretched upper crust and accompanied by rising of the ductile middle-lower crust controlled by major low-angle faults. The rigid blocks may also act as a kind of hindrance for further evolution of the failed rifts and affect the shape of the OCT.
DepartmentOMG
KeywordSeismic tomography Continental tectonics: extensional Crustal structure Rheology: crust and lithosphere
DOI10.1093/gji/ggz219
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17942
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Beicip Franlab, 232 Ave Napoleon Bonaparte Rueil Malmaison, F-92500 Paris, France
3.IFREMER, Dept Marine Geosci, F-29280 Brest, France
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Huang, Haibo,Qiu, Xuelin,Pichot, Thibaud,et al. Seismic structure of the northwestern margin of the South China Sea: implication for asymmetric continental extension[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2019,218(2):1246, 1261.
APA Huang, Haibo.,Qiu, Xuelin.,Pichot, Thibaud.,Klingelhoefer, Frauke.,Zhao, Minghui.,...&Hao, Tianyao.(2019).Seismic structure of the northwestern margin of the South China Sea: implication for asymmetric continental extension.GEOPHYSICAL JOURNAL INTERNATIONAL,218(2),1246.
MLA Huang, Haibo,et al."Seismic structure of the northwestern margin of the South China Sea: implication for asymmetric continental extension".GEOPHYSICAL JOURNAL INTERNATIONAL 218.2(2019):1246.
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