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Decollements, Detachments, and Rafts in the Extended Crust of Dangerous Ground, South China Sea: The Role of Inherited Contacts

文献类型：期刊论文

作者Liang, Yao1,2; Delescluse, Matthias1; Qiu, Yan3; Pubellier, Manuel1; Chamot-Rooke, Nicolas1; Wang, Jun3; Nie, Xie3; Watremez, Louise4; Chang, Sung-Ping1; Pichot, Thibaud1,5
刊名TECTONICS
出版日期2019-06-01
卷号38期号:6页码:1863-1883
关键词South China Sea rifted margins detachments seismic imaging reactivation sediments
ISSN号0278-7407
DOI10.1029/2018TC005418
英文摘要We investigate the crustal structure of the Dangerous Ground (South China Sea) through processing and interpretation of coincident wide-angle reflection and refraction seismic data. Continental crust of Dangerous Ground has been moderately thinned, down to 15 km, so that most of the structures accompanying the early opening of the South China Sea from Cretaceous to Miocene have been preserved. Subbasement reflectors as well as refraction velocities image an interpreted dismantled Mesozoic metamorphic unit in the southernmost section of our study area. A rollover structure indicates that the reflective base of the unit was used as a decollement where low-angle normal faults root and blocks rafted. The metamorphic unit is discontinued in a nearby basin located immediately to the north, where the refraction velocity model shows thinning of the crust from 20 to 15 km, with the presence of a 5-km-high mantle dome. In this deeper basin, mass transport deposits are found lying on a strong amplitude basement reflector interpreted as the footwall of an similar to 15 km offset crustal detachment surface that we link down to the mantle dome. We infer that the detachment reactivated an inherited low-angle contact most probably related to the Yanshanian belt. In map view, the reactivated structure forms a half-graben basin oriented NNE-SSW oblique to the generally accepted direction of extension. This orientation follows the general trend of a granitic belt that spanned the South China margin prior to extension, related to the subduction of the Paleo-Pacific.
WOS关键词CONTINENTAL BREAK-UP ; SEISMIC EVIDENCE ; NORTHWESTERN MARGIN ; TECTONIC EVOLUTION ; RIFTED MARGINS ; SUBBASIN ; PALAWAN ; TRANSITION ; EXTENSION ; BASIN
资助项目National Natural Science Foundation of China[U1505232]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000475363100002
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/92688]  
专题中国科学院地质与地球物理研究所
通讯作者Liang, Yao; Delescluse, Matthias
作者单位1.PSL Res Univ, Ecole Normale Super, CNRS, Lab Geol,UMR 8538, Paris, France
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Guangzhou Marine Geol Survey, Guangzhou, Guangdong, Peoples R China
4.Univ Littoral Cote dOpale, Univ Lille, CNRS, UMR 8187,Lab Oceanol & Geosci, Lille, France
5.Beicip Franlab, Rueil Malmaison, France
推荐引用方式
GB/T 7714		 Liang, Yao,Delescluse, Matthias,Qiu, Yan,et al. Decollements, Detachments, and Rafts in the Extended Crust of Dangerous Ground, South China Sea: The Role of Inherited Contacts[J]. TECTONICS,2019,38(6):1863-1883.
APA Liang, Yao.,Delescluse, Matthias.,Qiu, Yan.,Pubellier, Manuel.,Chamot-Rooke, Nicolas.,...&Meresse, Florian.(2019).Decollements, Detachments, and Rafts in the Extended Crust of Dangerous Ground, South China Sea: The Role of Inherited Contacts.TECTONICS,38(6),1863-1883.
MLA Liang, Yao,et al."Decollements, Detachments, and Rafts in the Extended Crust of Dangerous Ground, South China Sea: The Role of Inherited Contacts".TECTONICS 38.6(2019):1863-1883.

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来源：地质与地球物理研究所

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