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Decollements, Detachments, and Rafts in the Extended Crust of Dangerous Ground, South China Sea: The Role of Inherited Contacts
Liang, Yao1,2; Delescluse, Matthias1; Qiu, Yan3; Pubellier, Manuel1; Chamot-Rooke, Nicolas1; Wang, Jun3; Nie, Xie3; Watremez, Louise4; Chang, Sung-Ping1; Pichot, Thibaud1,5; Savva, Dimitri1,5; Meresse, Florian1
2019-06-01
Source PublicationTECTONICS
ISSN0278-7407
Volume38Issue:6Pages:1863-1883
AbstractWe 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.
KeywordSouth China Sea rifted margins detachments seismic imaging reactivation sediments
DOI10.1029/2018TC005418
Funding OrganizationNational 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
WOS KeywordCONTINENTAL BREAK-UP ; SEISMIC EVIDENCE ; NORTHWESTERN MARGIN ; TECTONIC EVOLUTION ; RIFTED MARGINS ; SUBBASIN ; PALAWAN ; TRANSITION ; EXTENSION ; BASIN
Language英语
Funding ProjectNational Natural Science Foundation of China[U1505232]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000475363100002
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92688
Collection中国科学院地质与地球物理研究所
Corresponding AuthorLiang, Yao; Delescluse, Matthias
Affiliation1.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
Recommended Citation
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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