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Crustal structure and extension mode in the northwestern margin of the South China Sea
Gao, Jinwei1; Wu, Shiguo1,2; McIntosh, Kirk3; Mi, Lijun4; Liu, Zheng5; Spence, George6; Wu Shiguo
2016-06-01
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume17Issue:6Pages:2143-2167
Abstract

Combining multi-channel seismic reflection and gravity modeling, this study has investigated the crustal structure of the northwestern South China Sea margin. These data constrain a hyper-extended crustal area bounded by basin-bounding faults corresponding to an aborted rift below the Xisha Trough with a subparallel fossil ridge in the adjacent Northwest Sub-basin. The thinnest crust is located in the Xisha Trough, where it is remnant lower crust with a thickness of less than 3 km. Gravity modeling also revealed a hyper-extended crust across the Xisha Trough. The postrift magmatism is well developed and more active in the Xisha Trough and farther southeast than on the northwestern continental margin of the South China Sea; and the magmatic intrusion/extrusion was relatively active during the rifting of Xisha Trough and the Northwest Sub-basin. A narrow continent-ocean transition zone with a width of approximate to 65 km bounded seaward by a volcanic buried seamount is characterized by crustal thinning, rift depression, low gravity anomaly and the termination of the break-up unconformity seismic reflection. The aborted rift near the continental margin means that there may be no obvious detachment fault like that in the Iberia-Newfoundland type margin. The symmetric rift, extreme hyper-extended continental crust and hotter mantle materials indicate that continental crust underwent stretching phase (pure-shear deformation), thinning phase and breakup followed by onset of seafloor spreading and the mantle-lithosphere may break up before crustal-necking in the northwestern South China Sea margin.

SubtypeArticle
KeywordSouth China Sea Xisha Trough Crustal Structure Rifting Process Multichannel Seismic Data Gravity Modeling
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/2016GC006247
Indexed BySCI
Language英语
WOS KeywordNORTHERN CONTINENTAL-MARGIN ; FLOOR SPREADING ANOMALIES ; OCEAN TRANSITION ZONE ; CONJUGATE MARGINS ; QIONGDONGNAN BASIN ; DEEP-STRUCTURE ; EASTERN GULF ; SEISMIC DATA ; LITHOSPHERIC EXTENSION ; TECTONIC IMPLICATIONS
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000380728300011
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/1599
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorWu, Shiguo
Affiliation1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Deep Sea Georesource, Sanya, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Univ Texas Austin R2200, Inst Geophys, Austin, TX USA
4.China Natl Offshore Oil Corp Ltd, Explorat Dept, Beijing, Peoples R China
5.China Natl Offshore Oil Corp Ltd, Zhanjiang Branch, Zhanjiang, Peoples R China
6.Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC, Canada
Recommended Citation
GB/T 7714
Gao, Jinwei,Wu, Shiguo,McIntosh, Kirk,et al. Crustal structure and extension mode in the northwestern margin of the South China Sea[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2016,17(6):2143-2167.
APA Gao, Jinwei.,Wu, Shiguo.,McIntosh, Kirk.,Mi, Lijun.,Liu, Zheng.,...&Wu Shiguo.(2016).Crustal structure and extension mode in the northwestern margin of the South China Sea.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,17(6),2143-2167.
MLA Gao, Jinwei,et al."Crustal structure and extension mode in the northwestern margin of the South China Sea".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 17.6(2016):2143-2167.
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