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Lateral crustal variation and post-rift magmatism in the northeastern South China Sea determined by wide-angle seismic data
Fan, Chaoyan1; Xia, Shaohong; Cao, Jinghe; Zhao, Fang; Sun, Jinlong; Wan, Kuiyuan; Xu, Huilong
2019
Source PublicationMARINE GEOLOGY
ISSN0025-3227
Volume410Pages:70
AbstractThe northeastern margin of the South China Sea experienced continental rifting followed by magmatism in the Cenozoic. This evolution has strongly influenced the heterogeneity of its crustal structure. To gain insights into the spatial variation in crustal structure, data from 30 ocean bottom seismometers were used to forward model ten P-wave velocity models along both dip and strike directions. The Cenozoic strata (1.7-3.5 km/s), the Mesozoic strata (3.5-5.5 km/s), the crystalline crust (5.5-7.5 km/s) and high velocity lower crust (7.0-7.5 km/s) were identified based on P-wave velocities. Overall, the crust thins from similar to 25 km on the continental shelf to similar to 15 km on the slope, with thicker crust underneath the Dongsha Basin (a Mesozoic basin) but thinner crust underneath the pre-Cenozoic NW-trending fault zones. This difference in thickness is possibly controlled by different strength of inherited structures, i.e., the Dongsha Basin and the fault zones. Furthermore, a widespread high velocity lower crust layer, which resulted from the intrusion of a mafic sill complex, was observed over the shelf to slope. Mafic intrusions within the lower crust have uplifted the caprock on the shelf, and magma eruptions have formed many post-rift seamounts on the slope. The evidence suggests that post-rift magmatism overprinted the vertical crustal structure. We therefore propose that the heterogeneous crustal structures in this passive margin are an integrated result of segmental extension followed by magmatic overprinting.
DepartmentOMG
KeywordCrustal structure Continental margin morphology Magmatic intrusion Wide-angle seismic data South China Sea
DOI10.1016/j.margeo.2018.12.007
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17972
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.Univ Chinese Acad Sci, Beijing 101408, Peoples R China
Recommended Citation
GB/T 7714
Fan, Chaoyan,Xia, Shaohong,Cao, Jinghe,et al. Lateral crustal variation and post-rift magmatism in the northeastern South China Sea determined by wide-angle seismic data[J]. MARINE GEOLOGY,2019,410:70, 87.
APA Fan, Chaoyan.,Xia, Shaohong.,Cao, Jinghe.,Zhao, Fang.,Sun, Jinlong.,...&Xu, Huilong.(2019).Lateral crustal variation and post-rift magmatism in the northeastern South China Sea determined by wide-angle seismic data.MARINE GEOLOGY,410,70.
MLA Fan, Chaoyan,et al."Lateral crustal variation and post-rift magmatism in the northeastern South China Sea determined by wide-angle seismic data".MARINE GEOLOGY 410(2019):70.
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