Lateral crustal variation and post-rift magmatism in the northeastern South China Sea determined by wide-angle seismic data

doi:10.1016/j.margeo.2018.12.007

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Lateral crustal variation and post-rift magmatism in the northeastern South China Sea determined by wide-angle seismic data
	Zhao, Fang ; Sun, Jinlong ; Wan, Kuiyuan ; Xu, Huilong ; Fan, Chaoyan 1; Xia, Shaohong ; Cao, Jinghe
刊名	MARINE GEOLOGY
	2019
卷号	410 页码:70
关键词	Crustal structure Continental margin morphology Magmatic intrusion Wide-angle seismic data South China Sea
ISSN号	0025-3227
DOI	10.1016/j.margeo.2018.12.007
英文摘要	The 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.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17972]
专题	南海海洋研究所_中科院边缘海地质重点实验室
作者单位	1.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
推荐引用方式 GB/T 7714	Zhao, Fang,Sun, Jinlong,Wan, Kuiyuan,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	Zhao, Fang.,Sun, Jinlong.,Wan, Kuiyuan.,Xu, Huilong.,Fan, Chaoyan.,...&Cao, Jinghe.(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	Zhao, Fang,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.