Crustal plumbing system of post-rift magmatism in the northern margin of South China Sea: New insights from integrated seismology

doi:10.1016/j.tecto.2018.07.002

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

	Crustal plumbing system of post-rift magmatism in the northern margin of South China Sea: New insights from integrated seismology
	Xia, Shaohong ; Wan, Kuiyuan ; Cao, Jinghe ; Sun, Jinlong ; Mi, Lijun 2; Wu, Shiguo 3; Fan, Chaoyan ; Zhao, Dapeng 4; Zhao, Fang
刊名	TECTONOPHYSICS
	2018
卷号	744 页码:227
关键词	Post-rift magmatism South China Sea Rifting margins Sills High-velocity bodies
ISSN号	0040-1951
DOI	10.1016/j.tecto.2018.07.002
英文摘要	The origin and evolution of magmatism in lifting margins are a fundamental geological subject, and remain the focus of intense studies. Unlike the classical magma-poor and magma-rich rifting margins, the northern margin of the South China Sea (SCS) exhibits a strong post-rift magmatism, but the evolution and mechanism of this behavior are still poorly understood. In this work we investigate the detailed structural features of the post-rift magmatism in the crust of the SCS northern margin. Our analysis is based on wide-angle and multichannel reflection seismic data, combined with previous seismological results. Our results show a wide distribution of shallow igneous sills and intrusions. These features are spatially and tectonically linked to the lower crustal high velocity bodies (HVBs) and submarine volcanism, indicating a causative connection between the three features. Considering the existence of an obvious low-velocity branch of the Hainan plume in the northern SCS and uplift of the lithosphere-asthenosphere boundary, we propose that the HVBs reflect consolidated mafic intrusions which formed the lower crustal reservoirs feeding the overlying igneous sills and intrusions. In the SCS northern margin where abundant extensional and detachment faults can act as magmatic channels, such a dynamic process might cause post-rift volcanism. Our results suggest that the crustal magmatic system of post-rift volcanism has a multilevel upward migration mode, and the HVBs in the lower crust could be the product of post rift magmatism, further indicating that the SCS northern margin had a magma-poor property at the rifting phase but has undergone a strong magmatic rejuvenation by the subsequent mantle plume.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17680]
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.CNOOC Nanhai East Petr Bur, Shenzhen 518054, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China 3.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan 4.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Xia, Shaohong,Wan, Kuiyuan,Cao, Jinghe,et al. Crustal plumbing system of post-rift magmatism in the northern margin of South China Sea: New insights from integrated seismology[J]. TECTONOPHYSICS,2018,744:227, 238.
APA	Xia, Shaohong.,Wan, Kuiyuan.,Cao, Jinghe.,Sun, Jinlong.,Mi, Lijun.,...&Zhao, Fang.(2018).Crustal plumbing system of post-rift magmatism in the northern margin of South China Sea: New insights from integrated seismology.TECTONOPHYSICS,744,227.
MLA	Xia, Shaohong,et al."Crustal plumbing system of post-rift magmatism in the northern margin of South China Sea: New insights from integrated seismology".TECTONOPHYSICS 744(2018):227.