SCSIO OpenIR  > 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; Zhao, Fang; Zhao, Dapeng1; Fan, Chaoyan; Wu, Shiguo2; Mi, Lijun3; Sun, Jinlong; Cao, Jinghe; Wan, Kuiyuan
2018
Source PublicationTECTONOPHYSICS
ISSN0040-1951
Volume744Pages:227
AbstractThe 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.
DepartmentMSG
KeywordPost-rift magmatism South China Sea Rifting margins Sills High-velocity bodies
DOI10.1016/j.tecto.2018.07.002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17680
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
4.CNOOC Nanhai East Petr Bur, Shenzhen 518054, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Xia, Shaohong,Zhao, Fang,Zhao, Dapeng,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.,Zhao, Fang.,Zhao, Dapeng.,Fan, Chaoyan.,Wu, Shiguo.,...&Wan, Kuiyuan.(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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.