Cenozoic magmatism in the northern continental margin of the South China Sea: evidence from seismic profiles

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Cenozoic magmatism in the northern continental margin of the South China Sea: evidence from seismic profiles
	Zhang, Qiao 1,2,3; Wu, Shiguo 1; Dong, Dongdong 1
刊名	MARINE GEOPHYSICAL RESEARCH
	2016-06-01
卷号	37 期号:2 页码:71-94
关键词	Igneous rock Seismic imaging Passive continental margin South China Sea
英文摘要	Igneous rocks in the northern margin of the South China Sea (SCS) have been identified via high resolution multi-channel seismic data in addition to other geophysical and drilling well data. This study identified intrusive and extrusive structures including seamounts and buried volcanoes, and their seismic characteristics. Intrusive features consist of piercement and implicit-piercement type structures, indicating different energy input associated with diapir formation. Extrusive structures are divided into flat-topped and conical-topped seamounts. Three main criteria (the overlying strata, the contact relationship and sills) were used to distinguish between intrusive rocks and buried volcanos. Three criteria are also used to estimate the timing of igneous rock formation: the contact relationship, the overlying sedimentary thickness and seismic reflection characteristics. These criteria are applied to recognize and distinguish between three periods of Cenozoic magmatism in the northern margin of the SCS: before seafloor spreading (Paleocene and Eocene), during seafloor spreading (Early Oligocene-Mid Miocene) and after cessation of seafloor spreading (Mid Miocene-Recent). Among them, greater attention is given to the extensive magmatism since 5.5 Ma, which is present throughout nearly all of the study area, making it a significant event in the SCS. Almost all of the Cenozoic igneous rocks were located below the 1500 m bathymetric contour. In contrast with the wide distribution of igneous rocks in the volcanic rifted margin, igneous rocks in the syn-rift stage of the northern margin of the SCS are extremely sporadic, and they could only be found in the southern Pearl River Mouth basin and NW sub-sea basin. The ocean-continent transition of the northern SCS exhibits high-angle listric faults, concentrated on the seaward side of the magmatic zone, and a sharply decreased crust, with little influence from a mantle plume. These observations provide further evidence to suggest that the northern margin of the SCS is a magma-poor rifted margin.
收录类别	SCI
语种	英语
WOS记录号	WOS:000377921100001
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/130992]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.State Ocean Adm, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qiao,Wu, Shiguo,Dong, Dongdong. Cenozoic magmatism in the northern continental margin of the South China Sea: evidence from seismic profiles[J]. MARINE GEOPHYSICAL RESEARCH,2016,37(2):71-94.
APA	Zhang, Qiao,Wu, Shiguo,&Dong, Dongdong.(2016).Cenozoic magmatism in the northern continental margin of the South China Sea: evidence from seismic profiles.MARINE GEOPHYSICAL RESEARCH,37(2),71-94.
MLA	Zhang, Qiao,et al."Cenozoic magmatism in the northern continental margin of the South China Sea: evidence from seismic profiles".MARINE GEOPHYSICAL RESEARCH 37.2(2016):71-94.