IOCAS-IR  > 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, Qiao1,2,3; Wu, Shiguo1; Dong, Dongdong1
2016-06-01
Source PublicationMARINE GEOPHYSICAL RESEARCH
Volume37Issue:2Pages:71-94
SubtypeArticle
AbstractIgneous 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.
KeywordIgneous Rock Seismic Imaging Passive Continental Margin South China Sea
DOI10.1007/s11001-016-9266-3
Indexed BySCI
Language英语
WOS IDWOS:000377921100001
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/130992
Collection海洋地质与环境重点实验室
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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.
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