| 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 | |
| 发表期刊 | MARINE GEOPHYSICAL RESEARCH
 |
| 卷号 | 37期号:2页码:71-94 |
| 文章类型 | Article |
| 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. |
| 关键词 | Igneous Rock Seismic Imaging Passive Continental Margin South China Sea |
| DOI | 10.1007/s11001-016-9266-3 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000377921100001 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/130992 |
| 专题 | 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 |
| 第一作者单位 | 中国科学院海洋研究所 |
| 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. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Cenozoic magmatism i（44240KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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