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学科主题: Geochemistry & Geophysics; Oceanography
题名: Crustal thinning of the northern continental margin of the South China Sea
作者: Tsai, CH ; Hsu, SK ; Yeh, YC ; Lee, CS ; Xia, KY
通讯作者: chtsai@oc.gep.ncu.edu.tw
关键词: continental margin ; crustal structure ; crustal thinning ; gravity modeling ; South China sea
刊名: MARINE GEOPHYSICAL RESEARCHES
发表日期: 2004
卷: 25, 期:40545, 页:63-78
收录类别: sci
部门归属: Natl Cent Univ, Inst Geophys, Chungli 32054, Taiwan; Natl Taiwan Ocean Univ, Inst Appl Geosci, Chilung, Taiwan; Chinese Acad Sci, S China Sea Inst Oceanol, Beijing 100864, Peoples R China
项目归属: LED
摘要: Magnetic data suggest that the distribution of the oceanic crust in the northern South China Sea (SCS) may extend to about 21 degrees N and 118.5 degrees E. To examine the crustal features of the corresponding continent-ocean transition zone, we have studied the crustal structures of the northern continental margin of the SCS. We have also performed gravity modeling by using a simple four-layer crustal model to understand the geometry of the Moho surface and the crustal thicknesses beneath this transition zone. In general, we can distinguish the crustal structures of the study area into the continental crust, the thinned continental crust, and the oceanic crust. However, some volcanic intrusions or extrusions exist. Our results indicate the existence of oceanic crust in the northernmost SCS as observed by magnetic data. Accordingly, we have moved the continent-ocean boundary (COB) in the northeastern SCS from about 19 degrees N and 119.5 degrees E to 21 degrees N and 118.5 degrees E. Morphologically, the new COB is located along the base of the continental slope. The southeastward thinning of the continental crust in the study area is prominent. The average value of crustal thinning factor of the thinned continental crust zone is about 1.3-1.5. In the study region, the Moho depths generally vary from ca. 28 km to ca. 12 km and the crustal thicknesses vary from ca. 24 km to ca. 6 km; a regional maximum exists around the Dongsha Island. Our gravity modeling has shown that the oceanic crust in the northern SCS is slightly thicker than normal oceanic crust. This situation could be ascribed to the post-spreading volcanism or underplating in this region.
原文出处: 查看原文
WOS记录号: WOS:000231942300005
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5585
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Tsai, CH; Hsu, SK; Yeh, YC; Lee, CS; Xia, KY.Crustal thinning of the northern continental margin of the South China Sea,MARINE GEOPHYSICAL RESEARCHES,2004,25(40545):63-78
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