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学科主题: Geosciences, Multidisciplinary
题名: Crust and upper mantle structure and its tectonic implications in the South China Sea and adjacent regions
作者: [Tang, Qunshu] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Zheng, Chan] S China Agr Univ, Coll Informat, Guangzhou 510642, Guangdong, Peoples R China
通讯作者: tqsh@scsio.ac.cn
关键词: South China Sea ; Rayleigh waves tomography ; Shear wave velocity ; Lithosphere
刊名: JOURNAL OF ASIAN EARTH SCIENCES
发表日期: 2013
卷: 62, 页:510-525
部门归属: 海洋地质
资助者: The IRIS (www.iris.edu) and NDSN (www.csndmc.ac.cn) seismic data management centers are highly appreciated. Two anonymous reviewers are greatly acknowledged for their constructive comments. We thank E. Debayle and M. Sambridge for their tomographic code (Debayle and Sambridge, 2004) and Professor Robert Herrmann for his software package of Computer Programs in Seismology (CPS; Herrmann and Ammon, 2002). Generic Mapping Tools (GMT; Wessel and Smith, 1998) is used for preparing all the figures. This research is supported financially by the National Natural Science Foundation of China (Grants 40904011, 41176026, and 40806022) and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant SQ200908).
摘要: We present a 3D S-velocity model for the crust and upper mantle of the South China Sea and the surrounding regions, constrained from the analysis of over 12,000 of fundamental Rayleigh wave dispersion curves between 10 s and 150 s periods. The lateral resolution was found to vary from degrees 2 to degrees 4 with the increasing period over the study region. A robust scheme of Debayle and Sambridge allowed us to conduct the tomographic inversion efficiently for massive datasets. Group velocity maps varying with period show lateral heterogeneities, well related to the geological and tectonic features in the study region. The 3D S-velocity model was constructed from the 1D structure inversion of the tomographic group velocity dispersion curves at each node. The obtained average crustal structure is similar to the PREM model, while the average mantle velocity is typically lower than the global average. The complicated 3D structures reveal three prominent features correlated with geological divisions: sea basin regions, island and arc regions, and continental regions. The derived crustal and lithospheric thicknesses range from similar to 15 to >50 km and from similar to 60 to >140 km, respectively, with the thinnest in the South China Sea, the thickest in eastern Tibet and the Yangtze Block, and the medium in the South China Fold Belt, Indochina, and island arc regions. Our results further confirm that (1) a Mesozoic subduction zone, which is interpreted as the tectonic weak zone during the Paleogene, exists along the South China margin; (2) the influence of the Indochina extrusion along the Red River Fault is limited for the South China Sea region; (3) there is a slab remnant of the proto-South China Sea beneath Borneo. New findings suggest that the Mesozoic subduction zone should be built into any evolution model for the region, as well as the other two major tectonic boundaries of the Red River Fault and proto-South China Sea subduction zone. (c) 2012 Elsevier Ltd. All rights reserved.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000315076500038
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11140
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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[Tang, Qunshu] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Zheng, Chan] S China Agr Univ, Coll Informat, Guangzhou 510642, Guangdong, Peoples R China.Crust and upper mantle structure and its tectonic implications in the South China Sea and adjacent regions,JOURNAL OF ASIAN EARTH SCIENCES,2013,62():510-525
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