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Crustal and upper mantle velocity structure in Yunnan, Southwest China

文献类型：期刊论文

作者Zhang, Xi2; Wang, Yanghua1
刊名TECTONOPHYSICS
出版日期2009-06-15
卷号471期号:3-4页码:171-185
关键词Wide-angle seismic reflections P-wave velocity model Geodynamic implications Yunnan Southwest China
ISSN号0040-1951
DOI10.1016/j.tecto.2009.02.009
文献子类Article
英文摘要Four wide-angle seismic profiles acquired in analogue form in the 1980s from Yunnan, Southwest China, are redigitized and re-interpreted for a detailed P-wave velocity structure of the crust and lithospheric mantle. The results reveal that the crust can be divided roughly into upper, middle and lower crusts with bottom depths of 17-25,26-33, and 33-56 km, respectively. The Moho depth varies from 56 km in the north of Yunnan to about 33 km in the southern part, and from 38-40 km in the west of Yunnan to 42 km in the eastern zone. The velocity anisotropy in the lower crust is of 4.4%, in contrast with the very low values estimated for the upper-middle crust, which are close to 1.6%. This suggests that the surface deformation in the Yunnan area is decoupled from the lower crustal flow. The seismic velocity discrepancy along different azimuths in the lower crust and upper mantle beneath the profiling cross points leads to a flow regime in the north-south direction that agrees with contemporary tectonic deformation, and also provides evidence for the rotation of the lower crust-upper mantle medium around the east Himalayan foreland. High-velocity anomalies in the lower crust might be explained as intrusions of mantle material or remaining patches of ancient oceanic crust. (C) 2009 Elsevier B.V. All rights reserved.
WOS关键词FINITE-DIFFERENCE CALCULATION ; WESTERN YUNNAN ; WAVE VELOCITIES ; RED RIVER ; PROVINCE ; TOMOGRAPHY ; BELT ; LITHOSPHERE ; ANISOTROPY ; PROFILES
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000267690400001
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(KZCX2-109) ; Chinese Academy of Sciences(KZCX2-109) ; Science and Technology Ministry of China(2002CB412604) ; Science and Technology Ministry of China(2002CB412604) ; Natural Science Foundation of China(40304006) ; Natural Science Foundation of China(40304006) ; Chinese Academy of Sciences(KZCX2-109) ; Chinese Academy of Sciences(KZCX2-109) ; Science and Technology Ministry of China(2002CB412604) ; Science and Technology Ministry of China(2002CB412604) ; Natural Science Foundation of China(40304006) ; Natural Science Foundation of China(40304006) ; Chinese Academy of Sciences(KZCX2-109) ; Chinese Academy of Sciences(KZCX2-109) ; Science and Technology Ministry of China(2002CB412604) ; Science and Technology Ministry of China(2002CB412604) ; Natural Science Foundation of China(40304006) ; Natural Science Foundation of China(40304006) ; Chinese Academy of Sciences(KZCX2-109) ; Chinese Academy of Sciences(KZCX2-109) ; Science and Technology Ministry of China(2002CB412604) ; Science and Technology Ministry of China(2002CB412604) ; Natural Science Foundation of China(40304006) ; Natural Science Foundation of China(40304006)
源URL[http://ir.iggcas.ac.cn/handle/132A11/71422]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Yanghua
作者单位1.Univ London Imperial Coll Sci Technol & Med, Ctr Reservoir Geophys, Dept Earth Sci & Engn, London SW7 2BP, England
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Xi,Wang, Yanghua. Crustal and upper mantle velocity structure in Yunnan, Southwest China[J]. TECTONOPHYSICS,2009,471(3-4):171-185.
APA Zhang, Xi,&Wang, Yanghua.(2009).Crustal and upper mantle velocity structure in Yunnan, Southwest China.TECTONOPHYSICS,471(3-4),171-185.
MLA Zhang, Xi,et al."Crustal and upper mantle velocity structure in Yunnan, Southwest China".TECTONOPHYSICS 471.3-4(2009):171-185.

入库方式： OAI收割

来源：地质与地球物理研究所

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