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Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results

文献类型：期刊论文

作者Zhou, Beibei1,2,3; Liang, Xiaofeng1,3; Lin, Guoqing4; Tian, Xiaobo1,5; Zhu, Gaohua6; Mechie, James7; Teng, Jiwen1,3
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2019-05-01
卷号124期号:5页码:4654-4672
关键词central Tibet seismic tomography attenuation upper crust conjugate strike-slip fault SANDWICH
ISSN号2169-9313
DOI10.1029/2018JB016653
英文摘要A series of conjugate strike-slip faults is the most prominent geologic feature in central Tibet and is considered to accommodate east-west extension and coeval north-south contraction. The development mechanism of the conjugate strike-slip fault system is under debate because of unclear crustal physical properties and compositional variations. P and S wave arrivals from 414 local earthquakes recorded by the temporary Seismic Array Integrated Detection for a Window of Indian Continental Head array and the permanent China National Seismic Network were used for the velocity tomography, with additional P and S wave arrivals from 12 shots of the International Deep Profiling of Tibet and the Himalaya III reflection/refraction profile. The local earthquakes were simultaneously relocated with the updated velocity models. We also inverted for a three-dimensional upper crustal Qp model with the same earthquake data set. The Vp structure near the surface shows that low-Vp anomalies generally correspond to sedimentary basins and high-Vp anomalies are related to exhumed metamorphic blocks in the study area. Relatively low Vp/Vs ratios in the upper crust indicate widely distributed quartz-rich rocks. The low-Vp zone from 0- to 10-km depth (resolving depth limit) is spatially correlated with the Bangong-Nujiang suture, possibly reflecting the compositional difference along the ophiolitic melange belt accompanied by twin volcanic arcs from a double-sided subduction. This interpretation is supported by relatively heterogeneous Qp values. This low-velocity zone also implies relatively uniform stress and continuous deformation in the upper crust of central Tibet. The relatively weak materials in at least the upper crust would result in strain concentration and help the development of the conjugate strike-slip fault system along the Bangong-Nujiang suture.
WOS关键词BANGONG-NUJIANG SUTURE ; EAST-WEST EXTENSION ; SOUTHERN TIBET ; QIANGTANG BASIN ; HEAT-FLOW ; PLATEAU ; DEFORMATION ; CONSTRAINTS ; ASIA ; LITHOSPHERE
资助项目Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB03010700] ; National Natural Science Foundation of China[41574056] ; National Natural Science Foundation of China[41404051] ; Youth Innovation Promotion Association, CAS[2017093]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000477721500022
出版者AMER GEOPHYSICAL UNION
资助机构Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/92921]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Liang, Xiaofeng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
4.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Dept Marine Geosci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA
5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
6.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Hong Kong, Peoples R China
7.Deutsch GeoForschungsZentrum GFZ, Sect Geophys Deep Sounding, Potsdam, Germany
推荐引用方式
GB/T 7714		 Zhou, Beibei,Liang, Xiaofeng,Lin, Guoqing,et al. Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(5):4654-4672.
APA Zhou, Beibei.,Liang, Xiaofeng.,Lin, Guoqing.,Tian, Xiaobo.,Zhu, Gaohua.,...&Teng, Jiwen.(2019).Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(5),4654-4672.
MLA Zhou, Beibei,et al."Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.5(2019):4654-4672.

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来源：地质与地球物理研究所

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