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Deformation of crust and upper mantle in central Tibet caused by the northward subduction and slab tearing of the Indian lithosphere: New evidence based on shear wave splitting measurements
Wu, Chenglong1; Tian, Xiaobo1,2; Xu, Tao1,2; Liang, Xiaofeng1; Chen, Yun1; Taylor, Michael3; Badal, Jose4; Bai, Zhiming1; Duan, Yaohui5; Yu, Guiping1,6; Teng, Jiwen1
2019-05-15
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
Volume514Pages:75-83
AbstractShear-wave splitting provides insight into geodynamic processes such as lithospheric deformation and upper mantle flow. This study presents shear wave splitting parameters determined from XKS (SKS, SKKS and PKS) and Pms phases (from receiver functions) recorded by the 2D seismic array, SANDWICH, deployed in central Tibet from November 2013 to April 2016. The XKS splitting measurements show a generally strong anisotropy with an average of 1.3 s, that even includes 17 stations with delay times no less than 2.0 s. Interestingly, significantly weak splitting is also observed between Nam Tso and Siting Tso near 90 degrees E. Spatial coherence analysis of the splitting parameters indicates an upper asthenospheric source as the primary cause of seismic anisotropy in the study region. The regionally dominant ENE-WSW oriented upper-mantle anisotropy can emerge from the corner flow in the overlying mantle wedge induced by the subduction of the Indian lithospheric slab. The crustal anisotropy obtained through Pms splitting analysis might reflect lattice preferred orientation of anisotropic minerals formed by the ENE oriented middle-lower crustal flow, with a minor contribution to the strong anisotropy. The weak splitting observations in the east are likely caused by the nearly vertical alpha-axis of olivine induced by upwelling asthenosphere at a slab tear in the Indian lithosphere. (C) 2019 Elsevier B.V. All rights reserved.
Keywordseismic anisotropy shear wave splitting subduction of the Indian lithospheric slab asthenosphere upwelling crustal flow central Tibet
DOI10.1016/j.epsl.2019.02.037
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; 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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; 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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; 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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; 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
WOS KeywordSEISMIC ANISOTROPY BENEATH ; EAST-WEST EXTENSION ; SOUTHERN ; PLATEAU ; MODEL ; QIANGTANG ; SANDWICH ; ASIA
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFC0600301] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB03010700] ; National Natural Science Foundation of China[41804058] ; National Natural Science Foundation of China[41674064] ; National Natural Science Foundation of China[41522401] ; National Natural Science Foundation of China[41474068] ; National Natural Science Foundation of China[41574056]
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; 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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; 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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; 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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000466054900007
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/91390
Collection岩石圈演化国家重点实验室
Corresponding AuthorTian, Xiaobo; Xu, Tao
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Univ Kansas, Dept Geol, 1735 Jayhawk Blvd, Lawrence, KS 66045 USA
4.Univ Zaragoza, Phys Earth, Sci B, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
5.Chinese Univ Hong Kong, Earth Syst Sci Programme, Fac Sci, Sha Tin, Hong Kong, Peoples R China
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wu, Chenglong,Tian, Xiaobo,Xu, Tao,et al. Deformation of crust and upper mantle in central Tibet caused by the northward subduction and slab tearing of the Indian lithosphere: New evidence based on shear wave splitting measurements[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,514:75-83.
APA Wu, Chenglong.,Tian, Xiaobo.,Xu, Tao.,Liang, Xiaofeng.,Chen, Yun.,...&Teng, Jiwen.(2019).Deformation of crust and upper mantle in central Tibet caused by the northward subduction and slab tearing of the Indian lithosphere: New evidence based on shear wave splitting measurements.EARTH AND PLANETARY SCIENCE LETTERS,514,75-83.
MLA Wu, Chenglong,et al."Deformation of crust and upper mantle in central Tibet caused by the northward subduction and slab tearing of the Indian lithosphere: New evidence based on shear wave splitting measurements".EARTH AND PLANETARY SCIENCE LETTERS 514(2019):75-83.
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