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East-West Differential Underthrusting of the Indian Lithospheric Plate Beneath Central Tibet Revealed by Imaging V-P/V-S
Si, Shaokun1; Gao, Rui1,2; Tian, Xiaobo3,4
2019-09-11
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Pages17
AbstractAlthough numerous research studies have already provided basic information on deeper lithospheric structure under Tibet, the northernmost edge and the geometry of the northward underthrusting of the Indian mantle lithosphere are yet to be understood. The P wave to S wave velocity ratio (V-P/V-S) can provide more insight into the mantle physical state than either V-P or V-S alone, owing to their different sensitivities to partial melting, temperature, and composition. High V-P/V-S usually indicates that partial melting exists in the upper mantle, while anomalously low V-P/V-S in the upper mantle reflects the enrichment of orthopyroxene in the subduction zone mantle wedge. Using teleseismic records of 164 broadband stations deployed in central Tibet, we obtained a high-resolution velocity ratio image of the upper mantle. A striking difference is seen between western and eastern Tibet. A distinct high V-P/V-S zone exists at relatively a shallow depth (<200 km) to the west of the Yadong-Gulu Rift, while the eastern part exhibits a shallow region (south of the Bangong-Nujiang suture in the depth range of 120-160 km) with abnormally low V-P/V-S. Moreover, there are high V-P/V-S areas existing below 270-km depth, and it appears further east at depth of 340 km than that at depth of 270 km. We propose that this difference reflects different geometries of the underthrusting Indian mantle lithosphere from west to east. Slab tearing under eastern Tibet and lithospheric delamination under western Tibet are likely good candidates to explain the observation.
Keyworddifferential underthrusting imaging Vp Vs receiver function Indian lithospheric mantle central Tibet
DOI10.1029/2018JB017259
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordUPPER-MANTLE ; SEISMIC ANISOTROPY ; SOUTHERN TIBET ; WAVE VELOCITY ; ULTRAPOTASSIC MAGMATISM ; GEOCHEMICAL VARIATIONS ; TECTONIC EVOLUTION ; POISSONS RATIO ; NORTHERN TIBET ; CRUST BENEATH
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0600301] ; strategic Priority Research Program (B) of the Chinese Academy of Science[XDB03010700] ; National Natural Science Foundation of China[41774051] ; National Natural Science Foundation of China[41590863] ; National Natural Science Foundation of China[41430213]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; strategic Priority Research Program (B) of the Chinese Academy of Science ; strategic Priority Research Program (B) of the Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000486908000001
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93711
Collection岩石圈演化国家重点实验室
Corresponding AuthorSi, Shaokun
Affiliation1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangzhou, Guangdong, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Si, Shaokun,Gao, Rui,Tian, Xiaobo. East-West Differential Underthrusting of the Indian Lithospheric Plate Beneath Central Tibet Revealed by Imaging V-P/V-S[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019:17.
APA Si, Shaokun,Gao, Rui,&Tian, Xiaobo.(2019).East-West Differential Underthrusting of the Indian Lithospheric Plate Beneath Central Tibet Revealed by Imaging V-P/V-S.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,17.
MLA Si, Shaokun,et al."East-West Differential Underthrusting of the Indian Lithospheric Plate Beneath Central Tibet Revealed by Imaging V-P/V-S".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2019):17.
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