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Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation
Murodov, Davlatkhudzha1,2; Mi, Wang1; Murodov, Amirkhamza3; Oimuhmmadzoda, Ilhomjon2; Abdulov, Sherzod2,4; Xin, Wang1
2022-03-15
Source PublicationFRONTIERS IN EARTH SCIENCE
Volume10Pages:12
AbstractThe Cenozoic convergence between India and Asia has created Earth's thickest crust in the Pamir-Tibetan plateau, leading to broadly distributed deformation and extensive crustal shortening; however, the crustal deformation of the high plateau is still poorly constrained. The variation of the Moho topography and crustal composition beneath the Pamir-Tibetan plateau has an important correlation with the major tectonic units. In this study, the results of the receiver functions have been reviewed and analyzed to observe variations in the Moho depth and crustal Vp/Vs ratio beneath the Pamir-Tibetan plateau. We found a notable SE-NW-oriented deep Moho interface that starts from the southeast of the Tibetan plateau and continues to the eastern Pamir with a northward dipping direction, which may indicate the northern frontier of the decoupled lower crust of northward underthrusting of the Indian plate. In contrast, the deepest Moho beneath the Pamir plateau has a southward dipping direction indicating the southward underthrusting Asian plate. In general, the average crustal Vp/Vs ratio is relatively low beneath the South-Central Pamir (similar to 1.70), while it is relatively higher (similar to 1.75) under the Himalaya-Lhasa terrane, suggesting more felsic to intermediate rock composition with locally high values indicating a low-velocity zone, possibly caused by partial melting. Elevated Vp/Vs ratios are observed beneath the northern Pamir (>1.77) and Qiangtang and Songpan-Ganze terranes (>1.80), which can be related to the high mafic rock content and upwelling hot materials from the upper mantle. The Vp/Vs ratio beneath the Pamir-Tibetan plateau presents complex north-south variations with a relatively low crustal Vp/Vs ratio in the south, while it gradually increases toward the north of the Pamir and central-northern Tibet, which is probably caused by the joint effects of the northward underthrusting Indian lower crust and southward subduction of the Asian plate, the low-velocity zones within the mid-upper crust, and substantial crustal shortening and thickening. The low to average crustal Vp/Vs ratio throughout the plateau (except the central Tibet) indicates a limited amount of hot materials to support the low crustal channel flow model, instead suggesting that crustal thickening and shortening is the main uplifting mechanism of the Pamir-Tibetan plateau.
Keywordcrustal composition Vp Vs ratio Pamir-Tibetan plateau crustal structure continental subduction
DOI10.3389/feart.2022.821497
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems
WOS KeywordINDIAN LITHOSPHERE BENEATH ; HINDU-KUSH ; BREAK-OFF ; CONTINENTAL CHINA ; SUBDUCTION ; DEFORMATION ; ASIA ; CONSTRAINTS ; TECTONICS ; EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[42072211] ; second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0602] ; open foundation of MOE Key Laboratory of Western China's Environmental Systems[lzujbky-2021-kb01]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; open foundation of MOE Key Laboratory of Western China's Environmental Systems ; open foundation of MOE Key Laboratory of Western China's Environmental Systems
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000778686600001
PublisherFRONTIERS MEDIA SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105115
Collection新生代地质与环境院重点实验室
Corresponding AuthorXin, Wang
Affiliation1.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou, Peoples R China
2.Natl Acad Sci Tajikistan, Inst Geol Earthquake Engn & Seismol, Dushanbe, Tajikistan
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Murodov, Davlatkhudzha,Mi, Wang,Murodov, Amirkhamza,et al. Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation[J]. FRONTIERS IN EARTH SCIENCE,2022,10:12.
APA Murodov, Davlatkhudzha,Mi, Wang,Murodov, Amirkhamza,Oimuhmmadzoda, Ilhomjon,Abdulov, Sherzod,&Xin, Wang.(2022).Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation.FRONTIERS IN EARTH SCIENCE,10,12.
MLA Murodov, Davlatkhudzha,et al."Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation".FRONTIERS IN EARTH SCIENCE 10(2022):12.
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