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Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images
Xu, Q (Xu, Qiang)1,2; Zhao, JM (Zhao, Junmeng)1,2; Yuan, XH (Yuan, Xiaohui)3; Liu, HB (Liu, Hongbing)1,2; Pei, SP (Pei, Shunping)1; Xu, Q
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
2017
Volume122Issue:10Pages:8257-8269
DOI10.1002/2017JB014490
AbstractWe analyze the teleseismic waveform data recorded by 42 temporary stations from the Y2 and ANTILOPE-1 arrays using the P and S receiver function techniques to investigate the lithospheric structure beneath western Tibet. The Moho is reliably identified as a prominent feature at depths of 55-82km in the stacked traces and in depth migrated images. It has a concave shape and reaches the deepest location at about 80km north of the Indus-Yarlung suture (IYS). An intracrustal discontinuity is observed at 55km depth below the southern Lhasa terrane, which could represent the upper border of the eclogitized underthrusting Indian lower crust. Underthrusting of the Indian crust has been widely observed beneath the Lhasa terrane and correlates well with the Bouguer gravity low, suggesting that the gravity anomalies in the Lhasa terrane are induced by topography of the Moho. At 20km depth, a midcrustal low-velocity zone (LVZ) is observed beneath the Tethyan Himalaya and southern Lhasa terrane, suggesting a layer of partial melts that decouples the thrust/fold deformation of the upper crust from the shortening and underthrusting in the lower crust. The Sp conversions at the lithosphere-asthenosphere boundary (LAB) can be recognized at depths of 130-200km, showing that the Indian lithospheric mantle is underthrusting with a ramp-flat shape beneath southern Tibet and probably is detached from the lower crust immediately under the IYS. Our observations reconstruct the configuration of the underthrusting Indian lithosphere and indicate significant along strike variations.
Subject Area地球物理学
WOS IDWOS:000418577900043
Language英语
Indexed BySCI
KeywordHi-climb Experiment P-wave Tomography Southern Tibet Asthenosphere Boundary Joint Inversion Seismic Images Collision Zone Moho Beneath Lower Crust Mantle
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics ; Geochemistry & Geophysics
Cooperation Status国际
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7966
Collection图书馆
Corresponding AuthorXu, Q
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China.
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China.
3.Deutsch GeoForschungsZentrum GFZ, Potsdam, Germany.
Recommended Citation
GB/T 7714
Xu, Q ,Zhao, JM ,Yuan, XH ,et al. Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017,122(10):8257-8269.
APA Xu, Q ,Zhao, JM ,Yuan, XH ,Liu, HB ,Pei, SP ,&Xu, Q.(2017).Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(10),8257-8269.
MLA Xu, Q ,et al."Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122.10(2017):8257-8269.
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