Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images

doi:10.1002/2017JB014490

	Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images
	Zhao, JM (Zhao, Junmeng)1,2; Xu, Q (Xu, Qiang)1,2; Yuan, XH (Yuan, Xiaohui)3; Liu, HB (Liu, Hongbing)1,2; Pei, SP (Pei, Shunping)1; Xu, Q
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2017
卷号	122 期号:10 页码:8257-8269
关键词	Hi-climb Experiment P-wave Tomography Southern Tibet Asthenosphere Boundary Joint Inversion Seismic Images Collision Zone Moho Beneath Lower Crust Mantle
DOI	10.1002/2017JB014490
文献子类	Article
英文摘要	We 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.
学科主题	地球物理学
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000418577900043
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7966]
专题	青藏高原研究所_图书馆
通讯作者	Xu, Q
作者单位	1.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.
推荐引用方式 GB/T 7714	Zhao, JM ,Xu, Q ,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	Zhao, JM ,Xu, Q ,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	Zhao, JM ,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.