气候变化领域集成服务门户(CCPortal): Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images

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DOI	10.1002/2017JB014490
	Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images
	Xu, Qiang; Zhao, Junmeng; Yuan, Xiaohui; Liu, Hongbing; Pei, Shunping
通讯作者	Xu, Q (通讯作者)
发表日期	2017
ISSN	2169-9313
EISSN	2169-9356
起始页码	8257
结束页码	8269
卷号	122 期号:10
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.
关键词	P-WAVE TOMOGRAPHY SOUTHERN TIBET ASTHENOSPHERE BOUNDARY JOINT INVERSION SEISMIC IMAGES MOHO BENEATH MANTLE CRUSTAL PLATEAU COLLISION
英文关键词	receiver functions; CCP stacking; LAB; western Tibet
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000418577900043
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258959
推荐引用方式 GB/T 7714	Xu, Qiang,Zhao, Junmeng,Yuan, Xiaohui,et al. Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images[J]. 中国科学院青藏高原研究所,2017,122(10).
APA	Xu, Qiang,Zhao, Junmeng,Yuan, Xiaohui,Liu, Hongbing,&Pei, Shunping.(2017).Detailed Configuration of the Underthrusting Indian Lithosphere Beneath Western Tibet Revealed by Receiver Function Images.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(10).
MLA	Xu, Qiang,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).