气候变化领域集成服务门户(CCPortal): P-wave tomography and dynamics of the crust and upper mantle beneath western Tibet

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DOI	10.1016/j.gr.2013.06.020
	P-wave tomography and dynamics of the crust and upper mantle beneath western Tibet
	Zhao, Junmeng; Zhao, Dapeng; Zhang, Heng; Liu, Hongbing; Huang, Ying; Cheng, Honggang; Wang, Wei
通讯作者	Zhao, JM (通讯作者)
发表日期	2014
ISSN	1342-937X
EISSN	1878-0571
起始页码	1690
结束页码	1699
卷号	25 期号:4
英文摘要	The continental collision between the Indian and Asian plates plays a key role in the geologic and tectonic evolution of the Tibetan plateau. In this article we present high-resolution tomographic images of the crust and upper mantle derived from a large number of high-quality seismic data from the ANTILOPE project in western Tibet. Both local and distant earthquakes were used in this study and 35,115 P-wave arrival times were manually picked from the original seismograms. Geological and geochemical results suggested that the subducting Indian plate has reached northward to the Lhasa terrane, whereas our new tomography shows that the Indian plate is currently sub-horizontal and underthrusting to the Jinsha river suture at depths of similar to 100 to similar to 250 km, suggesting that the subduction process has evolved over time. The Asian plate is also imaged clearly from the surface to a depth of similar to 100 km by our tomography, and it is located under the Tarim Basin north of the Altyn Tagh Fault. There is no obvious evidence to show that the Asian plate has subducted beneath western Tibet. The Indian and Asian plates are separated by a prominent low-velocity zone under northern Tibet. We attribute the low-velocity zone to mantle upwelling, which may account for the warm crust and upper mantle beneath that region, and thus explain the different features of magmatism between southern and northern Tibet. But the upwelling may not penetrate through the whole crust. We propose a revised geodynamic model and suggest that the high-velocity zones under Lhasa terrane may reflect a cold crust which has interrupted the crustal flow under the westernmost Tibetan plateau. (C) 2013 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	CONTINENTAL COLLISION ZONES INDIAN LITHOSPHERE BENEATH TECTONIC EVOLUTION LATERAL EXTRUSION SUBDUCTION-ZONE EVEREST MASSIF SLAB BREAKOFF DEFORMATION PLATEAU HIMALAYA
英文关键词	Tibetan plateau; Seismic tomography; Subduction processes; Mantle dynamics; India-Asia collision
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000347279400026
来源期刊	GONDWANA RESEARCH
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/258266
推荐引用方式 GB/T 7714	Zhao, Junmeng,Zhao, Dapeng,Zhang, Heng,et al. P-wave tomography and dynamics of the crust and upper mantle beneath western Tibet[J]. 中国科学院青藏高原研究所,2014,25(4).
APA	Zhao, Junmeng.,Zhao, Dapeng.,Zhang, Heng.,Liu, Hongbing.,Huang, Ying.,...&Wang, Wei.(2014).P-wave tomography and dynamics of the crust and upper mantle beneath western Tibet.GONDWANA RESEARCH,25(4).
MLA	Zhao, Junmeng,et al."P-wave tomography and dynamics of the crust and upper mantle beneath western Tibet".GONDWANA RESEARCH 25.4(2014).