Upper mantle velocity structure and dynamic features of the Tibetan plateau

doi:10.6038/cjg20141220

	Upper mantle velocity structure and dynamic features of the Tibetan plateau
	Xu Yi 1; Liu Jin-Song 1; Huang Zhong-Xian 2; Yang Xiao-Tao 1; Chen Chen 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2014-12-01
卷号	57 期号:12 页码:4085-4096
关键词	Tibetan plateau Seismic tomography Upper mantle Velocity structure
ISSN号	0001-5733
DOI	10.6038/cjg20141220
文献子类	Article
英文摘要	We analyze the upper mantle structure of western China based on tomographic results. The results show that the uppermost mantle of the Tibetan plateau and western Yunnan are widely dominated by slow seismic velocities. At greater depths, however, these slow velocities are mostly concentrated in the Qiangtang area of northern Tibet, the Songpan-Ganzi area of eastern Tibet and western Yunnan, which are surrounded by fast velocities in the India, Tarim, Qaidam, Ordos and Sichuan basins. A synthetic analysis indicates that the velocity variations at these depths are closely related to the lithospheric mantle structure and deep dynamic features of the Tibetan plateau and surrounding areas. Among them, the slow velocities beneath the Qiangtang area reflect the partial mantle upwelling produced by the northward penetration of the Indian continental lithosphere into the Tibetan plateau; the slow velocities beneath the Songpan-Ganzi terrain are related to the lateral deep flow of eastern Tibet and the obstruction of the rigid lithosphere of the Sichuan basin, while the slow velocities beneath western Yunnan is apparently affected by the eastward subduction of the India-Burma plate. These three areas are considered to be underlain by an anomalous mantle. On the contrary, the fast upper mantle velocities of the areas surrounding the Tibetan plateau, such as the India continent, Tarim, Qaidam, Ordos and Sichuan basins, reflect the features of the lithospheric mantle structure in tectonically stable continental blocks. We infer that the mantle upwelling and ductile deformation are not distributed throughout the Tibetan plateau, rather concentrated in the Qiangtang Songpan-Ganzi and western Yunnan, which has resulted in the thinning of the lithosphere and volcanic and magmatic activities.
WOS关键词	SEISMIC ANISOTROPY BENEATH ; REHAI GEOTHERMAL-FIELD ; PN-WAVE VELOCITY ; SURROUNDING REGIONS ; SURFACE-WAVE ; ADJACENT REGIONS ; VOLCANIC-ROCKS ; COLLISION ZONE ; YUNNAN REGION ; S-WAVE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000347270700021
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85725]
专题	中国科学院地质与地球物理研究所
通讯作者	Xu Yi
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing 100029, Peoples R China 2.China Earthquake Adm, Inst Crustal Dynam, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Xu Yi,Liu Jin-Song,Huang Zhong-Xian,et al. Upper mantle velocity structure and dynamic features of the Tibetan plateau[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2014,57(12):4085-4096.
APA	Xu Yi,Liu Jin-Song,Huang Zhong-Xian,Yang Xiao-Tao,&Chen Chen.(2014).Upper mantle velocity structure and dynamic features of the Tibetan plateau.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,57(12),4085-4096.
MLA	Xu Yi,et al."Upper mantle velocity structure and dynamic features of the Tibetan plateau".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 57.12(2014):4085-4096.