Lithospheric thickness and upper mantle anisotropy beneath the;northeastern Tibetan Plateau

doi:10.6038/cjg20130210

	Lithospheric thickness and upper mantle anisotropy beneath the;northeastern Tibetan Plateau
	Zhang Hong-Shuang 6; Teng Ji-Wen ; Tian Xiao-Bo ; Zhang Zhong-Jie ; Gao Rui 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2013
卷号	56 期号:2 页码:459-471
关键词	Northeastern Tibetan Plateau S receiver function Lithosphere-Asthenosphere Boundary SKS splitting measurement Uppermost mantle deformation
ISSN号	0001-5733
DOI	10.6038/cjg20130210
英文摘要	We present S receiver functions and SKS splitting measurements from the China Seismograph Network located in the Qinghai and Gansu provinces. Teleseismic data are used to interpret the structure of the Lithosphere-Asthenosphere Boundary (LAB) and the upper mantle deformation beneath the northeastern Tibetan Plateau (NETP) in regions north of the east Kunlun fault. Based on our observations, the depth of the L##AB#is 125 similar to 135 km beneath the northeastern Songpan-Ganzi block and the west Qinling orogen, 145 similar to 175 km beneath the Kunlun and Qilian block, and deepens to the Qaidam basin (175 similar to 190 km), Ordos craton (1,70 km), and Alashan platform (200 km). The NETP has a nearly uniform fast wave direction of NW-SE. These observations are different from those to the south of the Kunlun fault which are rotating clockwise from the inner plateau. The difference between fast directions across the Kunlun fault implies a sudden variation of the upper mantle deformation occurred there. Shear wave splitting delay times vary from 0.8 to 1.9 s. And data from beneath regions north of the Kunlun-Ayimaqin suture showed that delay time was positively correlated with lithospheric thickness. This indicates that the anisotropy may develop in the uppermost mantle, such as the lithosphere, beneath the NETP.
学科主题	固体地球物理学
WOS关键词	NORTH CHINA CRATON ; ALTYN TAGH FAULT ; SEISMIC ANISOTROPY ; RECEIVER ; FUNCTIONS ; CRUSTAL STRUCTURE ; EASTERN CHINA ; MARGIN ; EVOLUTION ; GROWTH ; ZONE
WOS研究方向	Geochemistry & Geophysics
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000315762400010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40147]
专题	中国地质科学院地质研究所
作者单位	1.[Zhang Hong-Shuang 2.Chinese Acad Geol Sci, Inst Geol, Minist Land & Resources, Beijing 100037, Peoples R China. 3.[Teng Ji-Wen 4.Tian Xiao-Bo 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China. 6.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang Hong-Shuang,Teng Ji-Wen,Tian Xiao-Bo,et al. Lithospheric thickness and upper mantle anisotropy beneath the;northeastern Tibetan Plateau[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(2):459-471.
APA	Zhang Hong-Shuang,Teng Ji-Wen,Tian Xiao-Bo,Zhang Zhong-Jie,&Gao Rui.(2013).Lithospheric thickness and upper mantle anisotropy beneath the;northeastern Tibetan Plateau.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(2),459-471.
MLA	Zhang Hong-Shuang,et al."Lithospheric thickness and upper mantle anisotropy beneath the;northeastern Tibetan Plateau".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.2(2013):459-471.