Upper mantle anisotropy analysis around the western Altun Tagh fault

doi:10.6038/cjg20160508

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Upper mantle anisotropy analysis around the western Altun Tagh fault
	Feng Yong-Ge 1; Yu Yong 1; Chen Yong-Shun 1; Liang Xiao-Feng 2; Wang Peng 3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2016-05-01
卷号	59 期号:5 页码:1629-1636
关键词	Upper mantle anisotropy Craton distruction Asthenospheric flow The Altyn Tagh fault
DOI	10.6038/cjg20160508
文献子类	Article
英文摘要	We conducted SKS wave splitting method to analyze teleseismic data from broadband temporary seismic stations deployed by Peking University near Yutian, Xinjiang province in China at the boundary of the Tarim basin and Tibetan plateau. All the fast polarization directions share a common preferred E-W orientation in the study area, showing a good correlation with the strike of the Altun Tagh fault in the area. The delay times range from 0.93 s to 1.20 s. Considering all the shear wave splitting measurements around this area, we postulate that the E-W fast polarization direction may be caused by the eastward escaping mantle flow of the northern Tibet beneath the left-lateral slipping Altun Tagh fault, which is prevented from moving northward by the thick lithosphere of the Tarim basin. Our observation implies that the Altyn Tagh fault could be a large lithospheric-scale strike-slip fault which not only controls the surface deformation observed by GPS measurements but also the upper mantle flow observed by the SKS splitting observations such as our result reported here. Another interesting observation is that this E-W fast polarization direction could be seen at the stations extending north into the interior of the Tarim basin, indicating the cold "cratonic" Tarim lithosphere could be thermally eroded away by this eastward escaping Tibetan asthenospheric flow at its southern boundary. Our inference suggests that the reactivation of the cratonic lithosphere may also take place leading by the horizontal asthenospheric flow at the boundary.
WOS关键词	SEISMIC ANISOTROPY ; SPLITTING BENEATH ; PLATEAU EVIDENCE ; TIBETAN PLATEAU ; SKS ; LITHOSPHERE ; DEFORMATION ; CRUST
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000375637700008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53518]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Peking Univ, Sch Earth & Space Sci, Inst Theoret & Appl Geophys, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.China Earthquake Adm, Inst Earthquake Sci, Beijing 100036, Peoples R China
推荐引用方式 GB/T 7714	Feng Yong-Ge,Yu Yong,Chen Yong-Shun,et al. Upper mantle anisotropy analysis around the western Altun Tagh fault[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(5):1629-1636.
APA	Feng Yong-Ge,Yu Yong,Chen Yong-Shun,Liang Xiao-Feng,&Wang Peng.(2016).Upper mantle anisotropy analysis around the western Altun Tagh fault.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(5),1629-1636.
MLA	Feng Yong-Ge,et al."Upper mantle anisotropy analysis around the western Altun Tagh fault".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.5(2016):1629-1636.