Structure of the mantle transition zone beneath the southeastern Tibetan plateau revealed by P-wave receiver functions

doi:10.6038/cjg2018L0182

	Structure of the mantle transition zone beneath the southeastern Tibetan plateau revealed by P-wave receiver functions
	Bai YiMing 1,2; Ai YinShuang 1,2,3; Jiang MingMing 1,3; He YuMei 1,3; Chen QiFu 1,2
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2018-02-01
卷号	61 期号:2 页码:570-583
关键词	Mantle transition zone Southeastern Tibetan plateau P-wave receiver functions
ISSN号	0001-5733
DOI	10.6038/cjg2018L0182
文献子类	Article
英文摘要	The deep structure of the southeastern Tibetan plateau is of great importance to a better understanding of the India-Eurasia collision as well as the evolution of the Tibetan plateau. In this study, we collected waveform data of 566 permanent and temporary seismic stations in southeastern Tibetan plateau, then extracted a total of 77853 high quality P-wave receiver functions using the maximum entropy deconvolution method. By the Common Conversion Point (CCP) stacking technique, we mapped the topography of the 410- and 660-km discontinuities ('410' and '660' hereinafter), and further investigated the lateral variation of the mantle transition zone (MTZ) beneath this region. The background velocity model deduced from H-kappa stacking results and a previous body-wave tomographic research were applied to the correction of the crustal and upper mantle heterogeneities beneath southeastern Tibetan plateau for CCP stacking. Our results reveal two significantly thickened MTZ anomalies aligned nearly in the south north direction. The magnitudes of both anomalies are similar to 30 km above the global average of 250 km. The southern anomaly located beneath the central-Yunnan sub-block and the Indo-China block is characterized by a slightly deeper '410' and a greater-than-normal '660', while the northern anomaly beneath western Sichuan has an uplifted '410' and a depressed '660'. Combining with previous studies in the adjacent regions, we suggest that after slab break-off between the Indian plate and Neo-Tethys oceanic plate, the remnant of the latter stagnating at the bottom of the MTZ may have caused the southern anomaly in our receiver function images. The anomaly in the north, on the other hand, might be the consequence of the delamination of the overlying lithosphere sinking into the MTZ. The origin of the Tengchong volcano is probably connected to the upwelling of the hot and wet asthenospheric material caused by the slab break-off process.
WOS关键词	WESTERN YANGTZE CRATON ; CRUSTAL STRUCTURE ; EASTERN TIBET ; SE TIBET ; SEISMIC TOMOGRAPHY ; SICHUAN BASIN ; AUTOREGRESSIVE DECONVOLUTION ; DISCONTINUITIES BENEATH ; LITHOSPHERIC STRUCTURE ; INTRAPLATE VOLCANISM
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000425840900016
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82903]
专题	中国科学院地质与地球物理研究所
通讯作者	Bai YiMing
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Bai YiMing,Ai YinShuang,Jiang MingMing,et al. Structure of the mantle transition zone beneath the southeastern Tibetan plateau revealed by P-wave receiver functions[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(2):570-583.
APA	Bai YiMing,Ai YinShuang,Jiang MingMing,He YuMei,&Chen QiFu.(2018).Structure of the mantle transition zone beneath the southeastern Tibetan plateau revealed by P-wave receiver functions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(2),570-583.
MLA	Bai YiMing,et al."Structure of the mantle transition zone beneath the southeastern Tibetan plateau revealed by P-wave receiver functions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.2(2018):570-583.