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Complex N-S variations in Moho depth and V (p)/V (s) ratio beneath the western Tibetan Plateau as revealed by receiver function analysis
Liu, HB (Liu, Hongbing)1,3; MuroD (Murodov, Davlatkhudzha)dov,1,2; Zhao, JM (Zhao, Junmeng)1,2,3; Xu, Q (Xu, Qiang)1,3; Pei, SP (Pei, Shunping)1
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
2018-08-01
卷号214期号:2页码:895-906
关键词Upper-mantle Structure Lithosphere Beneath Crustal Structure Seismic Evidence Northern Tibet Southern Tibet Altyn Tagh Evolution Tomography Himalaya
ISSN号0956-540X
DOI10.1093/gji/ggy170
英文摘要

We present herein detailed images of the Moho depth and V-p/V-s ratio along ANTILOPE-1 profile beneath the western Tibetan Plateau derived from receiver function analysis. Along the ANTILOPE-1 profile, a rapidly northward-dipping Moho extends from similar to 50 km below the Himalaya to similar to 80 km across the Indus-Yarlung suture, shallowing to similar to 66 km under the central Lhasa terrane. The Moho depth shows a dramatic increase from similar to 66 km north of the Bangong-Nujiang suture to similar to 93 km beneath central Qiangtang terrane where it reaches the maximum depth observed along this profile before steeply rising to similar to 73 km. We interpret both the 15 and 20 km offsets of Moho depth occurring beneath the central Lhasa and central Qiangtang terranes as being related to the northern frontiers of the decoupled underthrusting Indian lower crust and lithospheric mantle, respectively. The Moho remains at a depth of similar to 70 km with a slight undulation beneath the northern Qiangtang and Songpan-Ganzi terranes, and then abruptly shallows to similar to 45 km near the Altyn Tagh Fault. The similar to 25 km Moho offset observed at the conjunction of the Tarim Basin and the Altyn Tagh mountain range suggests that the crustal shortening is achieved by pure shear thickening without much underthrusting. The average crustal V-p/V-s ratio changes from 1.66 to 1.80 beneath the Himalaya, the Lhasa terrane and the Tarim Basin indicating a felsic-to-intermediate composition. However, higher V-p/V-s ratios between 1.76 and 1.83 (except for a few outlying low values) are found beneath the Qiangtang and Songpan-Ganzi terranes, which could be attributed to the joint effects of the more mafic composition and partial melt within the crust. The Moho depth and V-p/V-s ratio exhibit complex N-S variations along this profile, which can be attributed to the joint effects of Indian lower crust underthrusting, the low-velocity zone of the mid-upper crust, crustal shortening and thickening, and other involved dynamic mechanisms.

学科主题地质学
WOS研究方向Geochemistry & Geophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000448238600008
内容类型期刊论文
源URL[http://ir.itpcas.ac.cn/handle/131C11/8572]  
专题青藏高原研究所_图书馆
通讯作者MuroD (Murodov, Davlatkhudzha)dov,
作者单位1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, CEPS, 19 A Yuquan Rd, Beijing 100049, Shijingshan, 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
Liu, HB ,MuroD ,Zhao, JM ,et al. Complex N-S variations in Moho depth and V (p)/V (s) ratio beneath the western Tibetan Plateau as revealed by receiver function analysis[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,214(2):895-906.
APA Liu, HB ,MuroD ,Zhao, JM ,Xu, Q ,&Pei, SP .(2018).Complex N-S variations in Moho depth and V (p)/V (s) ratio beneath the western Tibetan Plateau as revealed by receiver function analysis.GEOPHYSICAL JOURNAL INTERNATIONAL,214(2),895-906.
MLA Liu, HB ,et al."Complex N-S variations in Moho depth and V (p)/V (s) ratio beneath the western Tibetan Plateau as revealed by receiver function analysis".GEOPHYSICAL JOURNAL INTERNATIONAL 214.2(2018):895-906.
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