气候变化领域集成服务门户(CCPortal): Deep crustal structure across northeastern Tibet from P receiver functions

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DOI	10.1016/j.pepi.2023.107048
	Deep crustal structure across northeastern Tibet from P receiver functions
	Murodov, Davlatkhudzha; Zhao, Junmeng; Wang, Xin; Murodov, Murodkhudzha; Shah, Syed Tallataf Hussain; Murodov, Azamdzhon; Faizulloev, Shohnavaz
发表日期	2023
ISSN	0031-9201
EISSN	1872-7395
卷号	341
英文摘要	The uplift mechanism and deep crustal deformation of the northeast of the Tibetan plateau in response to the Cenozoic India-Asian collision are still poorly constrained. Previous studies linked the uplift mechanism of the northeast of Tibet to the southward underthrusting of the Asian mantle lithosphere and the northward subduction of the Indian plate; yet, the details of crustal properties and thickening mechanism beneath the northeast of Tibet remain controversial. To shed light on the uplift mechanism of the northeast of the Tibetan plateau, we present a detailed image of the crustal structure beneath northeastern Tibet using teleseismic P receiver functions from 54 temporary broadband seismic stations. The Moho beneath the Kunlun Shan reaches similar to 66 km but abruptly shallows to similar to 40 km at the conjunction of the Kunlun and Qaidam, marking the boundary of northern and central Tibet. The Moho has a convex shape beneath the Qaidam basin and gently undulates northward beneath the Qilian Shan, and substantially shallows to similar to 48-50 km under the Alashan block without any Moho offset. The undulating Moho and the absence of any Moho disturbance suggest that crustal thickening and shortening is the main driving mechanism for the northeastern plateau uplift. The average Vp/Vs ratio (similar to 1.75) beneath northeastern Tibet is indicative of a felsic to intermediate composition without a prominent low-velocity zone or low-viscosity channel in the middle to lower crust. Thus, the moderate crustal Vp/Vs ratio excludes the crustal channel flow as a primary uplift mechanism, implying that the horizontal crustal shortening and vertical thickening is responsible for creating the thick crust of northeastern Tibet.
关键词	Crustal structure Receiver function Crustal composition Continental subduction Tibetan plateau
英文关键词	UPPER-MANTLE STRUCTURE; CENOZOIC TECTONIC EVOLUTION; LOW-VELOCITY ZONE; QILIAN-SHAN; QAIDAM BASIN; SEISMIC EVIDENCE; NORTHERN MARGIN; LITHOSPHERIC STRUCTURE; KUNLUN FAULT; NE TIBET
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001041333300001
来源期刊	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282680
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Lanzhou University; Chinese Academy of Sciences; Xinjiang Institute of Ecology & Geography, CAS; COMSATS University Islamabad (CUI); Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Academy of Sciences of Republic of Tajikistan; Institute of Geology, Seismological Construction & Seismology; Tibet University; Lanzhou University
推荐引用方式 GB/T 7714	Murodov, Davlatkhudzha,Zhao, Junmeng,Wang, Xin,et al. Deep crustal structure across northeastern Tibet from P receiver functions[J]. 中国科学院青藏高原研究所,2023,341.
APA	Murodov, Davlatkhudzha.,Zhao, Junmeng.,Wang, Xin.,Murodov, Murodkhudzha.,Shah, Syed Tallataf Hussain.,...&Faizulloev, Shohnavaz.(2023).Deep crustal structure across northeastern Tibet from P receiver functions.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,341.
MLA	Murodov, Davlatkhudzha,et al."Deep crustal structure across northeastern Tibet from P receiver functions".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 341(2023).