气候变化领域集成服务门户(CCPortal): Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation

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DOI	10.3389/feart.2022.821497
	Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation
	Murodov, Davlatkhudzha; Mi, Wang; Murodov, Amirkhamza; Oimuhmmadzoda, Ilhomjon; Abdulov, Sherzod; Xin, Wang
通讯作者	Xin, W (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	The Cenozoic convergence between India and Asia has created Earth's thickest crust in the Pamir-Tibetan plateau, leading to broadly distributed deformation and extensive crustal shortening; however, the crustal deformation of the high plateau is still poorly constrained. The variation of the Moho topography and crustal composition beneath the Pamir-Tibetan plateau has an important correlation with the major tectonic units. In this study, the results of the receiver functions have been reviewed and analyzed to observe variations in the Moho depth and crustal Vp/Vs ratio beneath the Pamir-Tibetan plateau. We found a notable SE-NW-oriented deep Moho interface that starts from the southeast of the Tibetan plateau and continues to the eastern Pamir with a northward dipping direction, which may indicate the northern frontier of the decoupled lower crust of northward underthrusting of the Indian plate. In contrast, the deepest Moho beneath the Pamir plateau has a southward dipping direction indicating the southward underthrusting Asian plate. In general, the average crustal Vp/Vs ratio is relatively low beneath the South-Central Pamir (similar to 1.70), while it is relatively higher (similar to 1.75) under the Himalaya-Lhasa terrane, suggesting more felsic to intermediate rock composition with locally high values indicating a low-velocity zone, possibly caused by partial melting. Elevated Vp/Vs ratios are observed beneath the northern Pamir (>1.77) and Qiangtang and Songpan-Ganze terranes (>1.80), which can be related to the high mafic rock content and upwelling hot materials from the upper mantle. The Vp/Vs ratio beneath the Pamir-Tibetan plateau presents complex north-south variations with a relatively low crustal Vp/Vs ratio in the south, while it gradually increases toward the north of the Pamir and central-northern Tibet, which is probably caused by the joint effects of the northward underthrusting Indian lower crust and southward subduction of the Asian plate, the low-velocity zones within the mid-upper crust, and substantial crustal shortening and thickening. The low to average crustal Vp/Vs ratio throughout the plateau (except the central Tibet) indicates a limited amount of hot materials to support the low crustal channel flow model, instead suggesting that crustal thickening and shortening is the main uplifting mechanism of the Pamir-Tibetan plateau.
关键词	INDIAN LITHOSPHERE BENEATH HINDU-KUSH BREAK-OFF CONTINENTAL CHINA SUBDUCTION DEFORMATION ASIA CONSTRAINTS TECTONICS EVOLUTION
英文关键词	crustal composition; Vp; Vs ratio; Pamir-Tibetan plateau; crustal structure; continental subduction
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000778686600001
来源期刊	FRONTIERS IN EARTH SCIENCE
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/260673
推荐引用方式 GB/T 7714	Murodov, Davlatkhudzha,Mi, Wang,Murodov, Amirkhamza,et al. Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation[J]. 中国科学院青藏高原研究所,2022,10.
APA	Murodov, Davlatkhudzha,Mi, Wang,Murodov, Amirkhamza,Oimuhmmadzoda, Ilhomjon,Abdulov, Sherzod,&Xin, Wang.(2022).Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation.FRONTIERS IN EARTH SCIENCE,10.
MLA	Murodov, Davlatkhudzha,et al."Deep Crustal Structure Beneath the Pamir-Tibetan Plateau: Insights From the Moho Depth and Vp/Vs Ratio Variation".FRONTIERS IN EARTH SCIENCE 10(2022).