气候变化领域集成服务门户(CCPortal): Seismic-velocity structure of the lithosphere beneath the southeastern margin of the Tibetan Plateau: Insights into geodynamic processes and deformation mechanisms

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DOI	10.1016/j.gr.2023.12.021
	Seismic-velocity structure of the lithosphere beneath the southeastern margin of the Tibetan Plateau: Insights into geodynamic processes and deformation mechanisms
	Hu, Jiafu; Yang, Haiyan; Peng, Hengchu; Badal, Jose
发表日期	2024
ISSN	1342-937X
EISSN	1878-0571
起始页码	130
卷号	130
英文摘要	The southeastern margin of the Tibetan Plateau is a tectonic transition zone between the Tibetan Plateau and Yangtze Craton of the South China Block. The lithosphere beneath the western corner of Yangtze Craton was not only modified by magma underplating and intraplating associated with the Emeishan plume during the Permian but has also been affected by Tibetan Plateau orogenesis since the early Cenozoic. Seismic-wave velocity structures of lithosphere can provide information about the mechanisms of plateau deformation and expansion, including analysis of P-wave receiver functions, surface-wave dispersion, and body-wave travel-time data. During the last decade, several models of lithospheric seismic velocity based on such data have been obtained for the southeastern Tibet. However, these models carry uncertainty because of the inherent lack of uniqueness in the data inversion process. In this study, we review published lithospheric seismic-velocity models of the southeastern margin of the Tibetan Plateau and discuss possible interpretations of the formation mechanism of large-scale low- or highvelocity zones. Most of the reviewed models reveal a large-scale NNE-SSW-trending high-velocity zone in the crust beneath the core of the Emeishan large igneous province that separates two large-scale lowvelocity zones and may act as a barrier to lower-crustal flow from central Tibet. We argue that this largescale high-velocity zone is located primarily in the middle-lower crust rather than in the upper or entire crust and that it represents the track of the Emeishan plume hotspot. The lateral extrusion of rigid blocks is inferred to be the dominant crustal-deformation mode in the southeastern margin of the Tibetan Plateau, whereas deformation induced by hypothesised lower-crustal flow may be limited to localised regions. However, both the lateral extrusion of rigid blocks and lower-crustal flow may be coexistent processes causing the observed crustal deformation pattern beneath the northern Sichuan-Yunnan diamond-shaped block. (c) 2024 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
英文关键词	Seismic -velocity models; Emeishan mantle plume; Lower -crustal flow; Rigid -block lateral extrusion; Plume -strengthened lithosphere
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001176490100001
来源期刊	GONDWANA RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/292089
作者单位	Yunnan University; University of Zaragoza
推荐引用方式 GB/T 7714	Hu, Jiafu,Yang, Haiyan,Peng, Hengchu,et al. Seismic-velocity structure of the lithosphere beneath the southeastern margin of the Tibetan Plateau: Insights into geodynamic processes and deformation mechanisms[J],2024,130.
APA	Hu, Jiafu,Yang, Haiyan,Peng, Hengchu,&Badal, Jose.(2024).Seismic-velocity structure of the lithosphere beneath the southeastern margin of the Tibetan Plateau: Insights into geodynamic processes and deformation mechanisms.GONDWANA RESEARCH,130.
MLA	Hu, Jiafu,et al."Seismic-velocity structure of the lithosphere beneath the southeastern margin of the Tibetan Plateau: Insights into geodynamic processes and deformation mechanisms".GONDWANA RESEARCH 130(2024).