气候变化领域集成服务门户(CCPortal): Southeastward extrusion of the Tibetan Plateau limited by the strong Emeishan large igneous province from earthquake surface wave tomography

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DOI	10.1016/j.pepi.2024.107153
	Southeastward extrusion of the Tibetan Plateau limited by the strong Emeishan large igneous province from earthquake surface wave tomography
	Fu, Yuanyuan V.; Li, Lun; Ma, Junwei; Sun, Nannan
发表日期	2024
ISSN	0031-9201
EISSN	1872-7395
起始页码	348
卷号	348
英文摘要	Active deformation is ongoing in the southeastern margin of the Tibetan Plateau due to the collision of the Indian and Eurasian continents. While large-scale motion of the surface occurs, the nature of deformation at depth remains unresolved. We construct new lithospheric seismic anisotropic (radially and azimuthally) and shear-wave velocity models using fundamental-mode Rayleigh- and Love-wave phase velocity at periods of 20-100 s obtained from the ChinArray experiment to constrain the deformation style of the crust and upper mantle in the southeastern margin of the Tibetan Plateau. The results show that the uppermost mantle (Moho-90 km) underneath the Tibetan Plateau and northwestern part of the western Yangtze block are characterized with NE-SW oriented azimuthal anisotropy, prominent slow velocity and negative radial anisotropy (V-SH < V-SV). We interpret that this seismic pattern reflects the southeastward extrusion of the Tibetan uppermost mantle that may thermally erode the northwestern edge and result in the vertically coherent fabric due to the barriers of the left strong Emeishan large igneous province (i.e., south of the western Yangtze block) dominated by the high shear wave velocities. Low velocity anomaly, N-S trending azimuthal anisotropy, and negative radial anisotropy in the uppermost mantle beneath the eastern Yangtze block are most probably associated with vertical migration of hot mantle material from the lithosphere delamination and/or a branch of the Hainan plume.
英文关键词	Shear wave velocity; Azimuthal anisotropy; Radial anisotropy; Southeastern Tibetan Plateau
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001186952600001
来源期刊	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301674
作者单位	China Earthquake Administration; Institute of Earthquake Forecasting, CEA; Sun Yat Sen University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai)
推荐引用方式 GB/T 7714	Fu, Yuanyuan V.,Li, Lun,Ma, Junwei,et al. Southeastward extrusion of the Tibetan Plateau limited by the strong Emeishan large igneous province from earthquake surface wave tomography[J],2024,348.
APA	Fu, Yuanyuan V.,Li, Lun,Ma, Junwei,&Sun, Nannan.(2024).Southeastward extrusion of the Tibetan Plateau limited by the strong Emeishan large igneous province from earthquake surface wave tomography.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,348.
MLA	Fu, Yuanyuan V.,et al."Southeastward extrusion of the Tibetan Plateau limited by the strong Emeishan large igneous province from earthquake surface wave tomography".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 348(2024).