气候变化领域集成服务门户(CCPortal): Lateral Seismic Anisotropy Variations Record Interaction Between Tibetan Mantle Flow and Plume-Strengthened Yangtze Craton

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DOI	10.1029/2020JB020841
	Lateral Seismic Anisotropy Variations Record Interaction Between Tibetan Mantle Flow and Plume-Strengthened Yangtze Craton
	Li W.; Chen Y.; Liang X.; Xu Y.-G.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The southeastern Tibetan Plateau experienced intense Cenozoic shortening and extrusion along the western Yangtze Craton, SW China, where the Permian Emeishan flood basalts were emplaced. Seismic anisotropy along a dense E–W-trending linear seismic array across the west Yunnan is determined by shear-wave splitting analysis to characterize the deformation associated with these processes. Interestingly, a strong N–S-oriented anisotropic zone collocated with the Eocene–Oligocene potassic magmatism is observed between two weak anisotropic zones in the Three-River Orogenic Zone and the western Yangtze Craton, respectively. The lateral anisotropy variation and distinct upper mantle structures collectively suggest that the western most Yangtze Craton, strengthened by the Permian mantle plume, acted as a rigid barrier to divert the Cenozoic Tibetan mantle flow into the Three-River Orogenic Zone. Consequently, the western edge of the Yangtze Craton has been partially eroded and its anisotropic orientation was realigned to the direction of the mantle flow. This observation indicates that both the remodeled anisotropy in the lithosphere and the dynamic flow in the asthenosphere contribute to the mantle anisotropy at the lateral lithosphere-asthenosphere transition, which is usually hard to seismologically resolve from the vertical lithosphere-asthenosphere boundary. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	ancient mantle plume; Emeishan Large Igneous Province; mantle flow; S wave velocity; seismic anisotropy; southeastern Tibet
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187237
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
推荐引用方式 GB/T 7714	Li W.,Chen Y.,Liang X.,et al. Lateral Seismic Anisotropy Variations Record Interaction Between Tibetan Mantle Flow and Plume-Strengthened Yangtze Craton[J],2021,126(4).
APA	Li W.,Chen Y.,Liang X.,&Xu Y.-G..(2021).Lateral Seismic Anisotropy Variations Record Interaction Between Tibetan Mantle Flow and Plume-Strengthened Yangtze Craton.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Li W.,et al."Lateral Seismic Anisotropy Variations Record Interaction Between Tibetan Mantle Flow and Plume-Strengthened Yangtze Craton".Journal of Geophysical Research: Solid Earth 126.4(2021).