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    Restricted lithospheric extrusion in the SE Tibetan Plateau: evidence from anisotropic Rayleigh-wave tomography

    Han, C. and Huang, Z. and Hao, S. and Wang, L. and Xu, M. and Hammond, James O.S. (2022) Restricted lithospheric extrusion in the SE Tibetan Plateau: evidence from anisotropic Rayleigh-wave tomography. Earth and Planetary Science Letters 598 , p. 117837. ISSN 0012-821X.

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    Constraining variations of lithospheric structure and deformation across southeastern Tibet and the surrounding region are crucial for understanding the lateral growth of the plateau. Using data from two dense seismic arrays in the SE Tibetan Plateau, we obtained fine-scale Rayleigh-wave phase velocity maps by Eikonal tomography, and further inverted for 3-D shear wave velocity and azimuthal anisotropy of the crust and upper mantle. High velocities and weak lithospheric anisotropy are revealed under Dianzhong Block (DZB), where is covered by the relics of the Emeishan Large Igneous Province, while strong anisotropy is imaged around. We propose that the DZB strengthened by the paleo igneous activity plays an essential role in the evolution along the southeastern plateau margin. On the one hand, the DZB obstructs the migration of plateau material to the southeast. On the other hand, strong deformation is localized along the DZB margins, while the stress due to the plate expansion is transferred further to the Xiaojiang fault, which induced significant deformation within the Yangtze Craton. Furthermore, the lithosphere of DZB deflects the mantle flow driven by the eastward Indian subduction under the northern Indochina block.


    Item Type: Article
    Keyword(s) / Subject(s): Tibetan Plateau, Emeishan LIP, seismic anisotropy, restricted lithospheric extrusion, deflected mantle flow
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: James Hammond
    Date Deposited: 13 Oct 2022 14:30
    Last Modified: 02 Aug 2023 18:18


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