从高分辨率地震层析成像看青藏高原软流圈的物质运动

杨文采; 刘晓宇; 陈召曦; 江金生

doi:10.3799/dqkx.2022.871

Volume 47 Issue 10

Oct. 2022

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Article Navigation > Earth Science > 2022 > 47(10): 3491-3500

Yang Wencai, Liu Xiaoyu, Chen Zhaoxi, Jiang Jinsheng, 2022. Asthenosphere Mass Movement in Qinghai-Tibetan Plateau Revealed by High-Resolution Seismic Tomography. Earth Science, 47(10): 3491-3500. doi: 10.3799/dqkx.2022.871

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Yang Wencai, Liu Xiaoyu, Chen Zhaoxi, Jiang Jinsheng, 2022. Asthenosphere Mass Movement in Qinghai-Tibetan Plateau Revealed by High-Resolution Seismic Tomography. Earth Science, 47(10): 3491-3500. doi: 10.3799/dqkx.2022.871

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Asthenosphere Mass Movement in Qinghai-Tibetan Plateau Revealed by High-Resolution Seismic Tomography

doi: 10.3799/dqkx.2022.871

1.
School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.
School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China

Received Date: 2022-06-14
Publish Date: 2022-10-25

Abstract

Abstract

Through the three-dimensional seismic imaging of the upper mantle of the Qinghai-Tibet Plateau with a resolution of 0.5°×0.5°×10 km, it provides a new understanding for the study of the dynamic evolution of the plateau in the Cenozoic Era. The asthenosphere P-wave velocity disturbance data confirm that the Tethys Oceanic Plate only subducted to the 410 km discontinuity after its delamination, proving that not all oceanic plates were subducting to the bottom of the upper mantle. The upwelling of the thermal fluid, excited by this oceanic plate delamination in the asthenosphere and the rupture process of the continental lithosphere, caused a large-scale volcanic eruption in the middle of the plateau, which is one of the main sources of power for the uplift of the Qinghai-Tibet Plateau. According to the results of three-dimensional seismic tomography of the upper mantle, the depth of the lithosphere-asthenosphere boundary (LAB) was quantitatively calculated, revealing the upwelling locations of asthenosphere material and the sinking of lithosphere mass, indicating that the eastern part of the Qinghai-Tibet Plateau is a relatively independent continental lithosphere-mantle block in the regional dynamic process of Cenozoic dynamics.
- continental dynamics,
- Qinghai-Tibetan Plateau,
- asthenosphere,
- seismic tomography,
- LAB high-resolution,
- geophysics

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References(59)

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Asthenosphere Mass Movement in Qinghai-Tibetan Plateau Revealed by High-Resolution Seismic Tomography

doi: 10.3799/dqkx.2022.871

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