期刊
TECTONOPHYSICS
卷 835, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.tecto.2022.229376
关键词
Mongolian Plateau; SKS splitting; Seismic anisotropy; Hangai Dome; Mantle upwelling
资金
- National Natural Science Foundations of China [42174056]
- Deng-Feng Scholar Program of Nanjing University
By measuring SKS splitting, this study reveals the complex deformation of the upper mantle in western Mongolia. The predominant NW-SE-oriented fast polarization directions are consistent with lithospheric deformation and asthenospheric flow. The shape of the Siberian Craton influences the extent of lithospheric deformation and causes the deflection of asthenospheric flow.
The Mongolian Plateau, as an important geological unit of the Central Asian Orogenic Belt, has experienced extensive deformations in multiple periods since the Proterozoic. In this study, we measured SKS splitting from 114 portable stations to reveal the complicated deformation of the upper mantle under western Mongolia. The predominant NW-SE-oriented fast polarization directions (FPDs) are consistent with lithospheric deformation and asthenospheric flow to the first order. However, the FPDs of the stations close to the Siberian Craton are more parallel to the cratonic margin than those departing from the craton. It indicates that the shape of the rigid Siberian Craton may determine the extent of the present lithospheric deformation and cause the deflection of the asthenospheric flow. Large SKS splitting delay times are distributed in the Hovsgol rift and Gobi-Altai range, implying superimposed past and present lithospheric anisotropy, and the asthenospheric anisotropy as well under the Hovsgol rift. Small delay times in the Hangai Dome indicate the asthenospheric upwelling which causes the uplift of the dome.
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