Rayleigh-wave dispersion reveals crust-mantle decoupling beneath eastern Tibet

被引:37
|
作者
Legendre, Cedric P. [1 ]
Deschamps, Frederic [1 ]
Zhao, Li [1 ]
Chen, Qi-Fu [2 ]
机构
[1] Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
[2] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
来源
SCIENTIFIC REPORTS | 2015年 / 5卷
关键词
SEISMIC ANISOTROPY; AZIMUTHAL ANISOTROPY; VELOCITY STRUCTURE; PHASE VELOCITIES; SOUTHEAST-ASIA; DEFORMATION; PLATEAU; SHEAR; FLOW; CHINA;
D O I
10.1038/srep16644
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The Tibetan Plateau results from the collision of the Indian and Eurasian Plates during the Cenozoic, which produced at least 2,000 km of convergence. Its tectonics is dominated by an eastward extrusion of crustal material that has been explained by models implying either a mechanical decoupling between the crust and the lithosphere, or lithospheric deformation. Discriminating between these end-member models requires constraints on crustal and lithospheric mantle deformations. Distribution of seismic anisotropy may be inferred from the mapping of azimuthal anisotropy of surface waves. Here, we use data from the CNSN to map Rayleigh-wave azimuthal anisotropy in the crust and lithospheric mantle beneath eastern Tibet. Beneath Tibet, the anisotropic patterns at periods sampling the crust support an eastward flow up to 100 degrees E in longitude, and a southward bend between 100 degrees E and 104 degrees E. At longer periods, sampling the lithospheric mantle, the anisotropic structures are consistent with the absolute plate motion. By contrast, in the Sino-Korean and Yangtze cratons, the direction of fast propagation remains unchanged throughout the period range sampling the crust and lithospheric mantle. These observations suggest that the crust and lithospheric mantle are mechanically decoupled beneath eastern Tibet, and coupled beneath the Sino-Korean and Yangtze cratons.
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页数:7
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