Lithospheric structure and crust–mantle decoupling in the southeast edge of the Tibetan Plateau

2012 ◽  
Vol 22 (3-4) ◽  
pp. 1060-1067 ◽  
Author(s):  
Jiafu Hu ◽  
Haiyan Yang ◽  
Xingqian Xu ◽  
Limin Wen ◽  
Guangquan Li
Keyword(s):  
Tibetan Plateau ◽  
Lithospheric Structure ◽  
The Tibetan Plateau

Adjoint Tomography of the Lithospheric Structure beneath Northeastern Tibet

2020 ◽  
Vol 91 (6) ◽  
pp. 3304-3312
Author(s):  
Xingpeng Dong ◽  
Dinghui Yang ◽  
Hejun Zhu
Keyword(s):  
Tibetan Plateau ◽  
Indian Plate ◽  
Tectonic Deformation ◽  
Lithospheric Structure ◽  
The Tibetan Plateau ◽  
S Wave ◽  
Low Velocity ◽  
Northeastern Tibet ◽  
Adjoint Tomography ◽  
Indian Lithosphere

Abstract Northeastern Tibet is still in the primary stage of tectonic deformation and is the key area for studying the lateral expansion of the Tibetan plateau. In particular, the existence of lower crustal flow, southward subduction of the Asian lithosphere, and northward subduction of the Indian lithosphere beneath northeastern Tibet remains controversial. To provide insights into these issues, a high-resolution 3D radially anisotropic model of the lithospheric structure of northeastern Tibet is developed based on adjoint tomography. The Tibetan plateau is characterized as a low S-wave velocity lithosphere, in contrast with the relatively high S-wave velocities of the stable Asian blocks. Our tomographic result indicates that the low-velocity zone (LVZ) within the deep crust extends northeastward from Songpan–Ganzi to Qilian, which is interpreted as a channel flow within the crust. The upper mantle of Alxa and Qinling–Qilian are dominated by a rather homogeneous LVZ, which is inconsistent with the hypothesis that the Asian lithospheric mantle is being subducted southward beneath northeastern Tibet. Furthermore, high-velocity regions are observed in the southern Songpan–Ganzi region at depths ranging from 100 to 200 km, indicating that the northward-subducting Indian plate has probably reached the Xianshuihe fault.

Lithospheric structure and evolution of the Tibetan Plateau: the Yadong-Golmud geoscience transect

1993 ◽  
Vol 219 (1-3) ◽  
pp. 213-221 ◽  
Author(s):  
Gongjing Wu ◽  
Xuchang Xiao ◽  
Tingdon Li ◽  
Qingyun Cheng ◽  
Junwen Cui ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Lithospheric Structure ◽  
The Tibetan Plateau
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