Imaging the Northeastern Crustal Boundary of the Tibetan Plateau With Radial Anisotropy

Shilin Li1,2; Zhen Guo1,2,3; Yong Yu1,2; Xiaoyang Wu1,2; Yongshun John Chen1,2,3

2022-12-16

10.1029/2022GL100672

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

We obtained a 3-D crustal radial anisotropy model beneath northeastern (NE) Tibet by joint inversion of Rayleigh and Love dispersion curves from ambient noise tomography. Positive crustal radial anisotropy and significant low velocity are dominant beneath the Songpan-Ganzi Terrane (SGT), indicating the presence of crustal channel flow. The Qilian orogen is characterized by negative radial anisotropy, which could be caused by folding and thrusting due to crustal shortening. This difference in radial anisotropy suggests that crustal shortening deformation may have occurred at a relatively early stage of the plateau evolution (the Qilian orogen) and crustal channel flow at the later stage (the SGT). The crustal radial anisotropy clearly defines the NE crustal boundary of the expanding Tibetan Plateau, which is roughly situated along the north Qilian frontal thrust from 97 & DEG; to 103.5 & DEG;E in the north and turns north-south, passing the Zhuanglanghe Fault and terminating at the Kunlun Fault in the south.

SCI

English

NI Journal Papers

First ; Corresponding

null[41904056] ; null[41974052] ; null[41890814] ; null[42122027] ; null[U1901602]

Geology

Geosciences, Multidisciplinary

WOS:000928052000057

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China,
2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Shenzhen, China,
3.Shanghai Sheshan National Geophysical Observatory and Research Station, Shanghai, China

Shilin Li,Zhen Guo,Yong Yu,et al. Imaging the Northeastern Crustal Boundary of the Tibetan Plateau With Radial Anisotropy[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(23).

Shilin Li,Zhen Guo,Yong Yu,Xiaoyang Wu,&Yongshun John Chen.(2022).Imaging the Northeastern Crustal Boundary of the Tibetan Plateau With Radial Anisotropy.GEOPHYSICAL RESEARCH LETTERS,49(23).

Shilin Li,et al."Imaging the Northeastern Crustal Boundary of the Tibetan Plateau With Radial Anisotropy".GEOPHYSICAL RESEARCH LETTERS 49.23(2022).