Skip to Main content Skip to Navigation
Journal articles

Seismic Structure Beneath the Tibetan Plateau From Iterative Finite‐Frequency Tomography Based on ChinArray: New Insights Into the Indo‐Asian Collision

Abstract : Indo‐Asian continental collision has contributed to the growth of the Tibetan Plateau, which is one of the most prominent uplifts worldwide since Cenozoic. The crustal and upper‐mantle structures are key factors in understanding the evolutionary process as well as lateral growth of the plateau. We present a new 3‐D seismic model beneath the Tibetan Plateau and its surrounding areas, which uses a large‐scale dense array from iterative finite‐frequency tomography. The new tomographic images show obvious east‐west geometrical change of the northward Indian lithosphere by high‐velocity anomalies beneath Tibet. The high‐velocity anomaly extends to Pamir in the western side, but it only reaches north Lhasa in central and eastern Tibet. A convective removal of the thickened Tibetan lithosphere is observed as a high‐velocity anomaly, followed by a subvertical subduction of the Indian mantle lithosphere beneath the Bangong‐Nujiang Suture in central Tibet. We speculate its link to the widespread magmatism and rapid uplift of central Tibet in late Miocene. A high‐velocity gap between 100 and 250 km underneath the Longmenshan fault indicates that lithospheric delamination may play an important role in surface evolution between eastern Tibet and surrounding rigid blocks. Our detailed seismological model will give an insight into how the continents collide.
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-02521351
Contributor : Eva Fareau <>
Submitted on : Friday, March 27, 2020 - 1:02:24 PM
Last modification on : Sunday, March 29, 2020 - 1:40:49 AM

Identifiers

Collections

INSU | CNRS | IPGP | USPC

Citation

Zhuo Xiao, Nobuaki Fuji, Takashi Iidaka, Yuan Gao, Xinlei Sun, et al.. Seismic Structure Beneath the Tibetan Plateau From Iterative Finite‐Frequency Tomography Based on ChinArray: New Insights Into the Indo‐Asian Collision. Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2020, 125 (2), ⟨10.1029/2019JB018344⟩. ⟨insu-02521351⟩

Share

Metrics

Record views

226