Joint Inversion for Lithospheric Structures: Implications for the Growth and Deformation in Northeastern Tibetan Plateau

Yangfan Deng, Jiangtao Li, Xiaodong Song, Lupei Zhu

Research output: Contribution to journalArticle

Abstract

Several geodynamic models have been proposed for the deformation mechanism of Tibetan Plateau (TP), but it remains controversial. Here we applied a method of joint inversion of receiver functions and surface wave dispersions with P wave velocity constraint to a dense linear array in the NE Tibet. The results show that the geological blocks, separated by major faults at the surface, are characterized by distinct features in the crust, the Moho, and the uppermost mantle. The main features include crustal low-velocity zones (LVZs) with variable strengths, anomalous Vp/Vs ratios that are correlated with LVZs, a large Moho jump, and other abrupt changes near major faults, strong mantle lithosphere anomalies, and correlation of crustal and mantle velocities. The results suggest a lithospheric-scale deformation of continuous shortening as well as localized faulting, which is affected by the strength of the lithosphere blocks. The thickened mantle lithosphere can be removed, which facilitates the formation of middle-lower crustal LVZ and flow. However, such flow is likely a consequence of the deformation rather than a driving force for the outward growth of the TP. The proposed model of TP deformation and growth can reconcile the continuous deformation within the blocks and major faults at the surface.

Original languageEnglish (US)
Pages (from-to)3951-3958
Number of pages8
JournalGeophysical Research Letters
Volume45
Issue number9
DOIs
StatePublished - May 16 2018

Keywords

  • Tibetan Plateau
  • crustal flow
  • deformation and growth
  • delamination
  • joint inversion

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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