Upper mantle tomography of the Western Junggar: Implications for its geodynamic evolution

Yuanyuan Hua, Yixian Xu, Dapeng Zhao, Rong Huang, Xiaohuan Jiang

Research output: Contribution to journalArticle

Abstract

A high-resolution 3-D P-wave velocity model of the upper mantle beneath the Western Junggar is determined by inverting a large number of relative travel-time residuals of teleseismic events. Our results reveal a prominent high-velocity (high-V) anomaly beneath the western Junggar basin and a low-velocity (low-V) anomaly beneath the Darbut belt. The NE-SW striking high-V anomaly at depths of 50–200 km beneath the western Junggar basin dips toward the northwest, which represents a fossil oceanic slab. The low-V anomaly may reflect an intraoceanic arc-related terrain that has experienced strong metasomatism by hot upwelling asthenosphere in the late Paleozoic, resulting in adakitic intrusions and concentration of porphyry Cu[sbnd]Au deposits in the Darbut belt. These results shed new light on the geodynamic evolution of the Western Junggar and formation mechanisms of the adakites and porphyry Cu[sbnd]Au deposits.

Original languageEnglish
Article number106405
JournalPhysics of the Earth and Planetary Interiors
Volume299
DOIs
Publication statusPublished - 2020 Feb

Keywords

  • Darbut belt
  • Seismic velocity
  • Teleseismic tomography
  • Upper mantle
  • Western Junggar

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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