Upper Mantle Deformation of the Terror Rift and Northern Transantarctic Mountains in Antarctica: Insight From P Wave Anisotropic Tomography

Heng Zhang, Dapeng Zhao, Changhui Ju, Yunyue Elita Li, Guohui Li, Min Ding, Shuze Chen, Junmeng Zhao

Research output: Contribution to journalArticlepeer-review

Abstract

A large number of teleseismic traveltime data are used to determine the first P-wave radial anisotropy tomography beneath the Terror Rift, the northern Transantarctic Mountains (NTAM) and the Wilkes Subglacial Basin in Antarctica. Our results show that variations of radial anisotropy occur in both horizontal and vertical directions. In the NTAM, a high-velocity zone with positive radial anisotropy is revealed at shallower depths, which reflects the lithospheric deformation pattern formed during the Ross Orogeny. In contrast, negative radial anisotropy appears at depths >200 km under the NTAM, which is caused by the characterization of olivine fabric rather than foundering lithosphere. Beneath the western Wilkes Subglacial Basin, a two-layer lithosphere exists that contains rift-induced cracks. To the east of the NTAM, asthenospheric upwelling occurs at shallow depths beneath the Terror Rift. Then the upwelling asthenosphere flows northward to Mount Melbourne and southward to Mount Erebus.

Original languageEnglish
Article numbere2019GL086511
JournalGeophysical Research Letters
Volume47
Issue number9
DOIs
Publication statusPublished - 2020 May 16

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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