Seismic anisotropy and mantle dynamics beneath Maitri Station in central Dronning Maud Land, East Antarctica: new insights from shear wave splitting analysis of core-refracted and direct S-phases

K.  Sivaram; V. Pavan Kumar; D. Srinivas

doi:10.33265/polar.v44.11414

K. Sivaram National Geophysical Research Institute, Council of Scientific & Industrial Research, Hyderabad, India; and The Academy of Scientific & Innovative Research, Ghaziabad, India https://orcid.org/0000-0002-6468-6764
V. Pavan Kumar National Geophysical Research Institute, Council of Scientific & Industrial Research, Hyderabad, India; and The Academy of Scientific & Innovative Research, Ghaziabad, India https://orcid.org/0000-0002-3719-7367
D. Srinivas National Geophysical Research Institute, Council of Scientific & Industrial Research, Hyderabad, India https://orcid.org/0000-0002-8762-6211

DOI: https://doi.org/10.33265/polar.v44.11414

Keywords: Gondwana, supercontinent, shear waves, mantle anisotropy, olivine, Schirmacher Oasis

Abstract

To elucidate the Gondwana supercontinent, we investigate mantle dynamics in Dronning Maud Land, Antarctica, using shear wave splitting analysis. This involves 12 S-phase teleseismic events and 38 core refracted phase (SKS, SKKS, PKKS and PKS) events, hereafter collectively referred to as XKS, recorded in the period 2013–17 (excluding noisy periods), at the broadband seismic station at Maitri, the Indian research station. The splitting parameters Φ (fast polarization direction) and δt (delay time) were estimated by cluster analysis and minimization of eigenvalues from covariance matrix of Φ and δt. Our XKS analysis, assuming a single layer of anisotropy, shows an average Φ of 62° and δt of 1.1 sec. The S-wave analysis shows an average Φ of 50° and δt of 0.97 sec. The Φ values of the fast XKS and S-wave phases, having a north-east–south-west direction, are sub-parallel to the geological boundary of Schirmacher Oasis and the continental margin of East Antarctica. The observed margin-parallel XKS and seismic anisotropy at Maitri, which are also aligned to magnetic anomalies, correlate well with frozen lithospheric anisotropy, due to the major tectonic events, lineations and/or transtensional rifting at the breakup of Gondwana.

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