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Electrical structure across a major ice-covered fault belt in northern Victoria Land (East Antarctica)

Armadillo, E.; Ferraccioli, F.; Tabellario, G.; Bozzo, E.. 2004 Electrical structure across a major ice-covered fault belt in northern Victoria Land (East Antarctica). Geophysical Research Letters, 31 (10), L10615. 4, pp. 10.1029/2004GL019903

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Abstract/Summary

A Geomagnetic Depth Sounding profile was performed across the glaciated Rennick Graben and the adjacent fault-bounded terranes of northern Victoria Land in East Antarctica. Induction arrows analysis and a 2D inversion model provide a unique deep electrical resistivity window beneath these fault zones. The electrical resistivity break across the Lanterman Fault is apparently restricted to the upper crust, suggesting that this strike-slip fault may not represent a deep lithospheric suture. Further east, a westward-dipping conductor is traced to a depth of 40 km beneath the Robertson Bay Terrane. It may image a remnant of the paleo-Pacific oceanic plate, which subducted beneath the Bowers Terrane. Within the Wilson Terrane, the Rennick Graben is an upper-crust resistive block. The Rennick Graben lacks a deep crustal or upper mantle conductor, in contrast to several continental rifts. However, similar resistive lower crust underlies some other major strike-slip fault belts.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2004GL019903
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Antarctica in the Dynamic Global Plate System
ISSN: 0094-8276
NORA Subject Terms: Glaciology
Earth Sciences
Date made live: 19 May 2011 14:48
URI: http://nora.nerc.ac.uk/id/eprint/12096

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