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Electrical structure across a major ice‐covered fault belt in Northern Victoria Land (East Antarctica)
Author(s) -
Armadillo E.,
Ferraccioli F.,
Tabellario G.,
Bozzo E.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl019903
Subject(s) - geology , terrane , crust , seismology , graben , fault (geology) , strike slip tectonics , subduction , fibrous joint , geophysics , tectonics , medicine , anatomy
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.