ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA
Magnetovariational (MV) and magnetotelluric (MT) surveys are useful tools to understand both the structure and evolution of the Antarctic lithosphere over regionally extensive areas. This is particularly the case over the interior of East Antarctica, the most poorly understood part of our planet and...
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ftunivgenova:oai:iris.unige.it:11567/241467 2024-02-11T09:56:22+01:00 ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA BOZZO, EMANUELE ARMADILLO, EGIDIO M. GAMBETTA Bozzo, Emanuele Armadillo, Egidio M., Gambetta 2009 ELETTRONICO http://hdl.handle.net/11567/241467 eng eng ispartofbook:ABSTRACT BOOK of the IAGA 11th Scientific Assembly IAGA 11th SCIENTIFIC ASSEMBLY firstpage:1 lastpage:1 http://hdl.handle.net/11567/241467 info:eu-repo/semantics/conferenceObject 2009 ftunivgenova 2024-01-17T17:35:39Z Magnetovariational (MV) and magnetotelluric (MT) surveys are useful tools to understand both the structure and evolution of the Antarctic lithosphere over regionally extensive areas. This is particularly the case over the interior of East Antarctica, the most poorly understood part of our planet and a major frontier for future exploration. However, the application of these techniques is still in its infancy in Antarctica compared to the other continents. This is in part due to the polar electrojet current system which can cause source fields that may violate the uniform plane wave assumption underlying standard MV and MT data processing. Since year 2000, we initiated a phase of systematic deep electrical conductivity studies over Northern Victoria Land, in East Antarctica. Among the first results achieved, the most outstanding evidence, revealed by MV probing, is a wide electromagnetic anomaly under the Deep Freeze Range crustal block. Following this experience a larger number of MV stations were deployed over the Transantarctic Mountains and the enigmatic Wilkes Subglacial Basin. The BACKTAM array across the Cenozoic Rennick Graben and the Early Paleozoic terrane boundaries of northern Victoria Land provides an example of the potential of the MV technique in the detection of major glaciated fault zones. Here we show a new set of 2D deep electrical conductivity images across the Rennick Graben and the eastern faulted margin of the Wilkes Subglacial Basin. Induction arrows analysis and a 2D inversion models 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 ... Conference Object Antarc* Antarctic Antarctica East Antarctica Victoria Land Università degli Studi di Genova: CINECA IRIS Antarctic The Antarctic East Antarctica Victoria Land Transantarctic Mountains Pacific Bowers ENVELOPE(164.083,164.083,-85.000,-85.000) Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Rennick ENVELOPE(161.500,161.500,-72.000,-72.000) Robertson Bay ENVELOPE(170.000,170.000,-71.417,-71.417) Deep Freeze Range ENVELOPE(163.750,163.750,-74.250,-74.250) |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
description |
Magnetovariational (MV) and magnetotelluric (MT) surveys are useful tools to understand both the structure and evolution of the Antarctic lithosphere over regionally extensive areas. This is particularly the case over the interior of East Antarctica, the most poorly understood part of our planet and a major frontier for future exploration. However, the application of these techniques is still in its infancy in Antarctica compared to the other continents. This is in part due to the polar electrojet current system which can cause source fields that may violate the uniform plane wave assumption underlying standard MV and MT data processing. Since year 2000, we initiated a phase of systematic deep electrical conductivity studies over Northern Victoria Land, in East Antarctica. Among the first results achieved, the most outstanding evidence, revealed by MV probing, is a wide electromagnetic anomaly under the Deep Freeze Range crustal block. Following this experience a larger number of MV stations were deployed over the Transantarctic Mountains and the enigmatic Wilkes Subglacial Basin. The BACKTAM array across the Cenozoic Rennick Graben and the Early Paleozoic terrane boundaries of northern Victoria Land provides an example of the potential of the MV technique in the detection of major glaciated fault zones. Here we show a new set of 2D deep electrical conductivity images across the Rennick Graben and the eastern faulted margin of the Wilkes Subglacial Basin. Induction arrows analysis and a 2D inversion models 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 ... |
author2 |
Bozzo, Emanuele Armadillo, Egidio M., Gambetta |
format |
Conference Object |
author |
BOZZO, EMANUELE ARMADILLO, EGIDIO M. GAMBETTA |
spellingShingle |
BOZZO, EMANUELE ARMADILLO, EGIDIO M. GAMBETTA ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA |
author_facet |
BOZZO, EMANUELE ARMADILLO, EGIDIO M. GAMBETTA |
author_sort |
BOZZO, EMANUELE |
title |
ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA |
title_short |
ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA |
title_full |
ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA |
title_fullStr |
ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA |
title_full_unstemmed |
ELECTRICAL CONDUCTIVITY IMAGING OF CRUSTAL STRUCTURES IN NORTHERN VICTORIA LAND, ANTARCTICA |
title_sort |
electrical conductivity imaging of crustal structures in northern victoria land, antarctica |
publishDate |
2009 |
url |
http://hdl.handle.net/11567/241467 |
long_lat |
ENVELOPE(164.083,164.083,-85.000,-85.000) ENVELOPE(145.000,145.000,-75.000,-75.000) ENVELOPE(161.500,161.500,-72.000,-72.000) ENVELOPE(170.000,170.000,-71.417,-71.417) ENVELOPE(163.750,163.750,-74.250,-74.250) |
geographic |
Antarctic The Antarctic East Antarctica Victoria Land Transantarctic Mountains Pacific Bowers Wilkes Subglacial Basin Rennick Robertson Bay Deep Freeze Range |
geographic_facet |
Antarctic The Antarctic East Antarctica Victoria Land Transantarctic Mountains Pacific Bowers Wilkes Subglacial Basin Rennick Robertson Bay Deep Freeze Range |
genre |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
op_relation |
ispartofbook:ABSTRACT BOOK of the IAGA 11th Scientific Assembly IAGA 11th SCIENTIFIC ASSEMBLY firstpage:1 lastpage:1 http://hdl.handle.net/11567/241467 |
_version_ |
1790602498961047552 |