Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton
The Antarctic plate occupies a unique geodynamic setting being mostly surrounded by divergent or transform margins. Major intracontinental basins and highlands characterize its bedrock, buried under the 34Ma East Antarctic Ice Sheet (EAIS). Their formation atop of the cratonic lithosphere in the int...
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Online Access: | http://hdl.handle.net/11567/988332 https://doi.org/10.1016/j.tecto.2015.12.011 |
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ftunivgenova:oai:iris.unige.it:11567/988332 2024-04-14T08:04:03+00:00 Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton CIANFARRA, Paola SALVINI, Francesco Cianfarra, Paola Salvini, Francesco 2016 ELETTRONICO http://hdl.handle.net/11567/988332 https://doi.org/10.1016/j.tecto.2015.12.011 eng eng Elsevier info:eu-repo/semantics/altIdentifier/wos/WOS:000371374700003 volume:670 firstpage:30 lastpage:37 numberofpages:8 journal:TECTONOPHYSICS http://hdl.handle.net/11567/988332 doi:10.1016/j.tecto.2015.12.011 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84958124518 info:eu-repo/semantics/closedAccess Adventure Subglacial Trench East Antarctica intracratonic deformation strike-slip corridor Cenozoic tectonics info:eu-repo/semantics/article 2016 ftunivgenova https://doi.org/10.1016/j.tecto.2015.12.011 2024-03-21T02:31:55Z The Antarctic plate occupies a unique geodynamic setting being mostly surrounded by divergent or transform margins. Major intracontinental basins and highlands characterize its bedrock, buried under the 34Ma East Antarctic Ice Sheet (EAIS). Their formation atop of the cratonic lithosphere in the interior of East Antarctica remains a major open question. Post-Mesozoic intraplate extensional tectonic activity has been proposed for their development and is supported by this work. Here we focus on the Adventure Subglacial Trench (AST) whose origin is poorly constrained and controversial, as currently available geophysical models suggest either extensional or compressional tectonic origin. The AST is an over 250-km-long, 60-km-wide subglacial trough, elongated in the NNW-SSE direction adjacent to the westernmost flank of the Wilkes Subglacial Basin, and is parallel to regional scale alignments of magnetic and gravimetric anomalies. Geophysical campaigns allowed better definition of the AST physiography showing its typical half-graben geometry. The rounded morphology of the western flank of the AST was simulated through tectonic numerical modelling. We consider the subglacial landscape to primarily reflect a preserved relict of the tectonic processes affecting the interior of East Antarctica in the Cenozoic, due to the negligible erosion/deposition capability of the EAIS. The bedrock morphology was replicated through the activity of the listric Adventure Fault, characterized by a basal detachment at the base of the crust (34km) and a vertical displacement of 2.5km. This length suggests its regional/crustal importance. The predicted displacement is interpreted either as a newly formed fault or as the partial reactivation of a weaker zone along a major Precambrian crustal-scale tectonic boundary. The extensional regime in the AST is part of a more extensive 800-km long intraplate corridor characterized by nearly along-strike extension in Cenozoic times with a left-lateral transpressional component. This corridor may ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Università degli Studi di Genova: CINECA IRIS Adventure Subglacial Trench ENVELOPE(132.000,132.000,-74.000,-74.000) Antarctic East Antarctic Ice Sheet East Antarctica The Antarctic Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Tectonophysics 670 30 37 |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
topic |
Adventure Subglacial Trench East Antarctica intracratonic deformation strike-slip corridor Cenozoic tectonics |
spellingShingle |
Adventure Subglacial Trench East Antarctica intracratonic deformation strike-slip corridor Cenozoic tectonics CIANFARRA, Paola SALVINI, Francesco Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton |
topic_facet |
Adventure Subglacial Trench East Antarctica intracratonic deformation strike-slip corridor Cenozoic tectonics |
description |
The Antarctic plate occupies a unique geodynamic setting being mostly surrounded by divergent or transform margins. Major intracontinental basins and highlands characterize its bedrock, buried under the 34Ma East Antarctic Ice Sheet (EAIS). Their formation atop of the cratonic lithosphere in the interior of East Antarctica remains a major open question. Post-Mesozoic intraplate extensional tectonic activity has been proposed for their development and is supported by this work. Here we focus on the Adventure Subglacial Trench (AST) whose origin is poorly constrained and controversial, as currently available geophysical models suggest either extensional or compressional tectonic origin. The AST is an over 250-km-long, 60-km-wide subglacial trough, elongated in the NNW-SSE direction adjacent to the westernmost flank of the Wilkes Subglacial Basin, and is parallel to regional scale alignments of magnetic and gravimetric anomalies. Geophysical campaigns allowed better definition of the AST physiography showing its typical half-graben geometry. The rounded morphology of the western flank of the AST was simulated through tectonic numerical modelling. We consider the subglacial landscape to primarily reflect a preserved relict of the tectonic processes affecting the interior of East Antarctica in the Cenozoic, due to the negligible erosion/deposition capability of the EAIS. The bedrock morphology was replicated through the activity of the listric Adventure Fault, characterized by a basal detachment at the base of the crust (34km) and a vertical displacement of 2.5km. This length suggests its regional/crustal importance. The predicted displacement is interpreted either as a newly formed fault or as the partial reactivation of a weaker zone along a major Precambrian crustal-scale tectonic boundary. The extensional regime in the AST is part of a more extensive 800-km long intraplate corridor characterized by nearly along-strike extension in Cenozoic times with a left-lateral transpressional component. This corridor may ... |
author2 |
Cianfarra, Paola Salvini, Francesco |
format |
Article in Journal/Newspaper |
author |
CIANFARRA, Paola SALVINI, Francesco |
author_facet |
CIANFARRA, Paola SALVINI, Francesco |
author_sort |
CIANFARRA, Paola |
title |
Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton |
title_short |
Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton |
title_full |
Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton |
title_fullStr |
Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton |
title_full_unstemmed |
Origin of the Adventure Subglacial Trench linked to Cenozoic extension in the East Antarctic Craton |
title_sort |
origin of the adventure subglacial trench linked to cenozoic extension in the east antarctic craton |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://hdl.handle.net/11567/988332 https://doi.org/10.1016/j.tecto.2015.12.011 |
long_lat |
ENVELOPE(132.000,132.000,-74.000,-74.000) ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Adventure Subglacial Trench Antarctic East Antarctic Ice Sheet East Antarctica The Antarctic Wilkes Subglacial Basin |
geographic_facet |
Adventure Subglacial Trench Antarctic East Antarctic Ice Sheet East Antarctica The Antarctic Wilkes Subglacial Basin |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000371374700003 volume:670 firstpage:30 lastpage:37 numberofpages:8 journal:TECTONOPHYSICS http://hdl.handle.net/11567/988332 doi:10.1016/j.tecto.2015.12.011 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84958124518 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.tecto.2015.12.011 |
container_title |
Tectonophysics |
container_volume |
670 |
container_start_page |
30 |
op_container_end_page |
37 |
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1796300412362424320 |