Geophysical imaging unveils the largest pull-apart basin in East Antarctica
West Antarctica hosts one of the largest continental rift systems on Earth, the West Antarctic Rift System (WARS) that forms the lithospheric cradle for the West Antarctic Ice Sheet. The WARS is known to have experienced several stages of extension starting with distributed/wide mode extension in th...
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ftunivgenova:oai:iris.unige.it:11567/1024194 2024-04-14T08:04:15+00:00 Geophysical imaging unveils the largest pull-apart basin in East Antarctica Egidio Armadillo Fausto Ferraccioli Laura Crispini Andreas Läufer Alessandro Ghirotto Antonia Stefanie Ruppel Armadillo, Egidio Ferraccioli, Fausto Crispini, Laura Läufer, Andrea Ghirotto, Alessandro Stefanie Ruppel, Antonia 2019 ELETTRONICO http://hdl.handle.net/11567/1024194 eng eng ispartofbook:AGU 2019 abstracts American Geophysical Union, Fall Meeting 2019 firstpage:T33F-0421-1 lastpage:T33F-0421-1 numberofpages:1 http://hdl.handle.net/11567/1024194 info:eu-repo/semantics/openAccess info:eu-repo/semantics/conferenceObject 2019 ftunivgenova 2024-03-21T02:33:45Z West Antarctica hosts one of the largest continental rift systems on Earth, the West Antarctic Rift System (WARS) that forms the lithospheric cradle for the West Antarctic Ice Sheet. The WARS is known to have experienced several stages of extension starting with distributed/wide mode extension in the Cretaceous, followed by narrower mode and variably oblique extension in the Cenozoic, the latter potentially triggered by the onset of oceanic seafloor spreading in the Adare Basin (Davey et al., 2016, GRL). However, the extent and impact of Cenozoic extension and transtension within the Transantarctic Mountains sector of East Antarctica is much less well understood. Here we present results from a new project (REGGAE) that by analysing aeromagnetic, aerogravity and land-gravity and bedrock topography images and models provides key new geophysical constraints on the form, extent and kinematics of the largest Cenozoic pull-apart basin recognised so far in East Antarctica, the Rennick Graben (RG). Potential field imaging reveals the extent of part of a Jurassic tholeiitic Large Igneous Province preserved within the RG and helps delineate the inherited structural architecture of the underlying Ross-age basement in northern Victoria Land, including highly magnetic arc basement in the northern Wilson Terrane and the subglacial extent of a thrust fault belt located between the western flank of the RG and the eastern margin of Wilkes Subglacial Basin (WSB). We show that the RG is a major composite right-lateral pull-part basin that extends from the Oates Coast to the Southern Cross Mountains crustal block and propose that it is kinematically connected with both the western edge of the WARS and the eastern margin of the WSB. More cryptic evidence for an earlier phase of left-lateral strike slip deformation is also emerging from our recent geological field work in the study region and relatively subtle offsets in aeromagnetic anomaly patterns. Our findings suggest that the RG is part of a distributed region of the continental ... Conference Object Antarc* Antarctic Antarctica East Antarctica Ice Sheet Victoria Land West Antarctica Università degli Studi di Genova: CINECA IRIS Antarctic East Antarctica West Antarctica Victoria Land West Antarctic Ice Sheet Transantarctic Mountains Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Rennick ENVELOPE(161.500,161.500,-72.000,-72.000) Davey ENVELOPE(-58.567,-58.567,-61.967,-61.967) Oates Coast ENVELOPE(158.000,158.000,-70.000,-70.000) Adare Basin ENVELOPE(175.000,175.000,-71.000,-71.000) Southern Cross Mountains ENVELOPE(164.000,164.000,-73.667,-73.667) |
institution |
Open Polar |
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Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
description |
West Antarctica hosts one of the largest continental rift systems on Earth, the West Antarctic Rift System (WARS) that forms the lithospheric cradle for the West Antarctic Ice Sheet. The WARS is known to have experienced several stages of extension starting with distributed/wide mode extension in the Cretaceous, followed by narrower mode and variably oblique extension in the Cenozoic, the latter potentially triggered by the onset of oceanic seafloor spreading in the Adare Basin (Davey et al., 2016, GRL). However, the extent and impact of Cenozoic extension and transtension within the Transantarctic Mountains sector of East Antarctica is much less well understood. Here we present results from a new project (REGGAE) that by analysing aeromagnetic, aerogravity and land-gravity and bedrock topography images and models provides key new geophysical constraints on the form, extent and kinematics of the largest Cenozoic pull-apart basin recognised so far in East Antarctica, the Rennick Graben (RG). Potential field imaging reveals the extent of part of a Jurassic tholeiitic Large Igneous Province preserved within the RG and helps delineate the inherited structural architecture of the underlying Ross-age basement in northern Victoria Land, including highly magnetic arc basement in the northern Wilson Terrane and the subglacial extent of a thrust fault belt located between the western flank of the RG and the eastern margin of Wilkes Subglacial Basin (WSB). We show that the RG is a major composite right-lateral pull-part basin that extends from the Oates Coast to the Southern Cross Mountains crustal block and propose that it is kinematically connected with both the western edge of the WARS and the eastern margin of the WSB. More cryptic evidence for an earlier phase of left-lateral strike slip deformation is also emerging from our recent geological field work in the study region and relatively subtle offsets in aeromagnetic anomaly patterns. Our findings suggest that the RG is part of a distributed region of the continental ... |
author2 |
Armadillo, Egidio Ferraccioli, Fausto Crispini, Laura Läufer, Andrea Ghirotto, Alessandro Stefanie Ruppel, Antonia |
format |
Conference Object |
author |
Egidio Armadillo Fausto Ferraccioli Laura Crispini Andreas Läufer Alessandro Ghirotto Antonia Stefanie Ruppel |
spellingShingle |
Egidio Armadillo Fausto Ferraccioli Laura Crispini Andreas Läufer Alessandro Ghirotto Antonia Stefanie Ruppel Geophysical imaging unveils the largest pull-apart basin in East Antarctica |
author_facet |
Egidio Armadillo Fausto Ferraccioli Laura Crispini Andreas Läufer Alessandro Ghirotto Antonia Stefanie Ruppel |
author_sort |
Egidio Armadillo |
title |
Geophysical imaging unveils the largest pull-apart basin in East Antarctica |
title_short |
Geophysical imaging unveils the largest pull-apart basin in East Antarctica |
title_full |
Geophysical imaging unveils the largest pull-apart basin in East Antarctica |
title_fullStr |
Geophysical imaging unveils the largest pull-apart basin in East Antarctica |
title_full_unstemmed |
Geophysical imaging unveils the largest pull-apart basin in East Antarctica |
title_sort |
geophysical imaging unveils the largest pull-apart basin in east antarctica |
publishDate |
2019 |
url |
http://hdl.handle.net/11567/1024194 |
long_lat |
ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(145.000,145.000,-75.000,-75.000) ENVELOPE(161.500,161.500,-72.000,-72.000) ENVELOPE(-58.567,-58.567,-61.967,-61.967) ENVELOPE(158.000,158.000,-70.000,-70.000) ENVELOPE(175.000,175.000,-71.000,-71.000) ENVELOPE(164.000,164.000,-73.667,-73.667) |
geographic |
Antarctic East Antarctica West Antarctica Victoria Land West Antarctic Ice Sheet Transantarctic Mountains Adare Wilkes Subglacial Basin Rennick Davey Oates Coast Adare Basin Southern Cross Mountains |
geographic_facet |
Antarctic East Antarctica West Antarctica Victoria Land West Antarctic Ice Sheet Transantarctic Mountains Adare Wilkes Subglacial Basin Rennick Davey Oates Coast Adare Basin Southern Cross Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Victoria Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Victoria Land West Antarctica |
op_relation |
ispartofbook:AGU 2019 abstracts American Geophysical Union, Fall Meeting 2019 firstpage:T33F-0421-1 lastpage:T33F-0421-1 numberofpages:1 http://hdl.handle.net/11567/1024194 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1796300687937634304 |