Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica
The existence of the Rodinia supercontinent is widely accepted, although the distribution of its constituent cratons and mobile belts and the process and timing of its break-up remain hotly debated. Several models predict that Rodinia break-up involved Neoproterozoic rifting between formerly juxtapo...
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ftunivgenova:oai:iris.unige.it:11567/393825 2024-02-11T09:58:49+01:00 Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica T. A. Jordan F. Ferraccioli ARMADILLO, EGIDIO BOZZO, EMANUELE T. A., Jordan F., Ferraccioli Armadillo, Egidio Bozzo, Emanuele 2010 ELETTRONICO http://hdl.handle.net/11567/393825 eng eng ispartofbook:International Polar Year IPY Oslo Science Conference International Polar Year IPY Oslo Science Conference firstpage:1 lastpage:1 http://hdl.handle.net/11567/393825 info:eu-repo/semantics/conferenceObject 2010 ftunivgenova 2024-01-17T17:42:26Z The existence of the Rodinia supercontinent is widely accepted, although the distribution of its constituent cratons and mobile belts and the process and timing of its break-up remain hotly debated. Several models predict that Rodinia break-up involved Neoproterozoic rifting between formerly juxtaposed East Antarctica and Laurentia. However, the paucity of geophysical exploration has hampered tracing Neoproterozoic rifting in East Antarctica, adding uncertainty to Rodinia reconstructions. We interpret new airborne gravity data to reveal the crustal architecture of the Neoproterozoic rifted margin of Rodinia in East Antarctica. A linear, ~900 km long, positive Airy isostatic gravity anomaly is recognised along the western edge of the Wilkes Subglacial Basin. Gravity and magnetic models reveal a ~10 km thick mafic body emplaced along the leading edge of the Precambrian craton, beneath interpreted Neoproterozoic rift basins. We infer that voluminous mid-crustal(?) mafic magmatism accompanied Rodinia break-up in this part of East Antarctica, and was perhaps coeval with the more weakly magmatic Adelaide Rift Complex in Australia and with continental rifts and mantle-plume related magmatism in South China. Conference Object Antarc* Antarctica East Antarctica Università degli Studi di Genova: CINECA IRIS East Antarctica Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) |
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Open Polar |
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Università degli Studi di Genova: CINECA IRIS |
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language |
English |
description |
The existence of the Rodinia supercontinent is widely accepted, although the distribution of its constituent cratons and mobile belts and the process and timing of its break-up remain hotly debated. Several models predict that Rodinia break-up involved Neoproterozoic rifting between formerly juxtaposed East Antarctica and Laurentia. However, the paucity of geophysical exploration has hampered tracing Neoproterozoic rifting in East Antarctica, adding uncertainty to Rodinia reconstructions. We interpret new airborne gravity data to reveal the crustal architecture of the Neoproterozoic rifted margin of Rodinia in East Antarctica. A linear, ~900 km long, positive Airy isostatic gravity anomaly is recognised along the western edge of the Wilkes Subglacial Basin. Gravity and magnetic models reveal a ~10 km thick mafic body emplaced along the leading edge of the Precambrian craton, beneath interpreted Neoproterozoic rift basins. We infer that voluminous mid-crustal(?) mafic magmatism accompanied Rodinia break-up in this part of East Antarctica, and was perhaps coeval with the more weakly magmatic Adelaide Rift Complex in Australia and with continental rifts and mantle-plume related magmatism in South China. |
author2 |
T. A., Jordan F., Ferraccioli Armadillo, Egidio Bozzo, Emanuele |
format |
Conference Object |
author |
T. A. Jordan F. Ferraccioli ARMADILLO, EGIDIO BOZZO, EMANUELE |
spellingShingle |
T. A. Jordan F. Ferraccioli ARMADILLO, EGIDIO BOZZO, EMANUELE Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica |
author_facet |
T. A. Jordan F. Ferraccioli ARMADILLO, EGIDIO BOZZO, EMANUELE |
author_sort |
T. A. Jordan |
title |
Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica |
title_short |
Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica |
title_full |
Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica |
title_fullStr |
Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica |
title_full_unstemmed |
Rifted margin of Rodinia revealed from airborne gravity in interior East Antarctica |
title_sort |
rifted margin of rodinia revealed from airborne gravity in interior east antarctica |
publishDate |
2010 |
url |
http://hdl.handle.net/11567/393825 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
East Antarctica Wilkes Subglacial Basin |
geographic_facet |
East Antarctica Wilkes Subglacial Basin |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
ispartofbook:International Polar Year IPY Oslo Science Conference International Polar Year IPY Oslo Science Conference firstpage:1 lastpage:1 http://hdl.handle.net/11567/393825 |
_version_ |
1790594590142627840 |