Early opening of Australia and Antarctica: New inferences and regional consequences
International audience Both continental margins of Australia and Antarctica exhibit a very clear gravity anomaly on the satellite free-air gravity data. The detailed sinuosity of these first-order conjugate features matches perfectly, suggesting that they are the signature of the initial continental...
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ftunivparis:oai:HAL:insu-03581051v1 2023-05-15T14:08:44+02:00 Early opening of Australia and Antarctica: New inferences and regional consequences Jacob, Jensen Dyment, Jérôme Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2014 https://hal-insu.archives-ouvertes.fr/insu-03581051 https://doi.org/10.1016/j.tecto.2014.08.020 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2014.08.020 insu-03581051 https://hal-insu.archives-ouvertes.fr/insu-03581051 BIBCODE: 2014Tectp.636.244J doi:10.1016/j.tecto.2014.08.020 Tectonophysics https://hal-insu.archives-ouvertes.fr/insu-03581051 Tectonophysics, 2014, 636, pp.244-256. ⟨10.1016/j.tecto.2014.08.020⟩ <ce:text id="tx0010">Passive margins <ce:text id="tx0015">Plate tectonics <ce:text id="tx0020">Plate reconstructions <ce:text id="tx0025">Australia-Antarctica <ce:text id="tx0030">Zelandia <ce:text id="tx0035">Trans-Antarctic Mountains [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2014 ftunivparis https://doi.org/10.1016/j.tecto.2014.08.020 2023-03-15T17:42:53Z International audience Both continental margins of Australia and Antarctica exhibit a very clear gravity anomaly on the satellite free-air gravity data. The detailed sinuosity of these first-order conjugate features matches perfectly, suggesting that they are the signature of the initial continental breakup and mark the ocean-continent boundary. Another weaker, still clearly deciphered, pair of symmetrical gravity anomalies is identified oceanward. These anomalies are considered as pseudo-isochrons F and G and tentatively dated 128 and 94 Ma. Precise reconstructions of pseudo-isochron F are achieved over three sections of the margin, denoting the relative motion of Australia and East Antarctica, the Polda Block and East Antarctica, and Tasmania and West Antarctica. The Polda Block and Tasmania are transient micro-continents. Tasmania and Australia are reconstructed to align their linear eastern margin. The eastern margins of reconstructed Australia, Tasmania, and West Antarctica on one hand, the western margin of reconstructed Lord Howe Rise and Campbell Plateau on the other hand, fit a small circle of radius 15°, which suggests a transform motion between 128 and 83 Ma along this plate boundary. The reconstruction predicts a gap between East and West Antarctica, probably filled by non-cratonic continental crust compressively deformed and thickened by the SW motion of East Antarctica and participating to the formation of the Trans-Antarctic Mountains. The initial extension between Australia and East Antarctica may be related to the inception of the Kerguelen hotspot, ~ 1000 km to the west. The different rheology of cratons and orogenic terranes has played a role in the style and localization of both extensional and compressional deformations. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica West Antarctica Université de Paris: Portail HAL Antarctic East Antarctica Kerguelen West Antarctica Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) Tectonophysics 636 244 256 |
institution |
Open Polar |
collection |
Université de Paris: Portail HAL |
op_collection_id |
ftunivparis |
language |
English |
topic |
<ce:text id="tx0010">Passive margins <ce:text id="tx0015">Plate tectonics <ce:text id="tx0020">Plate reconstructions <ce:text id="tx0025">Australia-Antarctica <ce:text id="tx0030">Zelandia <ce:text id="tx0035">Trans-Antarctic Mountains [SDU]Sciences of the Universe [physics] |
spellingShingle |
<ce:text id="tx0010">Passive margins <ce:text id="tx0015">Plate tectonics <ce:text id="tx0020">Plate reconstructions <ce:text id="tx0025">Australia-Antarctica <ce:text id="tx0030">Zelandia <ce:text id="tx0035">Trans-Antarctic Mountains [SDU]Sciences of the Universe [physics] Jacob, Jensen Dyment, Jérôme Early opening of Australia and Antarctica: New inferences and regional consequences |
topic_facet |
<ce:text id="tx0010">Passive margins <ce:text id="tx0015">Plate tectonics <ce:text id="tx0020">Plate reconstructions <ce:text id="tx0025">Australia-Antarctica <ce:text id="tx0030">Zelandia <ce:text id="tx0035">Trans-Antarctic Mountains [SDU]Sciences of the Universe [physics] |
description |
International audience Both continental margins of Australia and Antarctica exhibit a very clear gravity anomaly on the satellite free-air gravity data. The detailed sinuosity of these first-order conjugate features matches perfectly, suggesting that they are the signature of the initial continental breakup and mark the ocean-continent boundary. Another weaker, still clearly deciphered, pair of symmetrical gravity anomalies is identified oceanward. These anomalies are considered as pseudo-isochrons F and G and tentatively dated 128 and 94 Ma. Precise reconstructions of pseudo-isochron F are achieved over three sections of the margin, denoting the relative motion of Australia and East Antarctica, the Polda Block and East Antarctica, and Tasmania and West Antarctica. The Polda Block and Tasmania are transient micro-continents. Tasmania and Australia are reconstructed to align their linear eastern margin. The eastern margins of reconstructed Australia, Tasmania, and West Antarctica on one hand, the western margin of reconstructed Lord Howe Rise and Campbell Plateau on the other hand, fit a small circle of radius 15°, which suggests a transform motion between 128 and 83 Ma along this plate boundary. The reconstruction predicts a gap between East and West Antarctica, probably filled by non-cratonic continental crust compressively deformed and thickened by the SW motion of East Antarctica and participating to the formation of the Trans-Antarctic Mountains. The initial extension between Australia and East Antarctica may be related to the inception of the Kerguelen hotspot, ~ 1000 km to the west. The different rheology of cratons and orogenic terranes has played a role in the style and localization of both extensional and compressional deformations. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Jacob, Jensen Dyment, Jérôme |
author_facet |
Jacob, Jensen Dyment, Jérôme |
author_sort |
Jacob, Jensen |
title |
Early opening of Australia and Antarctica: New inferences and regional consequences |
title_short |
Early opening of Australia and Antarctica: New inferences and regional consequences |
title_full |
Early opening of Australia and Antarctica: New inferences and regional consequences |
title_fullStr |
Early opening of Australia and Antarctica: New inferences and regional consequences |
title_full_unstemmed |
Early opening of Australia and Antarctica: New inferences and regional consequences |
title_sort |
early opening of australia and antarctica: new inferences and regional consequences |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03581051 https://doi.org/10.1016/j.tecto.2014.08.020 |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) |
geographic |
Antarctic East Antarctica Kerguelen West Antarctica Campbell Plateau |
geographic_facet |
Antarctic East Antarctica Kerguelen West Antarctica Campbell Plateau |
genre |
Antarc* Antarctic Antarctica East Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica West Antarctica |
op_source |
Tectonophysics https://hal-insu.archives-ouvertes.fr/insu-03581051 Tectonophysics, 2014, 636, pp.244-256. ⟨10.1016/j.tecto.2014.08.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2014.08.020 insu-03581051 https://hal-insu.archives-ouvertes.fr/insu-03581051 BIBCODE: 2014Tectp.636.244J doi:10.1016/j.tecto.2014.08.020 |
op_doi |
https://doi.org/10.1016/j.tecto.2014.08.020 |
container_title |
Tectonophysics |
container_volume |
636 |
container_start_page |
244 |
op_container_end_page |
256 |
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1766280762445791232 |