Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS?
Although geological comparisons between Australia and North America have provided a basis for various Neoproterozoic Rodinia reconstructions, quantitative support from precisely dated palaeomagnetic poles has so far been lacking. We report U–Pb ages and palaeomagnetic results for two suites of mafic...
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crwiley:10.1046/j.1365-3121.2002.00401.x 2024-09-15T17:47:12+00:00 Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? Wingate, Michael T. D. Pisarevsky, Sergei A. Evans, David A. D. 2002 http://dx.doi.org/10.1046/j.1365-3121.2002.00401.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.2002.00401.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.2002.00401.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 14, issue 2, page 121-128 ISSN 0954-4879 1365-3121 journal-article 2002 crwiley https://doi.org/10.1046/j.1365-3121.2002.00401.x 2024-08-01T04:20:15Z Although geological comparisons between Australia and North America have provided a basis for various Neoproterozoic Rodinia reconstructions, quantitative support from precisely dated palaeomagnetic poles has so far been lacking. We report U–Pb ages and palaeomagnetic results for two suites of mafic sills within the intracratonic Bangemall Basin of Western Australia, one of which is dated at 1070 ± 6 Ma and carries a high‐stability palaeomagnetic remanence. Comparison of the Bangemall palaeopole with Laurentian data suggests that previous reconstructions of eastern Australia against either western Canada (SWEAT) or the western United States (AUSWUS) are not viable at 1070 Ma. This implies that the Pacific Ocean did not form by separation of Australia–Antarctica from Laurentia, and that up to 10 000 km of late Neoproterozoic passive margins need to be matched with other continental blocks within any proposed Rodinia supercontinent. Our results permit a reconstruction (AUSMEX) that closely aligns late Mesoproterozoic orogenic belts in north‐east Australia and southernmost Laurentia. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Terra Nova 14 2 121 128 |
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Wiley Online Library |
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English |
description |
Although geological comparisons between Australia and North America have provided a basis for various Neoproterozoic Rodinia reconstructions, quantitative support from precisely dated palaeomagnetic poles has so far been lacking. We report U–Pb ages and palaeomagnetic results for two suites of mafic sills within the intracratonic Bangemall Basin of Western Australia, one of which is dated at 1070 ± 6 Ma and carries a high‐stability palaeomagnetic remanence. Comparison of the Bangemall palaeopole with Laurentian data suggests that previous reconstructions of eastern Australia against either western Canada (SWEAT) or the western United States (AUSWUS) are not viable at 1070 Ma. This implies that the Pacific Ocean did not form by separation of Australia–Antarctica from Laurentia, and that up to 10 000 km of late Neoproterozoic passive margins need to be matched with other continental blocks within any proposed Rodinia supercontinent. Our results permit a reconstruction (AUSMEX) that closely aligns late Mesoproterozoic orogenic belts in north‐east Australia and southernmost Laurentia. |
format |
Article in Journal/Newspaper |
author |
Wingate, Michael T. D. Pisarevsky, Sergei A. Evans, David A. D. |
spellingShingle |
Wingate, Michael T. D. Pisarevsky, Sergei A. Evans, David A. D. Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? |
author_facet |
Wingate, Michael T. D. Pisarevsky, Sergei A. Evans, David A. D. |
author_sort |
Wingate, Michael T. D. |
title |
Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? |
title_short |
Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? |
title_full |
Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? |
title_fullStr |
Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? |
title_full_unstemmed |
Rodinia connections between Australia and Laurentia: no SWEAT, no AUSWUS? |
title_sort |
rodinia connections between australia and laurentia: no sweat, no auswus? |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1046/j.1365-3121.2002.00401.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.2002.00401.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.2002.00401.x |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Terra Nova volume 14, issue 2, page 121-128 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3121.2002.00401.x |
container_title |
Terra Nova |
container_volume |
14 |
container_issue |
2 |
container_start_page |
121 |
op_container_end_page |
128 |
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1810496056089116672 |