Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia)
We provide an independent test for the proposed pre-breakup fits between the South American and African continental margins based on new palaeomagnetic data. In the course of modelling the opening of the South Atlantic Ocean, several reconstructions have been proposed, which correspond to different...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/380962 2023-11-12T04:26:12+01:00 Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) Owen-Smith, Trishya M. Ganerød, Morgan van Hinsbergen, Douwe J.J. Gaina, Carmen Ashwal, Lewis D. Torsvik, Trond H. Mantle dynamics & theoretical geophysics 2019-06-05 application/pdf https://dspace.library.uu.nl/handle/1874/380962 en eng 0040-1951 https://dspace.library.uu.nl/handle/1874/380962 info:eu-repo/semantics/OpenAccess Cretaceous palaeopole Palaeomagnetic reconstruction Paraná–Etendeka Large Igneous Province South Atlantic Ocean opening Geophysics Earth-Surface Processes Article 2019 ftunivutrecht 2023-11-01T23:20:44Z We provide an independent test for the proposed pre-breakup fits between the South American and African continental margins based on new palaeomagnetic data. In the course of modelling the opening of the South Atlantic Ocean, several reconstructions have been proposed, which correspond to different estimates of the amount of pre-drift extension in the South American and African continental margins, and amounts of displacement along intracontinental accommodation zones. The Paraná–Etendeka Large Igneous Province erupted during a brief time interval between ~ 136 and ~ 131 Ma, just prior to opening of the South Atlantic, and has magmatic products on both the African (Etendeka lavas) and South American (Paraná lavas) plates. Here we provide new palaeomagnetic constraints on the Etendeka volcanic rocks. These yield a declination of D ± ∆ Dx = 314.4 ± 7.0° and inclination of I ± ∆ Ix = − 42.7 ± 8.3° (Plat = 47.5, PLon = 88.9, K = 26.1, A95 = 6.3, n = 21). When our results are combined with another recently published dataset, we obtain an Etendeka palaeopole at 49.1° S, 87.6° E (D ± ∆ Dx = 315.9 ± 3.8°, I ± ∆ Ix = − 43.9 ± 4.4°, K = 23.4, A95 = 3.5, n = 75). We compare three recent models for South Atlantic Ocean opening, discuss which of the models best fits the palaeomagnetic data, and present a revised reconstruction for West Gondwana during the Early Cretaceous. Article in Journal/Newspaper South Atlantic Ocean Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Cretaceous palaeopole Palaeomagnetic reconstruction Paraná–Etendeka Large Igneous Province South Atlantic Ocean opening Geophysics Earth-Surface Processes |
spellingShingle |
Cretaceous palaeopole Palaeomagnetic reconstruction Paraná–Etendeka Large Igneous Province South Atlantic Ocean opening Geophysics Earth-Surface Processes Owen-Smith, Trishya M. Ganerød, Morgan van Hinsbergen, Douwe J.J. Gaina, Carmen Ashwal, Lewis D. Torsvik, Trond H. Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) |
topic_facet |
Cretaceous palaeopole Palaeomagnetic reconstruction Paraná–Etendeka Large Igneous Province South Atlantic Ocean opening Geophysics Earth-Surface Processes |
description |
We provide an independent test for the proposed pre-breakup fits between the South American and African continental margins based on new palaeomagnetic data. In the course of modelling the opening of the South Atlantic Ocean, several reconstructions have been proposed, which correspond to different estimates of the amount of pre-drift extension in the South American and African continental margins, and amounts of displacement along intracontinental accommodation zones. The Paraná–Etendeka Large Igneous Province erupted during a brief time interval between ~ 136 and ~ 131 Ma, just prior to opening of the South Atlantic, and has magmatic products on both the African (Etendeka lavas) and South American (Paraná lavas) plates. Here we provide new palaeomagnetic constraints on the Etendeka volcanic rocks. These yield a declination of D ± ∆ Dx = 314.4 ± 7.0° and inclination of I ± ∆ Ix = − 42.7 ± 8.3° (Plat = 47.5, PLon = 88.9, K = 26.1, A95 = 6.3, n = 21). When our results are combined with another recently published dataset, we obtain an Etendeka palaeopole at 49.1° S, 87.6° E (D ± ∆ Dx = 315.9 ± 3.8°, I ± ∆ Ix = − 43.9 ± 4.4°, K = 23.4, A95 = 3.5, n = 75). We compare three recent models for South Atlantic Ocean opening, discuss which of the models best fits the palaeomagnetic data, and present a revised reconstruction for West Gondwana during the Early Cretaceous. |
author2 |
Mantle dynamics & theoretical geophysics |
format |
Article in Journal/Newspaper |
author |
Owen-Smith, Trishya M. Ganerød, Morgan van Hinsbergen, Douwe J.J. Gaina, Carmen Ashwal, Lewis D. Torsvik, Trond H. |
author_facet |
Owen-Smith, Trishya M. Ganerød, Morgan van Hinsbergen, Douwe J.J. Gaina, Carmen Ashwal, Lewis D. Torsvik, Trond H. |
author_sort |
Owen-Smith, Trishya M. |
title |
Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) |
title_short |
Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) |
title_full |
Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) |
title_fullStr |
Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) |
title_full_unstemmed |
Testing Early Cretaceous Africa–South America fits with new palaeomagnetic data from the Etendeka Magmatic Province (Namibia) |
title_sort |
testing early cretaceous africa–south america fits with new palaeomagnetic data from the etendeka magmatic province (namibia) |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/380962 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
0040-1951 https://dspace.library.uu.nl/handle/1874/380962 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340269360807936 |