The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup
New 40 Ar/ 39 Ar data from dykes intruded into Sverdrupfjella and Ahlmanryggen, Dronning Maud Land, Antarctica, indicate that dyke emplacement commenced at c . 207 Ma and lasted until c . 178 Ma. Whereas the ages ascribed to the Karoo-age magmatism contributing to Gondwana breakup are typically infe...
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Geological Society of London
2021
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ftdatacite:10.6084/m9.figshare.c.5612838 2023-05-15T13:40:18+02:00 The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup Morake, Mabuela A. O'Kennedy, Johan N.F. Knoper, Michael W. de Kock, Michiel Kramers, Jan D. Grantham, Geoffry H. Belyanin, Georgy A. Elburg, Marlina A. 2021 https://dx.doi.org/10.6084/m9.figshare.c.5612838 https://geolsoc.figshare.com/collections/The_age_and_palaeomagnetism_of_Jurassic_dykes_western_Dronning_Maud_Land_implications_for_Gondwana_breakup/5612838 unknown Geological Society of London https://dx.doi.org/10.1144/sp518-2021-44 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.5612838 https://doi.org/10.1144/sp518-2021-44 2021-11-05T12:55:41Z New 40 Ar/ 39 Ar data from dykes intruded into Sverdrupfjella and Ahlmanryggen, Dronning Maud Land, Antarctica, indicate that dyke emplacement commenced at c . 207 Ma and lasted until c . 178 Ma. Whereas the ages ascribed to the Karoo-age magmatism contributing to Gondwana breakup are typically inferred as being c . 182 Ma, the data indicate that ages older than c . 192 Ma in the broader Karoo Province are restricted to western Dronning Maud Land, Antarctica, indicating the locality where breakup was initiated. Limited palaeomagnetic data from c . 178–185 Ma dykes combined with published palaeomagnetic data from similar-aged dykes in Vestfjella and the Ferrar Province, suggest that Antarctica had already drifted/rifted significantly away from southern Africa from c . 207 Ma to c . 180 Ma, earlier than previously thought. The data, if correct, require a re-evaluation of the ages ascribed to ocean-floor anomalies used to constrain reconstructions of Gondwana and may provide insight into the history of microcontinental blocks including the Falkland Islands, Haag nunataks, Ellsworth–Whitmore block and Maurice Ewing Bank. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land DataCite Metadata Store (German National Library of Science and Technology) Dronning Maud Land Maurice ENVELOPE(-55.817,-55.817,-63.133,-63.133) Ewing ENVELOPE(-61.257,-61.257,-69.924,-69.924) Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) Haag ENVELOPE(-79.000,-79.000,-77.667,-77.667) Maurice Ewing Bank ENVELOPE(-43.500,-43.500,-50.667,-50.667) Sverdrupfjella ENVELOPE(0.583,0.583,-72.700,-72.700) Haag Nunataks ENVELOPE(-78.400,-78.400,-77.000,-77.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Morake, Mabuela A. O'Kennedy, Johan N.F. Knoper, Michael W. de Kock, Michiel Kramers, Jan D. Grantham, Geoffry H. Belyanin, Georgy A. Elburg, Marlina A. The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
New 40 Ar/ 39 Ar data from dykes intruded into Sverdrupfjella and Ahlmanryggen, Dronning Maud Land, Antarctica, indicate that dyke emplacement commenced at c . 207 Ma and lasted until c . 178 Ma. Whereas the ages ascribed to the Karoo-age magmatism contributing to Gondwana breakup are typically inferred as being c . 182 Ma, the data indicate that ages older than c . 192 Ma in the broader Karoo Province are restricted to western Dronning Maud Land, Antarctica, indicating the locality where breakup was initiated. Limited palaeomagnetic data from c . 178–185 Ma dykes combined with published palaeomagnetic data from similar-aged dykes in Vestfjella and the Ferrar Province, suggest that Antarctica had already drifted/rifted significantly away from southern Africa from c . 207 Ma to c . 180 Ma, earlier than previously thought. The data, if correct, require a re-evaluation of the ages ascribed to ocean-floor anomalies used to constrain reconstructions of Gondwana and may provide insight into the history of microcontinental blocks including the Falkland Islands, Haag nunataks, Ellsworth–Whitmore block and Maurice Ewing Bank. |
format |
Article in Journal/Newspaper |
author |
Morake, Mabuela A. O'Kennedy, Johan N.F. Knoper, Michael W. de Kock, Michiel Kramers, Jan D. Grantham, Geoffry H. Belyanin, Georgy A. Elburg, Marlina A. |
author_facet |
Morake, Mabuela A. O'Kennedy, Johan N.F. Knoper, Michael W. de Kock, Michiel Kramers, Jan D. Grantham, Geoffry H. Belyanin, Georgy A. Elburg, Marlina A. |
author_sort |
Morake, Mabuela A. |
title |
The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup |
title_short |
The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup |
title_full |
The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup |
title_fullStr |
The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup |
title_full_unstemmed |
The age and palaeomagnetism of Jurassic dykes, western Dronning Maud Land: implications for Gondwana breakup |
title_sort |
age and palaeomagnetism of jurassic dykes, western dronning maud land: implications for gondwana breakup |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5612838 https://geolsoc.figshare.com/collections/The_age_and_palaeomagnetism_of_Jurassic_dykes_western_Dronning_Maud_Land_implications_for_Gondwana_breakup/5612838 |
long_lat |
ENVELOPE(-55.817,-55.817,-63.133,-63.133) ENVELOPE(-61.257,-61.257,-69.924,-69.924) ENVELOPE(-14.000,-14.000,-73.167,-73.167) ENVELOPE(-79.000,-79.000,-77.667,-77.667) ENVELOPE(-43.500,-43.500,-50.667,-50.667) ENVELOPE(0.583,0.583,-72.700,-72.700) ENVELOPE(-78.400,-78.400,-77.000,-77.000) |
geographic |
Dronning Maud Land Maurice Ewing Vestfjella Haag Maurice Ewing Bank Sverdrupfjella Haag Nunataks |
geographic_facet |
Dronning Maud Land Maurice Ewing Vestfjella Haag Maurice Ewing Bank Sverdrupfjella Haag Nunataks |
genre |
Antarc* Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land |
op_relation |
https://dx.doi.org/10.1144/sp518-2021-44 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5612838 https://doi.org/10.1144/sp518-2021-44 |
_version_ |
1766131885831880704 |