Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa
The Umkondo dolerites are present over a wide area in the Kalahari craton, southern Africa. Thirty-nine sampling sites in Botswana and South Africa yielded tightly grouped paleomagnetic directions due south with shallow inclinations and three sites of opposite polarity. The dolerites have U-Pb singl...
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fttexaschristuni:oai:repository.tcu.edu:116099117/21907 2023-10-01T03:52:10+02:00 Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa Gose, Wulf A. Hanson, Richard E. Dalziel, Ian W. D. Pancake, James A. Seidel, Emily K. 2006-09-20 https://repository.tcu.edu/handle/116099117/21907 https://doi.org/10.1029/2005JB003897 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2005JB003897 en eng Wiley https://doi.org/10.1029/2005JB003897 https://repository.tcu.edu/handle/116099117/21907 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2005JB003897 https://publications.agu.org/open-access/ Wulf A. Gose et al. AGU allows final articles to be placed in an institutional repository 6 months after publication, and allows submitted articles to be accessible on the author's personal website. AGU also supports governmental and institutional repositories and access is available to AGU content through CHORUS, usually 12 months after publication. Journal of Geophysical Research: Solid Earth paleomagnetism Precambrian Kalahari craton Article 2006 fttexaschristuni https://doi.org/10.1029/2005JB003897 2023-09-02T22:09:38Z The Umkondo dolerites are present over a wide area in the Kalahari craton, southern Africa. Thirty-nine sampling sites in Botswana and South Africa yielded tightly grouped paleomagnetic directions due south with shallow inclinations and three sites of opposite polarity. The dolerites have U-Pb single-crystal baddeleyite or zircon crystallization ages of 1112 ± 0.5 to 1108 ± 0.9 Ma. These results can be combined with published data from 39 additional Umkondo sites and 33 sites in the Grunehogna Province of Antarctica after restoring East Antarctica to its position next to southern Africa. Grouping the sites geographically yields 10 site mean poles with mean at 64.0°N, 38.8°E, A95 = 3.7°. This Umkondo pole can be correlated with Keweenawan poles from Laurentia. Because both sets of poles are precisely of the same age as well as predominantly of one polarity, the relative orientation of the two cratons within the Rodinia supercontinent is fixed. This implies that the Namaqua-Natal-Maud belt which rims the southern part of the Kalahari craton, faced away from Laurentia. The Umkondo pole combined with published poles suggest that the Kalahari craton remained distinctly south of the Laurentian craton between 1.1 and 1.0 Ga, making it highly unlikely that the two cratons collided. Article in Journal/Newspaper Antarc* Antarctica East Antarctica TCU Digital Repository (Texas Christian University) East Antarctica Grunehogna ENVELOPE(-2.750,-2.750,-72.033,-72.033) Journal of Geophysical Research 111 B9 |
institution |
Open Polar |
collection |
TCU Digital Repository (Texas Christian University) |
op_collection_id |
fttexaschristuni |
language |
English |
topic |
paleomagnetism Precambrian Kalahari craton |
spellingShingle |
paleomagnetism Precambrian Kalahari craton Gose, Wulf A. Hanson, Richard E. Dalziel, Ian W. D. Pancake, James A. Seidel, Emily K. Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa |
topic_facet |
paleomagnetism Precambrian Kalahari craton |
description |
The Umkondo dolerites are present over a wide area in the Kalahari craton, southern Africa. Thirty-nine sampling sites in Botswana and South Africa yielded tightly grouped paleomagnetic directions due south with shallow inclinations and three sites of opposite polarity. The dolerites have U-Pb single-crystal baddeleyite or zircon crystallization ages of 1112 ± 0.5 to 1108 ± 0.9 Ma. These results can be combined with published data from 39 additional Umkondo sites and 33 sites in the Grunehogna Province of Antarctica after restoring East Antarctica to its position next to southern Africa. Grouping the sites geographically yields 10 site mean poles with mean at 64.0°N, 38.8°E, A95 = 3.7°. This Umkondo pole can be correlated with Keweenawan poles from Laurentia. Because both sets of poles are precisely of the same age as well as predominantly of one polarity, the relative orientation of the two cratons within the Rodinia supercontinent is fixed. This implies that the Namaqua-Natal-Maud belt which rims the southern part of the Kalahari craton, faced away from Laurentia. The Umkondo pole combined with published poles suggest that the Kalahari craton remained distinctly south of the Laurentian craton between 1.1 and 1.0 Ga, making it highly unlikely that the two cratons collided. |
format |
Article in Journal/Newspaper |
author |
Gose, Wulf A. Hanson, Richard E. Dalziel, Ian W. D. Pancake, James A. Seidel, Emily K. |
author_facet |
Gose, Wulf A. Hanson, Richard E. Dalziel, Ian W. D. Pancake, James A. Seidel, Emily K. |
author_sort |
Gose, Wulf A. |
title |
Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa |
title_short |
Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa |
title_full |
Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa |
title_fullStr |
Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa |
title_full_unstemmed |
Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa |
title_sort |
paleomagnetism of the 1.1 ga umkondo large igneous province in southern africa |
publisher |
Wiley |
publishDate |
2006 |
url |
https://repository.tcu.edu/handle/116099117/21907 https://doi.org/10.1029/2005JB003897 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2005JB003897 |
long_lat |
ENVELOPE(-2.750,-2.750,-72.033,-72.033) |
geographic |
East Antarctica Grunehogna |
geographic_facet |
East Antarctica Grunehogna |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Journal of Geophysical Research: Solid Earth |
op_relation |
https://doi.org/10.1029/2005JB003897 https://repository.tcu.edu/handle/116099117/21907 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2005JB003897 |
op_rights |
https://publications.agu.org/open-access/ Wulf A. Gose et al. AGU allows final articles to be placed in an institutional repository 6 months after publication, and allows submitted articles to be accessible on the author's personal website. AGU also supports governmental and institutional repositories and access is available to AGU content through CHORUS, usually 12 months after publication. |
op_doi |
https://doi.org/10.1029/2005JB003897 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
B9 |
_version_ |
1778517875277955072 |