Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review
The Kalahari Craton was initially stabilized following cessation of Palaeoproterozoic orogenesis in southern Africa at ca. 1.8 Ga. Subsequent Mesoproterozoic intraplate magmatism at ca. 1.4–1.35 Ga formed a series of alkaline and carbonatitic complexes in the southern part of the craton. Original vo...
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ftnerc:oai:nora.nerc.ac.uk:870 2024-06-09T07:40:24+00:00 Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review Hanson, R Harmer, R.E. Blenkinsop, T.G. Bullen, D.S. Dalziel, I.W.D. Gose, W.A. Hall, R.P. Kampunzu, A.B. Key, R.M. Mukwakwami, J Munyanyiwa, H Pancake, J.A. Seidel, E.K. Ward, S.E. 2006 http://nora.nerc.ac.uk/id/eprint/870/ http://www.elsevier.com/wps/find/journaldescription.cws_home/691/description#description unknown Elsevier Hanson, R; Harmer, R.E.; Blenkinsop, T.G.; Bullen, D.S.; Dalziel, I.W.D.; Gose, W.A.; Hall, R.P.; Kampunzu, A.B.; Key, R.M.; Mukwakwami, J; Munyanyiwa, H; Pancake, J.A.; Seidel, E.K.; Ward, S.E. 2006 Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review. Journal of African Earth Sciences, 46 (1-2). 141-167. https://doi.org/10.1016/j.jafrearsci.2006.01.016 <https://doi.org/10.1016/j.jafrearsci.2006.01.016> Earth Sciences Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.1016/j.jafrearsci.2006.01.016 2024-05-15T08:39:04Z The Kalahari Craton was initially stabilized following cessation of Palaeoproterozoic orogenesis in southern Africa at ca. 1.8 Ga. Subsequent Mesoproterozoic intraplate magmatism at ca. 1.4–1.35 Ga formed a series of alkaline and carbonatitic complexes in the southern part of the craton. Original volcanic structures are partly preserved in some of the complexes, and a variety of intrusive rocks (e.g., quartz syenite, nepheline syenite, pyroxenite, ijolite, carbonatite) are present. The Premier kimberlite cluster was emplaced in the same region at ca. 1.2 Ga, but available geochronology indicates that the main alkaline magmatism preceded 1.2–1.0 Ga orogenesis in the Namaqua–Natal–Maud Belt along the southern craton margin. Another, more extensive intraplate magmatic event at ca. 1.1 Ga formed the Umkondo Igneous Province, which is recognized over an area of 2.0 · 106 km2 on the Kalahari Craton, including a detached fragment now located in Antarctica. Much of the province comprises high-level mafic intrusions, but erosional remnants of basalt lava piles and bimodal basalt/rhyolite assemblages are also present. Most of the mafic rocks are continental tholeiites, but trace-element geochemistry reveals distinct subgroups that cannot be related by crustal-level assimilation/fractional crystallization processes or by partial melting of a uniform mantle source. Geochronological and palaeomagnetic data indicate that enormous volumes of tholeiitic magma were emplaced within the province in a narrow time frame at ca. 1112–1106 Ma, which is inferred to record uprise of a mantle plume behind the Namaqua–Natal–Maud Belt. Article in Journal/Newspaper Antarc* Antarctica Natural Environment Research Council: NERC Open Research Archive Journal of African Earth Sciences 46 1-2 141 167 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Hanson, R Harmer, R.E. Blenkinsop, T.G. Bullen, D.S. Dalziel, I.W.D. Gose, W.A. Hall, R.P. Kampunzu, A.B. Key, R.M. Mukwakwami, J Munyanyiwa, H Pancake, J.A. Seidel, E.K. Ward, S.E. Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review |
topic_facet |
Earth Sciences |
description |
The Kalahari Craton was initially stabilized following cessation of Palaeoproterozoic orogenesis in southern Africa at ca. 1.8 Ga. Subsequent Mesoproterozoic intraplate magmatism at ca. 1.4–1.35 Ga formed a series of alkaline and carbonatitic complexes in the southern part of the craton. Original volcanic structures are partly preserved in some of the complexes, and a variety of intrusive rocks (e.g., quartz syenite, nepheline syenite, pyroxenite, ijolite, carbonatite) are present. The Premier kimberlite cluster was emplaced in the same region at ca. 1.2 Ga, but available geochronology indicates that the main alkaline magmatism preceded 1.2–1.0 Ga orogenesis in the Namaqua–Natal–Maud Belt along the southern craton margin. Another, more extensive intraplate magmatic event at ca. 1.1 Ga formed the Umkondo Igneous Province, which is recognized over an area of 2.0 · 106 km2 on the Kalahari Craton, including a detached fragment now located in Antarctica. Much of the province comprises high-level mafic intrusions, but erosional remnants of basalt lava piles and bimodal basalt/rhyolite assemblages are also present. Most of the mafic rocks are continental tholeiites, but trace-element geochemistry reveals distinct subgroups that cannot be related by crustal-level assimilation/fractional crystallization processes or by partial melting of a uniform mantle source. Geochronological and palaeomagnetic data indicate that enormous volumes of tholeiitic magma were emplaced within the province in a narrow time frame at ca. 1112–1106 Ma, which is inferred to record uprise of a mantle plume behind the Namaqua–Natal–Maud Belt. |
format |
Article in Journal/Newspaper |
author |
Hanson, R Harmer, R.E. Blenkinsop, T.G. Bullen, D.S. Dalziel, I.W.D. Gose, W.A. Hall, R.P. Kampunzu, A.B. Key, R.M. Mukwakwami, J Munyanyiwa, H Pancake, J.A. Seidel, E.K. Ward, S.E. |
author_facet |
Hanson, R Harmer, R.E. Blenkinsop, T.G. Bullen, D.S. Dalziel, I.W.D. Gose, W.A. Hall, R.P. Kampunzu, A.B. Key, R.M. Mukwakwami, J Munyanyiwa, H Pancake, J.A. Seidel, E.K. Ward, S.E. |
author_sort |
Hanson, R |
title |
Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review |
title_short |
Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review |
title_full |
Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review |
title_fullStr |
Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review |
title_full_unstemmed |
Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review |
title_sort |
mesoproterozoic intraplate magmatism in the kalahari craton : a review |
publisher |
Elsevier |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/870/ http://www.elsevier.com/wps/find/journaldescription.cws_home/691/description#description |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Hanson, R; Harmer, R.E.; Blenkinsop, T.G.; Bullen, D.S.; Dalziel, I.W.D.; Gose, W.A.; Hall, R.P.; Kampunzu, A.B.; Key, R.M.; Mukwakwami, J; Munyanyiwa, H; Pancake, J.A.; Seidel, E.K.; Ward, S.E. 2006 Mesoproterozoic intraplate magmatism in the Kalahari Craton : a review. Journal of African Earth Sciences, 46 (1-2). 141-167. https://doi.org/10.1016/j.jafrearsci.2006.01.016 <https://doi.org/10.1016/j.jafrearsci.2006.01.016> |
op_doi |
https://doi.org/10.1016/j.jafrearsci.2006.01.016 |
container_title |
Journal of African Earth Sciences |
container_volume |
46 |
container_issue |
1-2 |
container_start_page |
141 |
op_container_end_page |
167 |
_version_ |
1801383821980991488 |