Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system
International audience The Umkondo Large Igneous Province (LIP) is represented by widespread (∼2.0 × 106 km2) mafic intrusions that were rapidly emplaced (1112-1108 Ma) into the Kalahari craton of southern Africa and the formerly adjacent Grunehogna Province of Antarctica during Rodinia assembly. Ve...
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01004015 https://doi.org/10.1016/j.precamres.2014.05.006 |
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ftccsdartic:oai:HAL:insu-01004015v1 2023-05-15T13:59:28+02:00 Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system De Kock, Michiel, Ernst, Richard, Söderlund, Ulf Jourdan, Fred Le Gall, Bernard Bertrand, Hervé Chisonga, Benny, Beukes, Nicolas J. Rajesh, H.M. Moseki, L.M. Fuchs, R. PPM Group University of Johannesburg Department of Geology University of Johannesburg University of Johannesburg (UJ)-University of Johannesburg (UJ) Department of Earth Sciences Ottawa Carleton University Department of Geology, Geobiosphere Science Centre Lund University Lund Laboratory for Isotope Geology Swedish Museum of Natural History (NRM) Curtin University Perth Planning and Transport Research Centre (PATREC) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon) CAE Mining Africa Department of Geology University of Botswana University of KwaZulu-Natal (UKZN) Geological Survey of Botswana 2014-08-04 https://hal-insu.archives-ouvertes.fr/insu-01004015 https://doi.org/10.1016/j.precamres.2014.05.006 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.precamres.2014.05.006 insu-01004015 https://hal-insu.archives-ouvertes.fr/insu-01004015 doi:10.1016/j.precamres.2014.05.006 ISSN: 0301-9268 Precambrian Research https://hal-insu.archives-ouvertes.fr/insu-01004015 Precambrian Research, Elsevier, 2014, 249, pp.129-143. ⟨10.1016/j.precamres.2014.05.006⟩ Mesoproterozoic Large Igneous Province Geochronology Rodinia Kalahari craton Dyke swarms [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2014 ftccsdartic https://doi.org/10.1016/j.precamres.2014.05.006 2021-10-24T13:20:20Z International audience The Umkondo Large Igneous Province (LIP) is represented by widespread (∼2.0 × 106 km2) mafic intrusions that were rapidly emplaced (1112-1108 Ma) into the Kalahari craton of southern Africa and the formerly adjacent Grunehogna Province of Antarctica during Rodinia assembly. Very few Umkondo-aged dykes have been identified before, resulting in a poor understanding of this LIP's plumbing system and origin. Here we report six new ∼1110 Ma U-Pb TIMS baddeleyite ages for various dolerite dykes, which, when coupled with geochemistry from some of the dykes, suggest association with the Umkondo LIP. The distribution of dykes defines distinct radiating swarms, which locate two separate magmatic centers on the northern margin of the Kalahari craton, and a third less robust center on the SE margin. The Umkondo intrusions' geochemistry indicates significant partial melting of the sub-continental mantle lithosphere (SCLM) and requires a transient thermal anomaly in the mantle. A viable model sees a mantle plume ascend beneath the craton and split into different portions that moved and ascended to different lithospheric thin-spots along the margins of the craton. As an alternative, the rise in mantle temperature associated with continental aggregation at this time is considered sufficient to cause partial melting of the SCLM without any plume involvement. Specific features of the Umkondo LIP's plumbing system are supportive of either model, and an approach of multiple working hypotheses is recommended. Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Grunehogna ENVELOPE(-2.750,-2.750,-72.033,-72.033) Precambrian Research 249 129 143 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Mesoproterozoic Large Igneous Province Geochronology Rodinia Kalahari craton Dyke swarms [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Mesoproterozoic Large Igneous Province Geochronology Rodinia Kalahari craton Dyke swarms [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes De Kock, Michiel, Ernst, Richard, Söderlund, Ulf Jourdan, Fred Le Gall, Bernard Bertrand, Hervé Chisonga, Benny, Beukes, Nicolas J. Rajesh, H.M. Moseki, L.M. Fuchs, R. Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system |
topic_facet |
Mesoproterozoic Large Igneous Province Geochronology Rodinia Kalahari craton Dyke swarms [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The Umkondo Large Igneous Province (LIP) is represented by widespread (∼2.0 × 106 km2) mafic intrusions that were rapidly emplaced (1112-1108 Ma) into the Kalahari craton of southern Africa and the formerly adjacent Grunehogna Province of Antarctica during Rodinia assembly. Very few Umkondo-aged dykes have been identified before, resulting in a poor understanding of this LIP's plumbing system and origin. Here we report six new ∼1110 Ma U-Pb TIMS baddeleyite ages for various dolerite dykes, which, when coupled with geochemistry from some of the dykes, suggest association with the Umkondo LIP. The distribution of dykes defines distinct radiating swarms, which locate two separate magmatic centers on the northern margin of the Kalahari craton, and a third less robust center on the SE margin. The Umkondo intrusions' geochemistry indicates significant partial melting of the sub-continental mantle lithosphere (SCLM) and requires a transient thermal anomaly in the mantle. A viable model sees a mantle plume ascend beneath the craton and split into different portions that moved and ascended to different lithospheric thin-spots along the margins of the craton. As an alternative, the rise in mantle temperature associated with continental aggregation at this time is considered sufficient to cause partial melting of the SCLM without any plume involvement. Specific features of the Umkondo LIP's plumbing system are supportive of either model, and an approach of multiple working hypotheses is recommended. |
author2 |
PPM Group University of Johannesburg Department of Geology University of Johannesburg University of Johannesburg (UJ)-University of Johannesburg (UJ) Department of Earth Sciences Ottawa Carleton University Department of Geology, Geobiosphere Science Centre Lund University Lund Laboratory for Isotope Geology Swedish Museum of Natural History (NRM) Curtin University Perth Planning and Transport Research Centre (PATREC) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon) CAE Mining Africa Department of Geology University of Botswana University of KwaZulu-Natal (UKZN) Geological Survey of Botswana |
format |
Article in Journal/Newspaper |
author |
De Kock, Michiel, Ernst, Richard, Söderlund, Ulf Jourdan, Fred Le Gall, Bernard Bertrand, Hervé Chisonga, Benny, Beukes, Nicolas J. Rajesh, H.M. Moseki, L.M. Fuchs, R. |
author_facet |
De Kock, Michiel, Ernst, Richard, Söderlund, Ulf Jourdan, Fred Le Gall, Bernard Bertrand, Hervé Chisonga, Benny, Beukes, Nicolas J. Rajesh, H.M. Moseki, L.M. Fuchs, R. |
author_sort |
De Kock, Michiel, |
title |
Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system |
title_short |
Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system |
title_full |
Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system |
title_fullStr |
Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system |
title_full_unstemmed |
Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system |
title_sort |
dykes of the 1.11 ga umkondo lip, southern africa: clues to a complex plumbing system |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01004015 https://doi.org/10.1016/j.precamres.2014.05.006 |
long_lat |
ENVELOPE(-2.750,-2.750,-72.033,-72.033) |
geographic |
Grunehogna |
geographic_facet |
Grunehogna |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0301-9268 Precambrian Research https://hal-insu.archives-ouvertes.fr/insu-01004015 Precambrian Research, Elsevier, 2014, 249, pp.129-143. ⟨10.1016/j.precamres.2014.05.006⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.precamres.2014.05.006 insu-01004015 https://hal-insu.archives-ouvertes.fr/insu-01004015 doi:10.1016/j.precamres.2014.05.006 |
op_doi |
https://doi.org/10.1016/j.precamres.2014.05.006 |
container_title |
Precambrian Research |
container_volume |
249 |
container_start_page |
129 |
op_container_end_page |
143 |
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1766268040843886592 |