Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis
International audience The ~ 183 Ma old Karoo Large Igneous Province extends across southern Africa and is related to magmatism in Antarctica (west Dronning Maud Land and Transantarctic Mountains) and parts of Australasia. Intrusive events, including the emplacement of at least ten dyke swarms, occu...
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ftunivpau:oai:HAL:hal-00904214v1 2023-11-12T04:03:15+01:00 Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis Hastie, W.W. Watkeys, Michael K. Aubourg, Charles School of Geological and Computer sciences University of Natal Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR) TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) 2014-03 https://hal.science/hal-00904214 https://doi.org/10.1016/j.gr.2013.08.010 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2013.08.010 hal-00904214 https://hal.science/hal-00904214 doi:10.1016/j.gr.2013.08.010 ISSN: 1342-937X EISSN: 1878-0571 Gondwana Research https://hal.science/hal-00904214 Gondwana Research, 2014, 25 (2), pp.736-755. ⟨10.1016/j.gr.2013.08.010⟩ AMS Dyke swarm Karoo large Igneous Province Magma flow Mantle plume [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2014 ftunivpau https://doi.org/10.1016/j.gr.2013.08.010 2023-10-15T20:27:55Z International audience The ~ 183 Ma old Karoo Large Igneous Province extends across southern Africa and is related to magmatism in Antarctica (west Dronning Maud Land and Transantarctic Mountains) and parts of Australasia. Intrusive events, including the emplacement of at least ten dyke swarms, occurred between ~ 183 Ma and ~ 174 Ma. We review here the field evidence, structure and geochronology of the dyke swarms and related magmatism as it relates to melt sources and the mantle plume hypothesis for the Karoo LIP. Specifically, the magma flow-related fabric(s) in 90 dykes from five of these swarms is reviewed, paying particular attention to those that converge on triple junctions in southern Africa and Antarctica. The northern Lebombo and Rooi Rand dyke swarms form an integral part of the Lebombo monocline, which converges upon the Karoo triple junction at Mwenezi, southern Zimbabwe. Dykes of the Northern Lebombo dyke swarm (182-178 Ma) appear to have initially intruded vertically, followed later by lateral flow in the youngest dykes. In dykes of the Okavango dyke swarm (178 Ma) there is evidence of steep magma flow proximal to the triple junction, and lateral flow from the southeast to the northwest in the distal regions. This is consistent with the Karoo triple junction and the shallow mantle being a viable magma source for both these dyke swarms. In the Rooi Rand dyke swarm (174 Ma) there is also evidence of vertical and inclined magma flow from north to south. This flow direction cannot be reconciled with the Karoo triple junction, as the northern termination of the Rooi Rand dyke swarm is in east-central Swaziland. The Jutulrøra and Straumsvola dyke swarms of Dronning Maud Land display evidence of sub-vertical magma flow in the north and lateral flow further south. The regional pattern of magma flow is therefore not compatible with direction expected from the Weddell Sea triple junction. The overall flow pattern in Karoo dykes is consistent with the triple junction being an important magma source. ... Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land Weddell Sea HAL e2s UPPA (Université de Pau et des Pays de l'Adour) Dronning Maud Land Jutulrøra ENVELOPE(-0.500,-0.500,-72.250,-72.250) Straumsvola ENVELOPE(-0.333,-0.333,-72.117,-72.117) Transantarctic Mountains Weddell Weddell Sea Gondwana Research 25 2 736 755 |
institution |
Open Polar |
collection |
HAL e2s UPPA (Université de Pau et des Pays de l'Adour) |
op_collection_id |
ftunivpau |
language |
English |
topic |
AMS Dyke swarm Karoo large Igneous Province Magma flow Mantle plume [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
AMS Dyke swarm Karoo large Igneous Province Magma flow Mantle plume [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Hastie, W.W. Watkeys, Michael K. Aubourg, Charles Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis |
topic_facet |
AMS Dyke swarm Karoo large Igneous Province Magma flow Mantle plume [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The ~ 183 Ma old Karoo Large Igneous Province extends across southern Africa and is related to magmatism in Antarctica (west Dronning Maud Land and Transantarctic Mountains) and parts of Australasia. Intrusive events, including the emplacement of at least ten dyke swarms, occurred between ~ 183 Ma and ~ 174 Ma. We review here the field evidence, structure and geochronology of the dyke swarms and related magmatism as it relates to melt sources and the mantle plume hypothesis for the Karoo LIP. Specifically, the magma flow-related fabric(s) in 90 dykes from five of these swarms is reviewed, paying particular attention to those that converge on triple junctions in southern Africa and Antarctica. The northern Lebombo and Rooi Rand dyke swarms form an integral part of the Lebombo monocline, which converges upon the Karoo triple junction at Mwenezi, southern Zimbabwe. Dykes of the Northern Lebombo dyke swarm (182-178 Ma) appear to have initially intruded vertically, followed later by lateral flow in the youngest dykes. In dykes of the Okavango dyke swarm (178 Ma) there is evidence of steep magma flow proximal to the triple junction, and lateral flow from the southeast to the northwest in the distal regions. This is consistent with the Karoo triple junction and the shallow mantle being a viable magma source for both these dyke swarms. In the Rooi Rand dyke swarm (174 Ma) there is also evidence of vertical and inclined magma flow from north to south. This flow direction cannot be reconciled with the Karoo triple junction, as the northern termination of the Rooi Rand dyke swarm is in east-central Swaziland. The Jutulrøra and Straumsvola dyke swarms of Dronning Maud Land display evidence of sub-vertical magma flow in the north and lateral flow further south. The regional pattern of magma flow is therefore not compatible with direction expected from the Weddell Sea triple junction. The overall flow pattern in Karoo dykes is consistent with the triple junction being an important magma source. ... |
author2 |
School of Geological and Computer sciences University of Natal Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR) TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Hastie, W.W. Watkeys, Michael K. Aubourg, Charles |
author_facet |
Hastie, W.W. Watkeys, Michael K. Aubourg, Charles |
author_sort |
Hastie, W.W. |
title |
Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis |
title_short |
Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis |
title_full |
Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis |
title_fullStr |
Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis |
title_full_unstemmed |
Magma flow in dyke swarms of the Karoo LIP: Implications for the mantle plume hypothesis |
title_sort |
magma flow in dyke swarms of the karoo lip: implications for the mantle plume hypothesis |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-00904214 https://doi.org/10.1016/j.gr.2013.08.010 |
long_lat |
ENVELOPE(-0.500,-0.500,-72.250,-72.250) ENVELOPE(-0.333,-0.333,-72.117,-72.117) |
geographic |
Dronning Maud Land Jutulrøra Straumsvola Transantarctic Mountains Weddell Weddell Sea |
geographic_facet |
Dronning Maud Land Jutulrøra Straumsvola Transantarctic Mountains Weddell Weddell Sea |
genre |
Antarc* Antarctica Dronning Maud Land Weddell Sea |
genre_facet |
Antarc* Antarctica Dronning Maud Land Weddell Sea |
op_source |
ISSN: 1342-937X EISSN: 1878-0571 Gondwana Research https://hal.science/hal-00904214 Gondwana Research, 2014, 25 (2), pp.736-755. ⟨10.1016/j.gr.2013.08.010⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2013.08.010 hal-00904214 https://hal.science/hal-00904214 doi:10.1016/j.gr.2013.08.010 |
op_doi |
https://doi.org/10.1016/j.gr.2013.08.010 |
container_title |
Gondwana Research |
container_volume |
25 |
container_issue |
2 |
container_start_page |
736 |
op_container_end_page |
755 |
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1782336592971563008 |