SmNd age and REE geochemistry of Proterozoic arc-related igneous rocks in the Richtersveld subprovince, Namaqua Mobile Belt, Southern Africa
Igneous rocks of the Richtersveld Subprovince in South Africa and Namibia form a Palaeo-Mesoproterozoic arc complex, dominated by extrusive andesites and their plutonic equivalents (diorites, tonalites), although the whole spectrum of rock types from ultramafic to felsic is present. SmNd isotope da...
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| Published in | Journal of African earth sciences (1994) Vol. 24; no. 4; pp. 621 - 633 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
01.05.1997
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| Abstract | Igneous rocks of the Richtersveld Subprovince in South Africa and Namibia form a Palaeo-Mesoproterozoic arc complex, dominated by extrusive andesites and their plutonic equivalents (diorites, tonalites), although the whole spectrum of rock types from ultramafic to felsic is present. SmNd isotope data indicate an extrusion age of 2000 Ma, thereby confirming previously published RbSr and UThPb ages. Initial Nd, Sr and Pb isotope ratios indicate a juvenile crust-producing episode at this time, with rapid recycling of young crust to generate rhyolitic and granitic components within the arc complex. The Richtersveld Subprovince represents the oldest crust in the western Namaqua Province, which was subsequently recycled during post 2.0 Ga tectonothermal events, especially the 1200–1000 Ma Kibaran episode.
Les roches magmatiques de la sous-province de Richtersveld en Afrique du sud et Namibie forment un complexe d'arc du Paléo-Mésoprotérozoïque, dominé par des andésites extrusives et leurs équivalents plutoniques (diorites, tonalites), bien qua la gamma totale des types de roches aille d'ultramafique à felsique. Les données isotopiques SmNd indiquent un âge d'extrusion de 2000 Ma, confirmant ainsi les âges RbSr et UThPb déjà publiés. Les rapports isotopiques initiaux de Nd, Sr et Pb indiquent un épisode de production de croûte juvénile à cette époque, avec recyclage rapide de la croûte jeune pour produire les components rhyolitiques et granitiques à l'inérieur du complexe d'arc. La sous-province de Richtersveld représente la croûte la plus ancienne de la Province occidentale de Namaqua, qui a été recyclée ensuite dans les événements tectono-thermiques postérieurs à 2.0 Ga, en particulier l'épisode kibarien de 1200–1000 Ma. |
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| AbstractList | Igneous rocks of the Richtersveld Subprovince in South Africa and Namibia form a Palaeo-Mesoproterozoic arc complex, dominated by extrusive andesites and their plutonic equivalents (diorites, tonalites), although the whole spectrum of rock types from ultramafic to felsic is present. SmNd isotope data indicate an extrusion age of 2000 Ma, thereby confirming previously published RbSr and UThPb ages. Initial Nd, Sr and Pb isotope ratios indicate a juvenile crust-producing episode at this time, with rapid recycling of young crust to generate rhyolitic and granitic components within the arc complex. The Richtersveld Subprovince represents the oldest crust in the western Namaqua Province, which was subsequently recycled during post 2.0 Ga tectonothermal events, especially the 1200–1000 Ma Kibaran episode.
Les roches magmatiques de la sous-province de Richtersveld en Afrique du sud et Namibie forment un complexe d'arc du Paléo-Mésoprotérozoïque, dominé par des andésites extrusives et leurs équivalents plutoniques (diorites, tonalites), bien qua la gamma totale des types de roches aille d'ultramafique à felsique. Les données isotopiques SmNd indiquent un âge d'extrusion de 2000 Ma, confirmant ainsi les âges RbSr et UThPb déjà publiés. Les rapports isotopiques initiaux de Nd, Sr et Pb indiquent un épisode de production de croûte juvénile à cette époque, avec recyclage rapide de la croûte jeune pour produire les components rhyolitiques et granitiques à l'inérieur du complexe d'arc. La sous-province de Richtersveld représente la croûte la plus ancienne de la Province occidentale de Namaqua, qui a été recyclée ensuite dans les événements tectono-thermiques postérieurs à 2.0 Ga, en particulier l'épisode kibarien de 1200–1000 Ma. |
| Author | Reid, D.L. |
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| Title | SmNd age and REE geochemistry of Proterozoic arc-related igneous rocks in the Richtersveld subprovince, Namaqua Mobile Belt, Southern Africa |
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