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• W2058392006 abstract "Three small islands (North, Central and South Island) rise above the surface of Lake Turkana in northern Kenya. They represent the tops of Quaternary volcanic centres aligned along the axis of the Turkana Rift. They are links in the continuous chain of axial volcanic centres that run the length of the Eastern Branch of the East African Rift and represent the most recent additions to the architecture of the Rift. Mapping and petrographic studies reveal that the three island volcanic centres have many similarities in their general stratigraphy, structure, and geologic history; however, there are significant differences in relative lithologic abundances and compositions among them. The island volcanic centres are situated near the centres of each of a series of half-graben that are linked together along the length of the Turkana Rift. Estimates of the volumes of basaltic and intermediate volcanic components coupled with likely fractionation histories suggest that significant mafic-ultramafic intrusive complexes underlie the island volcanic centres. These are probably just the most recent additions to magmatically thickened, but mechanically thinned crust in this section of the East African Rift. Trois petites îles (îles du Nord, centrale et du Sud) émergent du lac Turkana dans le Nord du Kenya. Elles constituent le sommet de centres volcaniques quaternaires alignés le long de l'axe du rift du même nom. Elles font partie de la chaîne continue de centres volcaniques axiaux qui suit la branche orientale du rift est-africain. Elles représentent l'addition la plus récente à l'architecture du rift. Les travaux cartographiques et pétrographiques révèlent que ces centres volcaniques insulaires sont semblables entre eux par leur statigraphie, leur stucture et leur histoire géologique; cependant, ils diffèrent par leur abondance lithogique relative et leur composition. Ces îles volcaniques sont situées près d'une série de demi-graben en relais le long du rift de Turkana. L'estimation des volumes de matériel volcanique basaltique et intermédiaire jumelée avec les résultats de la modélisation du fractionnement suggère la présence sous ces îles de complexes mafiques-ultramafiques en quantités non négligeables. C'est là probablement que résident les additions les plus récentes à la croûte de cette section du rift est-africain, croûte épaissie par les magmas mais amincie mécaniquement." @default.
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• W2058392006 date "1994-01-01" @default.
• W2058392006 modified "2023-10-17" @default.
• W2058392006 title "Quaternary volcanic centres of the Turkana Rift, Kenya" @default.
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• W2058392006 doi "https://doi.org/10.1016/0899-5362(94)90051-5" @default.
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