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Petrogenesis of strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African Rift

Rosenthal, Anja; Foley, Stephen; Pearson, D. Graham; Nowell, Geoff M.; Tappe, S.


Strongly silica-undersaturated potassic lavas (kamafugites) and carbonatitic tuffs are characteristic of the Toro-Ankole volcanic field in southwestern Uganda, forming the youngest and most northward volcanics of the western branch of the East African Rift. Lavas contain exceptionally low SiO2 (31.8-42.8 wt.%), high CaO (up to 16.6 wt.%) and K2O (up to 7 wt.%). They exhibit moderately enriched correlated Nd (εNd - 0.1 to - 4.7) and Hf (εHf - 0.1 to - 8.8) isotope signatures, indicating...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Earth and Planetary Science Letters
DOI: 10.1016/j.epsl.2009.04.036


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