Petrogenesis of Primitive Lavas from the Toro Ankole and Virunga Volcanic Provinces: Metasomatic Mineralogy beneath East Africa's Western Rift

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dc.contributor.authorPitcavage, Erica
dc.contributor.authorFurman, Tanya
dc.contributor.authorNelson, Wendy R.
dc.contributor.authorKalegga, Peggy K.
dc.contributor.authorBarifaijo, Erasmus
dc.date.accessioned2022-06-08T10:58:53Z
dc.date.available2022-06-08T10:58:53Z
dc.date.issued2021
dc.description.abstractGeochemical analysis of magmas erupted in continental rifts are a valuable tool for understanding the compositional, physical, and thermal controls on rift related magmatism. Bulk rock geochemistry and geochronology of lavas from volcanic fields in the Western Rift of the East African Rift System provide insight into the sources and processes of petrogenesis of magmas in the region, as well as insight into the spatial variability of metasomatic history of the lithospheric mantle. Lava compositions from three primitive volcanic fields in southwestern Uganda (Bufumbira, Virunga Volcanic Province; Katwe-Kikorongo and Bunyaruguru, Toro Ankole Volcanic Province) are potassic (K2O/Na2O = 0.3–2.7) and enriched in incompatible trace elements (e.g., (La/Yb)n = 12–132); the Toro Ankole samples are also silica-undersaturated. The compositions of these lavas require significant input from metasomatized sub-continental lithospheric mantle (SCLM), likely consisting of a pyroxenite containing variable amounts of garnet, amphibole, phlogopite, and accessory minerals including titanite, apatite, and zircon, produced through infiltration by spatially varying carbonatitic and silicate metasomatic agents. A subset of lavas record 40Ar/39Ar ages = 21–662 ka, with minor geographic and compositional trends apparent in the temporal development of the volcanic fields.en_US
dc.identifier.citationPitcavage, E., Furman, T., Nelson, W. R., Kalegga, P. K., & Barifaijo, E. (2021). Petrogenesis of primitive lavas from the Toro Ankole and Virunga Volcanic Provinces: Metasomatic mineralogy beneath East Africa's Western Rift. Lithos, 396, 106192.https://doi.org/10.1016/j.lithos.2021.106192en_US
dc.identifier.issn0024-4937
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/3822
dc.language.isoenen_US
dc.publisherLithosen_US
dc.relation.ispartofseriesKampala International University Dar Es Salaam Constituent College Kampala International University Dar Es Salaam Constituent College Kampala International University Dar Es Salaam Constituent College;
dc.subjectEast african rift; Metasomatism; Alkaline volcanism; Lithospheric meltingen_US
dc.titlePetrogenesis of Primitive Lavas from the Toro Ankole and Virunga Volcanic Provinces: Metasomatic Mineralogy beneath East Africa's Western Riften_US
dc.typeArticleen_US
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