0000000000273377

AUTHOR

Geoff Nowell

showing 2 related works from this author

L’origine des chevaux du site du Mormont (canton deVaud, Suisse) : l’apport des isotopes de carbone, d’oxygène et de strontium

2012

International audience

[SHS.ARCHEO] Humanities and Social Sciences/Archaeology and Prehistory[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory[ SHS.ARCHEO ] Humanities and Social Sciences/Archaeology and PrehistoryArchéozoologieComputingMilieux_MISCELLANEOUS
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Petrogenesis of strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African Rift

2009

Abstract 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 (eNd − 0.1 to − 4.7) and Hf (eHf − 0.1 to − 8.8) isotope signatures, indicating time-integrated enrichment in incompatible elements in the source, attributed to mixing between two metasomatic assemblages, a phlogopite-rich MARID-type and a later carbonate-rich assemblage. The re…

Peridotitegeographygeography.geographical_feature_categoryRiftGeochemistryMantle (geology)Volcanic rockCratonGeophysicsSpace and Planetary ScienceGeochemistry and PetrologyUltramafic rockEast African RiftEarth and Planetary Sciences (miscellaneous)GeologyPetrogenesisEarth and Planetary Science Letters
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