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Pleistocene magmatism in a lithospheric transition area; petrogenesis of alkaline and peralkaline lavas from the Baringo-Bogoria Basin, central Kenya Rift


Pleistocene magmatism in a lithospheric transition area; petrogenesis of alkaline and peralkaline lavas from the Baringo-Bogoria Basin, central Kenya Rift



Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre 40(9): 1239-1257



DOI: 10.1139/e03-046

New petrological, geochronological, and geochemical data on basalts, mugearites, peralkaline trachytes, and phonolites from the Baringo-Bogoria Basin, central Kenya Rift, are presented. K-Ar dating indicates that the volcanic rocks were emplaced between 894+ or -13 and 92+ or -5 ka. (super 87) Sr/ (super 86) Sr ranges from 0.70304 to 0.70692, (super 143) Nd/ (super 144) Nd from 0.51237 to 0.51295, (super 206) Pb/ (super 204) Pb from 18.4 to 19.8, (super 207) Pb/ (super 204) Pb from 15.46 to 15.70, and (super 208) Pb/ (super 204) Pb from 38.2 to 40.5. Despite a rather restricted sampling area and a relatively short time span (< or =820 ka), the mineralogical and geochemical variations are not consistent with a simple cogenetic link between the lavas. The studied area is located in a transition zone between two different lithospheric domains (Tanzanian Craton and Panafrican Mobile Belt). We propose that the petrological and geochemical variations of the studied lavas are essentially linked to the nature of the underlying lithosphere. Some basaltic products underwent carbonate contamination, possibly within the crust. Trachytes and phonolites are derived from different basaltic parents through crustal assimilation coupled with fractional crystallization. One phonolite sample contains primary calcite-rich veinlets. Textural relations and geochemical evidence suggest that there is a direct cogenetic link between these carbonate and phonolite melts. The veinlets are the modal expression of a carbonate component included in all the phonolites from the Baringo-Bogoria Basin.

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