Abstract
North and south of the long basaltic range running from Addis Ababa to Debra Berhan (Ethiopia) there are large ignimbritic plateaux which are very similar both morphologically and lithologically, and which are considered to be stratigraphically equivalent by previous researchers. Accurate geological reconstructions and many radiometric age determinations have allowed these plateaux to be distinguished into two distinct ignimbritic formations. The first corresponds to the most recent rocks (Miocene) of the « Alaji Series », and the second to the Pliocene « Balchi Series ». The two formations are separated from one another by basalts attributable to the « Termaber » central-type volcanism taking place in the Addis Ababa-Debra Berhan area more recently than in other parts of the Ethiopian plateau.
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This work was financed by Consiglio Nazionale delle Ricerche as part of the programme « Ricerche geologiche e petrogratiche in Africa Orientale ».
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Justin-Visentin, E., Nicoletti, M., Tolomeo, L. et al. Miocene and pliocene volcanic rocks of the addis ababa-debra berhan area (ethiopia). Geo-petrographic and radiometric study. Bull Volcanol 38, 237–253 (1974). https://doi.org/10.1007/BF02599406
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DOI: https://doi.org/10.1007/BF02599406