Geochemistry of the Fejej Tuffs (South Omo, Ethiopia), their Tephrostratigraphical Correlation with Plio-Pleistocene Formations in the Omo-Turkana Basin

Cécile CHAPON, Jean-Jacques BAHAIN, Yonas BEYENE, Jean-Baptiste BILCOT, Christophe GUY, Michel JULLIEN, Henry de LUMLEY & Olivier PROVITINA

en Comptes Rendus Palevol 10 (4) - Pages 251-258

Published on 30 June 2011

The FJ-1 Tuff and three additional isolated outcrops of volcanic tuffs listed in the Fejej area (South Omo, Ethiopia) are associated with a single volcanic event and correspond to the same ash deposit subsequently truncated by erosion. Data from new chemical analyses given by X-ray fluorescence allow correlation of these tuffs with the Borana Tuff of the Koobi Fora Formation, which is itself correlated with a tuff in the Upper G member or with the H-1 tuff of the Shungura formation. The geochronological assessment of this tephra is in agreement with previous magnetostratigraphical and biostratigraphical studies, attributing the Fejej FJ-1 Tuff to between 1.95 to 1.90 Ma.


Tephrostratigraphy, Ethiopia, Omo-Turkana Basin, Plio-Pleistocene, Volcano-sedimentary formations, Glass shards, X ray fluorescence

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