Ghibe River gorge is located in Southwestern Ethiopia, in the central part of Omo-GhibernRiver Basin. The main objective of this study was to constrain the petrogenesis of GhibernRiver gorge basalts using the geochemical signature of major and trace elements andrnthereby to fill the gap of geochemical data and geochemical process that control thernGhibe River gorge basalts evolution. The ICP-OES and ICP-MS geochemical methodsrnwere used for major and trace element analysis, respectively. The study area generallyrncomprises of dominantly basalt, and some trachyte and tuff, with aphyric to sparselyrnporphyritic texture. Classification of the basalts on TAS variation diagram of LeBas et al.,rn(1986) Ghibe River gorge samples fall in the basalt field and considered to be alkaline inrncomposition. The Ghibe gorge basalts have low content of MgO (3.35-6.00 wt %) andrncompatible trace elements (Ni, Cr and Co), and positive correlations of Al2O3 and CaOrnwith MgO, suggest that fractionation of olivine, plagioclase and pyroxene. Given that thernhigh ratio of incompatible elements (Ce/Pb, Nb/U), which are not affected by fractionalrncrystallization and low ratio of Nb/Pb and Nb/U, Ghibe River gorge basalts are notrnaffected by crustal contamination, rather they indicate their derivation from lithosphericrnmantle.rnThe positive anomaly of Ba in the primitive mantle normalized multi-element variationrndiagram shows the presence of amphibole which is stable in lithospheric mantle.rnTherefore, this signifies their derivation from lithospheric mantle. The flat HREE patternrntogether with (Gd/Y)n = 1.02-1.14 suggests that Ghibe River gorge basalts were derivedrnfrom spinel peridotite, with no significant contamination by crustal rocks.