Lake Tana basin is a major part of the North Western Ethiopian plateau with numerous geologicrnformations and structures. The Lake occupies the center of a large circular basin of at least 100â€“rn120 km in diameter. It is situated within a faulted depression between erosional escarpment tornthe west overseeing the Sudan plains and tectonic escarpment overseeing the Afar depression tornthe east. Most of the previous works regarding petrology and Geochemistry on the Ethiopianrnplateau are regional. Due to its complex geology Lake Tana area has been skipped for detailrnworks. The objective of this research is to study the Tana volcanics form part of the volcanicrnsuccession of the regional flood basalts using a combined geological mapping, petrological andrngeochemical characterization to understand their petrogenesis. The methodologies employed tornachieve the objectives includes fieldwork for mapping and sampling, petrographic investigations,rnmajor and trace element geochemical analysis by ICP-MS and ICP-AES methods respectively.rnAnalysis and interpretation of data have been achieved using different software packages. Thernmajor lithological units identified in the studied area includes: recent lacustrine sediments,rnQuaternary volcanics, Pliocene to Miocene ash tuff and associated basalt, Oligocene rhyolite andrnbasalt. Basanite intrusions and scoria cones are also discussed under the Quaternary volcanics.rnThe Lake Tana area bimodal volcanic rocks have been classified as alkaline and somerntransitional to tholeiitic mafic and sub-alkaline felsic magma series. The same age groups ofrnrocks are co-genetic and related to each other by fractional crystallization process starting fromrnmantle-derived basaltic magma with minimal crustal material involvement. In general, the tracernelement geochemistry representing all rocks is formed in an intra-continental (within plate)rntectonic setting. Oligocene basalts are categorized under LT plateau basalt and also thernOligocene rhyolites are comparable with plateau felsite.