Abstract: Recent studies of the Tertiary volcanism in the Eastern Black Sea region (Gümüşhane-Alucra-ŞebinkarahisarGölköy) revealed that the voluminous andesites, dacites and pyroclastics are of Lutetian age. The suite is at the calcic end ofthe calc-alkaline suite. The rocks are oversaturated, quite sodic with Na2O > K2O and generally rich in Al2Oa. The AFM trend,the alkali enrichment and the trend of total iron-MgO ratio of the analysed rocks show that the chemical composition of theEocene volcanics of the Black Sea region are somewhat similar to the composition of the volcanic products which occur alongthe closing boundaries of the plates. it is probable that a trench occurred along the north Anatolian Land Continentalmargin. As the slab of oceanic floor of the North Anatolian Tethys, and the interstitial water incorporated in slab,descended beneath the North Anatolian land the voluminous calc-alkaline andesites resulted during the Lutetian. Theoccurence of the batholitic granites of Oligocene age, which are intensely exposed in the Black Sea region, implies thatthe rate of the plate motion was higher during Oligocene, as a consequence, high monutains emerged and regressionoccurred.