Abstract: Petrclogical analyses of the Erdembaba volcanics in tha Central Pontides region are investigated and the mode of formation and genesis are interpreted. Pliocene volcanism is hyalodacitic showing characters of intermediate acidic rocks of the calcalkaline series. Petrochemical characteristics ofthe Erdembaba volcanics point out that they might have been originated from continental crust as aresult of anatexis.