Abstract: In the study area, where Devonian, Permo-Carboniferous, Jurassic, Cretaceous and Tertiary rocks crop out, volcanics produced through polyphase volcanism are the most abundant lithological units. The Devonian includes Pulur metamorphics that havelocally been intruded by Gümüşhane granite, whilst the Permo-Carboniferous overlying the Pulur metamorphics with an angularunconformity comprises coalbearing sediments. In the light of field data and major element analyses, the volcanics represented bybasalt, andesite, trachyte, dacite and rhyolite of the Liassic (Jurassic), Upper Cretaceous, Eocene and Miocene age groups, havebeen the main subject of this paper. Studies have revealed that most of these samples are calc-alkaline and alkaline, whilst only afew of them were specified as tholeiitic in composition. Except for several Liassic ones comprising entirely simatic, all samples ofthese volcanics, as the derivatives of magmas subjected to fractional crystallization, are rich in sialic material. The studies have alsoshown that the great majority of the volcanics in the region are "orogenic region volcanics" in character, whilst the rest are the products of rifting occurred in different times.