The main purpose of this study is to determine the comparative geochemical features of the Upper Miocene and Pliocene volcanics outcropping in the southern part of the Yamadağı Region located between Sivas and Malatya, and Pliocene volcanics are transitional - calcalkaline, and transitonal - alkaline in characters, respectively. The determinations based on the trace element data also indicate that Upper Miocene and Pliocene volcanics are transitional and alkaline characters, respectively.Large ion lithophile element (LIL) and high field strength (HFS) element enrichments imply that the volcanics were generatedfrom the enriched mantle source, they may have undergone the crustal contamination. K/Rb - Rb and Y - Rb variation diagramsmay indicate the crustal assimilation - fractional crystallization processes in the Upper Miocene volcanics, and the fractionalcrystallization process in the Pliocene volcanics.When the major and trace element characteristics are considered together with the post - collisional tectonic evolution of theEastern Anatolia; Upper Miocene volcanics have been generated by the crustal contamination of melt derived from mantle by thethickened crust, and Pliocene volcanis reveal little/ no crustal contamination.