The Kösdağ Metavolcanics in the southern Central Pontides is exposed between the Izmir-Ankara-Erzincan Suture Belt in the south and the Sakarya Composite Terrane in the north. It comprises an approximately 40 km long tectonic unit, bounded by the splays of the North Anatolian Transform Fault in the north and the Kızılca Thrust in the south. The basement of the unit mainly consists of metabasalts, metaandesites, and metarhyolites with well-developed blastomylonitic textures, interlayered by recrystallized pelagic limestone and chert. Late Cretaceous pelagic limestones of the Dikmen Formation disconformably overlie the basement. Geochemically, the Kösdağ Metavolcanics exhibit enrichment in Th and La relative to Nb (and Ti), indicating subduction-related magmatic signatures. The Kösdağ Metavolcanics are subdivided into two main types as Type 1 and Type 2 based on their relative Zr-Hf enrichment/depletion features. All the members of the Kösdağ Metavolcanics have subalkaline nature (Nb/Y = 0.08-0.19 for Type 1; Nb/Y = 0.05-0.13 for Type 2) and display a calc-alkaline affinity. The high Zr/Nb (38.1-52.9 for Type 1, 2 21.8-41.2 for Type 2), low Zr/Y (4.07-5.25 for Type 1, 1.58-2.44 for Type 2) and Nb/Y (0.08-0.14 for Type 1, 0.05-0.10 for Type 2) signatures of the Kösdağ Metavolcanics indicate that they have derived from a depleted source which has been modified by subduction component. Zircons LA-ICP-MS U-Pb ages from metarhyolite samples range between 94.64 ± 0.77 Ma and 113.2 ± 2.3 Ma suggesting the presence of an intraoceanic subduction zone during the early Late Cretaceous within the Izmir-Ankara-Erzincan branch of the Neotethys Ocean in the Central Pontides.