Emplacement history of the Central Anatolian Ophiolites: insights from the Felahiye Ophiolite in Central Türkiye

The Central Anatolian Crystalline Complex (CACC) is represented by Late Cretaceous Barrovian-type metamorphism, ophiolite obduction and numerous intrusive granitoid rocks. The Felahiye Ophiolite, which is a part of the Central Anatolian Ophiolites (CAOs), represents a significant remnant of the Late Cretaceous oceanic lithosphere in the eastern CACC. However, the exact origin and polarity of the subduction zones involved in the formation of these ophiolites and m & eacute;langes remain unclear. This study presents new field, geochemical, and geochronological data from the Felahiye Ophiolite to address these critical questions. The integration of geochemical, petrographic, and field data supports the interpretation that the Felahiye Ophiolite is a remnant of the Late Cretaceous supra-subduction type oceanic crust. U-Pb zircon crystallization age of 92.0 +/- 1.1 Ma was obtained from a cumulate gabbro of the Felahiye Ophiolite. Hafnium isotope compositions of these zircons (epsilon Hf(t) = +8 to + 12) suggest a depleted mantle source. 40Ar/39Ar dating of amphibole from a gabbro provided a cooling age of 69.4 +/- 3.2 Ma, suggesting thermal influence of granitoid intrusions following ophiolite emplacement. We propose a new model for the origin of the CAOs, emphasizing eastward subduction of an ocean basin located both east and west of the CACC. This is consistent with the CAOs forming on N-S trending ridges within an eastward-subducting ocean, leading to westward obduction onto the CACC, N-S trending magmatic arc development in the CACC, and distinct geological histories from those of the Tauride Belt Ophiolites.