The Kashan plutons are situ ated in the central part of Urumieh-Dokh tar magmaticarc recording subduction-related magmatism within the Alpine-Himalayan orogeny in Iran.These ro cks consist of differ ent calc-alkaline plutonic rocks including gabbro,gabbroic diorite,microdiorite,mon-zodiorite,tonalite,granodiorite,and granite.The plutons were emplaced into the Jurassic sedimentary units(Shemshak Formation)and the Eocene calc-alkaline volcanic and pyroclastic rocks.New U-Pb zircon ages show that the Kashan plutons formed during two main periods at 35.20±0.71 Ma in the Late Eocene(Priabonian)and at 18.90±0.84,19.26±0.83,19.30±1.2,and 17.3±1.8 Main the Early Mi-ocene(Burdigalian).The reported events in the Kashan plutons imply the final phases of subduction-related magmatism before the collision which happened between the Arabian and Iranian plates in the Middle Miocene.The plutonic activity in the Kashan region occurred during the transition from Eo-cene subduction-related setting to Middle Miocene collisional setting.