Department of Geology, Bu Ali Sina University, Hamadan andYoung Researchers Club of Kurdistan, IranEach granitoid type is generated and emplaced in every specifictectonic setting and each stage of the Wilson cycle is characterizedby typical associations of granitoids. Field, mineralogical, petro-logical and geochemical characteristics are important for subdivi-sion of granites to several types (Barbarin, 1990; Barbarin, 1999).Various types of granitic rocks occur in Sanandaj-Sirjan zone,Zagros Orogen, Iran. Outcrops of S-type granites have beenreported from many localities such as Hamadan (Alvand), Azna,Kolahghazi and Muteh. I-type, M-type and H-type granites havebeen studied in many parts of Sanandaj-Sirjan zone such asHamadan (Alvand), Boroujerd, Astaneh, Saqqez and Ghorveh.A-type granites are less abundant but have been reported fromsome localities such as Saqqez and Almagholagh. Radiometricages have indicated upper Jurassic to Tertiary ages for major plu-tonic bodies, specially for granitic rocks of Sanandaj-Sirjan zone.These bodies indicate a magmatic suite of an arc setting followedby collisional and post-collisional magmatism. With consideringplagiogranites of Kermanshah ophiolitic complex, a nearly com-plete range of plutonism related to a Wilson cycle can be observedin Sanandaj-Sirjan zone during Mesozoic Era.