Abstarct: Granitoid bodies of western part of Yazd which are Oligo-Miocene in age, are located in the central part of Urumiae-Dokhtar volcanic belt. These emplaced in Cretaceous limestone of Taft formation and pyroclastic rocks of Eocene. These rocks generally show granular texture; also, occasionally identified by porphyroid, granophyric, graphic, perthite, myrmecitic and anti-rapakivy textures. On the basis of field observations and petrographic and geochemical studies, Yazd intrusive bodies fall within the range of alkali feldspar granite to tonalite in composition. They belong to high temperature I-type (Cordilleran) ACG, VAG, Post-COLG and HSS groups. Various geochemical diagrams show the enrichment of LILE, LREE and depletion of HREE and HSFE. These are typical characteristics of Calc-alkaline magma type in subduction regime of active continental margins (ACM). Therefore, it is that the magma was generated from the subducted oceanic crust (Neothetis) and evolved mantle wedge above it. The magma is was initially originated on the baxse of the crust through melting processes of the crust, and subsequent differential crystallization, assimilation and contaminations (AFC) all were engaged in the magmatic evolution. According to the microscopic studies and Electron microprobe analysis, most amphiboles of the granitoid bodies of the area are Magnesio–Hornblende type which is a common mafic mineral in distinguishing I–type granites. By implementing various appropriate methods, the temperature and pressure for granitoid bodies of Yazd amphiboles, biotites and feldspars have been determined to fall in the temperature range of 530 to 890°C, pressures range of 0.5 to 4.3 Kb and in depth of 3 to 5.40 kilometers of the Earth's surface. Also, logƒO2 was estimated at-10.70 to –14.13. To distinguish the nature and tectonic setting of the magma, Biotite and amphibole minerals have been used and considering the composition of the minerals especially amphibole, the magma has been determined to be calc-alkaline in nature having a relatively high oxygen fugacity during crystallization and the formation of the active continental margins The intrusion of the West of Yazd granitoid intrusive body into the host Cretaceous carbonate rocks (Taft Formation), has led to the skarn mineralization in the area with the mineral assemblage determined in skarn rocks: Garnet+ Clinopyroxene+Epidote+Tremolite-Actinolite+Chlorite+Calcite+Quartz Paragenetic mineral associations studies show that pyroxene- garnet association with the highest abundance form the baxse mineral assemblage and these two minerals are