Abstarct: c pluton is located in the NE of Isfahan (SE Ardestan) and includes an area with 70 km2 by following geographical coordinate 52ْ 18' to 52ْ 29' eastern longitudes and 32ْ 59' to 33ْ 12' northern latitudes. This area belongs to Urumieh- Dokhtar structural zone. This pluton is manifested in the form of dikes and stocks, and in general they have NW- SE trend. The studied pluton has been emplaced in the Eocene volcanosedimentary and volcanic rocks. Petrographical studies and field observations indicate that Zafarghand granitoidic pluton include compositional range of olivine gabbro, gabbro, diorite, quartzdiorite, granodiorite, granite and alkali- feldspar- granite. With respect to all of the geological evidence, the studied pluton has two compositional rock groups: 1- mafic- intermediate (olivine gabbro, gabbro, diorite and quartzdiorite) and 2- felsic (granodiorite, granite and alkali- feldspar- granite). Mafic- intermediate rocks are precursor compare with felsic rocks. But baxsed on, magma mingling and mixing, age difference between these two rock groups are not so much, and they are cogenetic and synchronous. Petrographical studies indicate that these rocks mainly composed of olivine, augite, hornblende, biotite, plagioclase, orthoclase and quartz (major minerals) and a little apatite, magnetite, zircon and sphene (accessory minerals). These rocks show granular, ophitic, myrmekitic, graphic and porphyroidic textures. Trend of major and trace elements on the geochemical variation diagrams indicate a bimodality between the rock compositions of this pluton. Petrographic and field observations confirm these suggestions. Geochemical characteristics show that rocks of this pluton are medium to high potassium calc- alkaline and mextaluminous. In geochemical diagrams (Harker diagrams, compatible- compatible, uncompatible - uncompatible, compatible- uncompatible), the studied rocks indicate a linear or approximately linear trend which confirm the fractional crystallization process. The presence of mafic microgranular enclaves emphasize on the magma mingling and mixing process during the evolution of magma forming of the studied rocks. The enrichment in LILE and depletion in HFSE reveal the I-type and mextaluminous nature of the magmatism's of volcanic arcs (VAG). Discrimination diagrams of tectonic setting also indicate that the intrusion of this granitoidic pluton occurred in a volcanic arc in an active continental margin, so that with attention to geological history of this area, it can be attribute to subduction of Neo-Tethyan oceanic lithosphere below central Iran microcontinent. By consideration of the geochemical characteristic, magma forming of these rocks probably generated from partial melting of a garnet amphibolitic source rock (mextamorphed oceanic crust) in 80 to 100 km below the surface of the earth.