Morphological study of zircon crystals from gneissic granite of Abadchi, North of Zayandeh-Rud dam

Small gneissic granite body of Abadchi is a deformed, folded and metamorphosed granitoid which occurred in North of the lack of Zayandeh-Rud dam, as a part of Sanandaj-Sirjan Zone. The mineralogical composition contains quartz, plagioclase, K-feldspar, biotite, amphibole and muscovite as main minerals, as well as zircon, titanite and allanite as accessory minerals. Zircon typology of the gneissic granite body mostly introduces the fields P2. The morphology of zircon grains represents a slightly crust to mantle origin for protolith magma of the gneissic granite. According to the zircon morphology, as geothermometer, the crystallization temperature of the zircon crystals is about 750 -800 ° C.