Kharazmi Journal of Earth Sciences

The Ebrahim-Attar granitoid body is located in southwest of the Ghorveh, northwest Iran. These rocks mainly show granular, pegmatitic, graphic and perthite textures. The main minerals are Quartz, alkali feldspar, plagioclase, biotite, muscovite and some Accessory minerals such as beryl and garnet. These rocks have classified as two mica granite, with peraluminous to strongly peraluminous compositional. REE Chondrite normalized pattern, show the strong negative anomalies of Eu and tetrad effect. M-type tetrad effects are clear in these rocks as a geochemical indicator of the final stages of inetracion fluid and melts during the magma crytsallizationd. Relationship of tetrad effects with trace elements ratios confirm this process was occurred during the evolution of granitic magma. Generally, behavior of trace elements and geochemical twins indicates the difference between the Ebrahim-Attar with the common granites in Groveh area. Trace elements ratios, especially geochemical twins, represents non-CHARAC behavior for these elements for these rocks, and it may be related to the F-rich like fluid interaction with melt in the final stage of magma crystallization.