Study cause of tertrad effect in REE pattern in Misho A-type granitoides Complex, NW of Iran

A-Type granitoides of the East Misho, are per-aluminous to sub-aluminous rocks that formed by partial melting of lower crustal rocks. Their essential composed of quartz, K-Feldspar, plagioclase, amphibole and biotite and accessory minerals including alanite, zircon, apatite and Fe-oxide. REE normalize conderite pattern of the granitoids show the M-type tetrad effect and strong Eu depletion. All of petrographic and geochemical data show that both fractionation and crystallization REE-rich minerals and reaction of magma- fluids in late crystallization phenomena are the most important factors for tetrad effect formation in misho granitoides.