Petro genesis of highly fractioned I- type per aluminous granites, Eastern Rafsanjan

The Kuh Gabbri granitoide stocks stands out as the most extensively fractioned granite (Rb= 424-749, Sr= 8-37, Ba= 3-110 ppm) located in the Rafsanjan depression and Urumieh- Dokhtar belt. These granites show a strong enrichment in some rare metal contents such as Y, Yb, U, Ta, and Sc. The petrography and geochemistry reveal that these are classified as I- type per aluminous leucogranite, P- poor (P2O5= 0.01 0.03%) and Na2O- rich (3.1-4%).The Gabbri granites show chemical features convergent to A- type granite; these are explained by extensive fractional crystallization of a P-poor, I- type granite magma. These are located in the area of within plate granite and extensional area. The petrography and geochemistry show Gabbri granite are produced of melting continental crust.