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

Subject Areas :

زهرا  Abedpour ¹ (گروه زمینشناسی، دانشگاه آزاد اسلامی، واحد بندرعباس، بندرعباس)
S.M.H  Emami ² (دانشیار، دانشگاه آزاد اسلامی، واحد اسلامشهر)
جمال  Seedtarah ³ (گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد بندرعباس، بندرعباس، ایران)
الهام  SHahhoseini ⁴ (گروه زمینشناسی، دانشگاه آزاد اسلامی، واحد تهران شمال، تهران، ایران)

Received: 2016-09-07 Accepted : 2016-09-07 Published : 2012-12-21

Keywords: Rafsanjan, peraluminous, A and I granite, Crustal melting,

Abstract :

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 strongenrichment in some rare metal contents such as Y, Yb, U, Ta, and Sc. The petrography and geochemistry revealthat 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 byextensive fractional crystallization of a P-poor, I- type granite magma. These are located in the area of withinplate granite and extensional area. The petrography and geochemistry show Gabbri granite are produced ofmelting continental crust