Petrography, geochemistry and petrogenesis of the Daraloo granitoid rocks, south of Kerman

The Daraloo ore deposit area, structurally located in the Central Iran and Urumieh Dokhtar magmatic belt, is situated in the south of Kerman Province. In this region, Eocene andesitic flows and pyroclastic rocks have been invaded by Oligo-Miocene hypabyssal intrusive bodies. Most of the intrusive samples are granodiorite porphyry to monzogranite porphyry with a microgranular groundmass and affected by severe phyllic alteration. Mineralogical and geochemical evidence show that Daraloo granitic rocks are calc-alkaline, metaluminous to slightly peraluminous and I-type in nature. Clear negative Nb-Ti anomalies in most samples can be explained by the fractionation of titanium-containing phases such as titanite and titanomagnetite. Also, obvious enrichment in the large ion lithophile elements (LILEs such as K, Rb, Ba and Cs) and light rare earth elements (LREEs) compared to high field strength elements (HFSEs such as Ta, Nb, Ti and Zr) and heavy rare earth elements (HREEs), all clearly show a geochemical feature of magmas generated in subduction environments. So, it can be concluded that Daraloo granitic rocks must be formed in an active continental margin environment as a result of subduction of the Neotethys oceanic crust beneath the Central Iranian microcontinent during the Tertiary time.