Mineral chemistry, origin and magmatic evolution of Sarduiyeh batholith, southeast of Kerman

The Oligocene Sarduiyeh batholith with NW-SE trend is located in the southeast of the Urumieh-Dokhtar magmatic zone in the Kerman province. This batholith intruded into the Eocene volcanic rocks that comprises of andesite, andesite basalt and subordinate basalt with pyroclastics rocks. The batholith consists of acidic-intermediate rocks such as diorite, tonalite, granodiorite and monzogranite. Mineral Chemistry of plagioclase crystals indicate that their composition varies between oligoclase and andesine with An 24-43 and calcic amphibole have magnesiohornblende compositions. Field, petrological and geochemical studies show that the Sarduiyeh batholith magma is I-type, metaluminous to weakly peraluminous and its belonging to calc-alkaline series. On the primitive mantle-normalized spider diagram, all samples are enriched in large ion lithophile elements such as U, K, Pb and Sr and depleted in high field strength elements such as Ti, Ta and Nb which are characteristics of the volcanic arc setting formed in an active continental margin. Based on geochemical studies, the Sarduiyeh batholith formed as a result of partial melting from metabasic rocks of lower crust.