The S-type granitoidic batholith of Shir-Kuh consists of three main granodioritic, monzogranitic and leucogranitic units. The separation of restite crystals from the primary melt, followed by the fractional crystallization, appears to have been an effective differentiation process in the batholith. Small biotite assemblages with higher XMg relative to host flaky biotites, surmicaceous enclaves,...
