The chemistry of some minerals from the Shir-Kuh granitoid batholith, South-west of Yazd

The S-type granitoid batholith of Shir-Kuh, which is part of central Iran Zone, is located in SW of Yazd and consists of three main granodioritic, monzogranitic and leucogranitic units. The systematic changes in the composition of plagioclase reveal that the granodiorite have been a calcic core plagioclase-rich magma, the monzogranites is a differentiated melt, and the leucogranite is a late residual melt. Totally, all biotites have high AlVI (3.2 to 6.2 apfu) which is characteristic of peraluminous granites. The high almandine component of garnet is similar to those in other peraluminous plutons and, in particular, to the magmatic garnets. Muscovite appears as both primary and secondary-looking grains. Monazite occurs as two types of chemically crystals: monazite and brabantite [CaTh (PO4)2]. The observed homogeneous grains of Th and U poor monazite and tiny microcrystals of brabantite inside the apatite indicate dissolution of apatite during anatexis of sedimentary-metamorphic rocks. Little hematite (less than 10%) composition, which included within restitic biotite ± silimanite assemblages consistent with the idea that the Shir-Kuh granite is generated from the sedimentary source materials contained graphite. Considering the mineral assemblages, presented in the batholith, the fact that some biotites may represent restite and the mean temperature of 820°C is in agreement with the saturation thermometry; such liquids may have formed at a temperature 750 to 850°C by dehydration melting of biotite.