Petrography, Mineralogy and Mineralchemistry of Ochestan contact metamorphic rocks (South of Mahallat)

The skarns of the Ochestan area are located in the Sanandaj- Sirjan zone، about 60 Km south of Mahallat. The rock complex in this area consist of intrusive bodies and metamorphic rock such as: schist، phyllite، slate، hornfels، amphibolite and metavolcanic. The injection of magma in the Cretaceous-Paleocene with syenogranite and monzogranite composition into the Paleozoic limestone and dolomite led to formation of skarn and marble. Clinopyroxene (diopside)، olivine (forsterite)، tremolite، talc، serpentine، phlogopite، margarite، wollastonite، opaque minerals، calcite and quartz are observed minerals in contact metamorphism rocks. According to the mineralogical studies، the Ochestan skarns are exoskarn-type and the presence of minerals such as: forsterite، diopside، tremolite، antigorite and phlogopite show that the host rock is dolomitic the in study area. These skarns show zoning of intrusive body into the host rock: wollastonite skarn، pyroxene skarn، forsterite- serpentine marbles، mica marbles، tremolite- talc marbles، calcite and dolomite marbles.