Introducing the Ghorveh fibrolites and their formation condition

The metamorphic rocks of the Ghorveh area, southeast of Sanandaj, are classified as a part of the Sanandaj-Sirjan metamorphic zone. South of Ghorveh includes an assemblage of regional and contact metamorphic rocks as a result of intrusion of igneous plutons. Different types of metamorphic rocks are produced in this regard. Metapelites have two generations of andalusite, cordierite and garnet produced by two distinct contacts metamorphism. Fibrolites are associated with andalusite, garnet, biotite and muscovite near Sartip Abad intrusion. Fibrolite growth without deformation and randomly on biotite and andalusite shows that fibrolites have formed at the latest stage of intrusion phase in this area. The textural studies of fibrolites show that they are of disharmonious type. Thermobarometry shows pressure and temperature lower than 3 Kb and 700°C in KMASH sub-system, respectively. Some textural evidence are consistent with continuation of fibrolite growth after ductile deformation.