Investigating the chemical composition variations of amphiboles during deformation of basic metamorphic rocks in the northeast of Serow(west Azarbaijan).

Category Petrology
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

     The investigated area is located to the NW of Uromiah, which belongs to the Sanandaj-Sirjan structural zone. Outcrops in this region are essentially composed of metamorphic rocks. Study of basic metamorphic rocks indicates that contemporaneous metasomatism and deformation form these rocks.
This paper attempts to illustrate the chemical variations of metamorphic amphiboles with regard to host rocks and their prograde variations.
Electron micro probe analysis of the amphiboles showed that variations of the amphibole compositions include increases in A12O3 and TiO2 contents associated with decreases in MgO,
Na2O and MnO contents during mylonitization. These variations are related to the host rock chemistry, P-T conditions and oxygen fugacity.