Minerals chemistry and petrogenesis of metamorphic rocks of Anjul area, southwest of Qayen

Abstract

ABSTRACT The study area is a part of the Sistan suture zone of eastern Iran that is located in the southwest of Qayen city with a northwest-southeast extension. The studied rocks were affected by the regional metamorphism with low to high metamorphism intensity variables. This metamorphism has produced greenschist, amphibolite, and granulite facies rocks. Mineral chemistries indicate that amphiboles of the studied metamorphic rocks were magnesiohornblende and are categorized as metamorphic amphiboles. Pyroxenes are of Augite type, plagioclases are at the level of andesine to labradorite, and biotites are of types that are rich in iron. Definite chemical zoning of garnets in studied metamorphic rocks of the area is the indicator of their formation and development during increasing pressure and temperature that is evidence of Subduction and the rise of a part of the metamorphic rocks during thrust faulting in a direction opposite to that of Subduction in the study area.