Petrographical, micro-structural and metamorphic characteristics of the Parsoi rocks, Mahakoshal Group, Sonbhadra district, Uttar Pradesh

Abstract

The low grade metamorphic rocks of the Precambrian Parsoi Formation of the Mahakoshal Group exhibit a variety of microstructures even under the thin section due to multiple deformational episodes which the area has experienced. The original petrographical characters of the rocks have been modified significantly due to these deformational and metamorphic episodes. The petrographical characters observed in the field and under the microscope have been discussed along with the microstructural features. Evidences of ductile, brittle-ductile and brittle deformation can be observed easily in these rocks. The rocks also show the evidences of regional, contact and cataclastic metamorphisms.