Structural Geometry and the Time-Relation of Metamorphic Recrystallization to Deformation in the Precambrian Rocks near Simulpal, Eastern India

Three phases of deformation are recognized in the Simulpal area. The regional schistosity which was hitherto regarded as the earliest deformation structure in Singhbhum is shown to be a second generation structure preceded by a phase of isoclinal folding. The presence of a first generation easterly closing synclinorium, possibly complementary to the Singhbhum anticlinorium, is suggested. The main peak of regional metamorphism was attained after the second deformation and the earliest deformation was accompanied by only a low grade of metamorphism.