Superposed folding, transposed fabric growth in granulite facies condition: Implications for possible hiatus in structural history in a granulite complex of the Eastern Ghats belt, India

The granulite complex around Jenapore, Orissa bears the imprints of three deformations, of which first two (D(1) and D(2)) are strong events and related to pervasive deformational fabrics S(1) and S(2) respectively. Sector-wise structural analyses reveal that regional F(1) folds, product of D(1) deformation, are isoclinal, reclined, while the regional F(2) folds, product of D(2) deformation, are upright with overall gentle easterly plunges. Also, the polyclinal and non-cylindrical nature of regional F(2) prior to F(3) folding is evident. This geometrical relation and certain key features such as (1) transposition / cross-cutting of early deformation fabric by later ones; (2) different modes of recrystallization during separate deformation episodes; (3) distinct deformational regime and response of materials related to deformation fabrics and (4) recrystallization of early fabric to a new one under granulite facies condition, definitely indicate a hiatus between D(1) and D(2) deformations.