Fluid regime during metamorphic evolution of the eastern fringe of the Bastar Craton adjoining the Singhbhum Craton and the Eastern Ghats Belt, India

In the northeastern part of peninsular India, a triangular domain of the Bastar craton is effectively sandwiched between the Eastern Ghats Mobile Belt (EGMB) in the south and the Rengali Province and Singhbhum craton in the north (Fig.1). Figure 1. Rectangle in map shows the study area The geological evolution of this domain is expected to preserve imprints of the amalgamation history of all three Precambrian terrains. This cratonic domain comprises a variety of quartzofeldspathic gneisses (QFG) such as augen gneiss, granitic/granodioritic gneisses along with some leptynites and garnet-biotite schists, enderbites/ charnockites, mafic granulites and amphibolite dykes and sills. These lithologies (except amphibolite) preserve a record of early granulite facies metamorphism. This early granulite fabric is represented as