Geochemistry of Shales of Barail group Occurring in and around Mandardisa, North Cachar Hills, Assam; India: Its Implications

摘要

Geochemical studies of shale samples from Barail Group occurring in and around Mandardisa, North Cachar hills, Assam have been carried out The major, minor and trace elements present in the shale samples show significant results in determining provenance and source rock composition, tectonic setting, palaeoweathering, chemical maturity and palaeoclimate. The different bivariate plots suggest their derivation from felsic source rock of granitic dominated upper continental crust. In the CaO-K20-Na2O ternary plot of the shale samples fall in active continental margin. The CIA values indicate moderate to high degree of chemical weathering. The shales of the studied area show increasing chemical maturity under humid climatic condition.