Geochemistry and detrital geochronology of sandstones of Barail Group of Indo-Myanmar Range, NE India

Abstract

The sedimentary sequence of Barail Group preserves the records of depositional history of Indo-Myanmar Range during Eocene-Oligocene. Field investigation, geochemistry and detrital geochronology are used to study its geochemical characteristics, sediment provenance and tectonic setting. Major elements based discrimination plots indicate sediments of this group are derived from quartzose sedimentary sources and deposited in a passive margin tectonic set-up.Barail sandstone display a gentle sloping LREE and more or less at HREE pattern, and show negative Eu anomaly and positive Sm anomaly. Detrital zircon U-