Geochemistry of Fluvio-Tidal Paleogene Litho-Units of Nsugbe Area, Southeastern Nigeria: Implication for Provenance, Tectonic Setting and Source Area Weathering [ ]

Rock chemistry is a function of its origin and history. The fluvio-tidal Paleogene litho-units of Nsugbe area are composed dominantly of fine to coarse, poorly to moderately sorted, subangular to subrounded, quartz-rich sands and sandstones that have a relatively high composition of SiO2, Al2O3 and Fe2O3. They are classified into lithicarenite, sublitharenite and quartzarenite with mature polycyclic continental sedimentary rocks that have imprints of plutonic and volcanic rocks from passive and active continental margins source derivation. The CIA and CIW values show that the source area has undergone intense alteration and weathering. This study consolidates and expands the knowledge of provenance and tectonic settings of Paleogene litho-units in Nsugbe area