DISTINGUISHING FLUVIO-MARINE ENVIRONMENTS IN THE NILE DELTA USING HEAVY MINERALS

This study distinguishes fluvio-marine environments in the Nile delta of Egypt by evaluating quantitatively the heavy mineral composition of 170 samples. These environments include: fluvial (river overbank), la goon, coastal dune, accretion ridge, beach, nearshore and prodelta. To differentiate between these environments, the raw number percentage o f heavy minerals was evaluated with computer-generated bivariate plots . Evaluation of these plots exhibits satisfactory discriminations betw een most of the examined environments, particularly those which are ge ographically closed. This differentiation is interpreted in the light of sediment provenance, selective sorting by dynamic factors and natur e of the transport agent. As a test of the applicability of these resu lts, the depositional paleo-environment of ''unknown'' core samples is satisfactorily determined using the previously evaluated plots. The r esults show the potential effectiveness of heavy minerals for making e nvironmental discriminations.