Distribution of Calcium Carbonate in the Sediments of the Visakhapatnam Shelf, Central East Coast of India

The distribution of calcium carbonate in Visakhapatnam shelf sediments is controlled by the mollusca shells and shell fragments and foraminifera. The high concentrations near the river mouths are indicative of the detrital contribution also. The concentrations decrease from top to sub-bottom levels due to more dilution by the detritus from the adjoining area and less deposition of non-detrital calcium carbonate in the geological past.