Manganese in the shelf sediments off east coast of India

The distributional pattern of manganese in the shelf sediments off east coast of India has been determined. It is found that sediments from the immediate vicinity of river confluences, those of finer texture, and also those that are brownish in colour are generally more enriched in manganese. Manganese content decreases in a direction that is seaward from the coast and away from river confluences. An inverse relationship between the manganese content and the carbonate content of these sediments has been established, the richer the sediment in carbonate content the less the manganese concentration.