A geochemical profile in the Baltic Sea

Physics

Scientific paper

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Scientific paper

An investigation has been made of the relationship between depositional environment and element distribution in sediments from the Baltic Sea. A prominent feature of the Baltic is its salinity stratification, which gives rise to changes in bottom character from oxygenation to stagnation as greater depths are approached. Maximum heavy metal concentrations were not found in the contral, most stagnant and organic-rich parts of the basins, but in the transition zone to stagnant conditions. Manganese-iron nodules were found in a peripheral area characterized by aerated bottom water but moderately reducing sediment environment, as measured by redox potential determinations. In two of the Baltic deeps manganese was found enriched in sapropelic sediments, in one case reaching 5.2 per cent MnO. The mineral responsible for the enrichment is regarded as a mixed manganese-calcium carbonate.

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