(Fig 2, page 399), Distribution of Fe and Mn in ferromanganese nodules of the Eningi-Lampi Lake, Russia

The distribution of Mn and Fe in water, sediments, hydroxide nodules and crusts of Eningi-Lampi ore-bearing lake is regular, and concordant from the source to the areas of accumulation of these components. Mn-Fe hydroxide nodules and crusts occur at the water-sediment interface, and more rarely in the upper (0-5 cm) film of brown watery mud. The leading role in the formation of Mn-Fe nodules and crusts is played by the chemosorption and auto-catalytic oxidation in the course of interaction of component-bearing solutions with active surfaces. This is considered to be the basic process for the model of ferromanganese ore formation in recent basins. Despite the differences in the physico-geographical and geochemical characteristics of lakes, mediterranean seas and oceans, the formation of ferromanganese hydroxide nodules and crusts in these basins may be explained by this model.

Annotated record of the detailed examination of Mn deposits from MIDPAC Expedition stations

The cores described in this report were taken on MIDPAC (Middle Pacific) Expedition in August-September 1950 by Scripps Institution of Oceanography from, the R/V Horizon. A total of 106 cores and dredges were recovered and are available at Scripps for sampling and study. The coring sites, all in the tropical central Pacific.

Annotated record of the detailed examination of Mn deposits from SOMIRMAS cruise stations

The cores and dredges described at this site were taken on the SOMIRMAS cruise from 5 July to 14 August 1990 by the MusÈum National d'Histoire Naturelle from the R/V Marion Dufresne. A total of 30 cores and dredges were recovered and are available at MNHN for sampling and study.