. The Earth beneath the sea : History . Fig. 6. Regional variation in chemical composition of manganese nodules. Regions marked A are characterized by ratios Mn/Fe less than 1; B-areas conversely have exceptionally high ratios Mn/Fe (ranging from 12 to 50). In areas marked C the nickel and copper content of the nodules is unusually high. D denotes regions with large amounts of cobalt () in the nodules. (Mero, unpublished, modified from Mero, 1960a.) in copper and nickel content of the nodules are controlled by the process referred to above. Arrhenius and Korkisch (1959) have attempted
. The Earth beneath the sea : History . Fig. 6. Regional variation in chemical composition of manganese nodules. Regions marked A are characterized by ratios Mn/Fe less than 1; B-areas conversely have exceptionally high ratios Mn/Fe (ranging from 12 to 50). In areas marked C the nickel and copper content of the nodules is unusually high. D denotes regions with large amounts of cobalt () in the nodules. (Mero, unpublished, modified from Mero, 1960a.) in copper and nickel content of the nodules are controlled by the process referred to above. Arrhenius and Korkisch (1959) have attempted to separate from each other the different minerals constituting the nodules, in order to establish the details of their structure and the localization of the heavy metal ions. The results demonstrate (Table II) that copper and nickel are concentrated in the man- ganese oxide phases. Cobalt, part of the nickel and most of the chromium are distributed between these and the acid-soluble group of the non-manganese
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