Fluctuations in the concentration of manganese in sediment cores from the Caribbean could be caused by diagenetic remobilization of manganese due to alternations below the sediment-water interface of oxidized and reduced layers. The occurrence of oxidized and reduced layers is ascribed
ultimately to Pleistocene climatic fluctuations. Data on the distribution of N, Mn, Fe, Ni, and Co in a Caribbean core are presented in support of this hypothesis.
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