Magnesium-Iron Replacement in Clay Minerals in Anoxic Marine Sediments

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Science  25 Jun 1971:
Vol. 172, Issue 3990, pp. 1334-1336
DOI: 10.1126/science.172.3990.1334


In anoxic marine sediments iron is extracted from clay minerals to form a sulfide. Magnesium from the surrounding solution then replaces the extracted iron in the clay mineral structure. This process removes magnesium from seawater and serves as a control on the composition of interstitial waters in sediments.