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Mossbauer spectroscopic investigations of deep-sea sediments from the Peru Basin revealed a prominent downcore increase of the bulk sediment Fe(II)/Fe(III) ratio across the well-known tan-green color transition. Remarkably constant values of the Fe(II)/Fe(III) ratios above and below the iron redox transition-zone delimit the gradient clearly. A minor peak of diagenetic iron enrichment is manifest at the redox front. This Fe enrichment has accumulated in a redox cycle and amounts to 16±4% of the total Fe at the peak maximum. The data imply that 26±4% of the detrital iron has experienced in situ redox transition from Fe(III) to Fe(II) within the iron redox transition-zone.