Manganese and Biotic Debris Associations in Some Deep-Sea Sediments

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Science  08 Nov 1974:
Vol. 186, Issue 4163, pp. 529-531
DOI: 10.1126/science.186.4163.529


Incipient manganese concretions occur in microcavities of planktonic skeletal debris (especially diatom frustules) in some Pacific Basin deep-sea sediments. These concretions contain over 50 percent manganese and very little iron (< 1 percent). There is a continuum of growth stages in the concretions having a diameter between 0 and approximately 2 millimeters, and a genetic relationship is suggested between the very small and the centimeter sized concretions.