Summary
Laboratory experiments have shown that in particular chemical and physical conditions, manganese separates from a Mn++-enriched solution of seawater in the form of colloidal micelles. These, instead of co-precipitating with the clay matrix, are repelled from it, and accumulate at the sediment solution interface. This may be an explanation of the manganese concentrations observed in nature on the seafloor towards the surface of sediment columns.
In some cases, the black magnetic spherules (B. M. S.) might act as aggregation cores for the precipitation of manganes micelles.
Zusammenfassung
Laboratoriums experimente haben gezeigt, daß sich unter besonderen chemischen und physikalischen Bedingungen Mangan aus einer Mn++-angereicherten Lösung von Meereswasser in Form von kolloidalen Micellen absondert. Diese werden, statt zusammen mit dem Lehmmaterial abzuscheiden, davon abgesondert und häufen sich in der Sedimentlösungs-zwischenschicht an. Dies kann eine Erklärung sein für die in der Natur beobachtete Mangankonzentration am Meeresboden gegen die Oberfläche von Sedimentschichten hin. In manchen Fällen können die schwarzen magnetischen Kügelchen (B. M. S.) als Anhäufungskerne für die Fällung von Mangan-Micellen wirken.
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del Monte, M., Rabbi, E. Some experimental data on the precipitation and migration of manganese on the seafloor. Arch. Met. Geoph. Biokl. A. 28, 293–299 (1979). https://doi.org/10.1007/BF02310174
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DOI: https://doi.org/10.1007/BF02310174