Abstract
The lateral distributions of Mn concentrations in the sediments of two Swiss lakes under varying oxygen conditions have been determined. The comparison of Mn distribution patterns with oxygen in the deep-water provides strong evidence for a geochemical-focusing effect, which is driven by the redox cycle of manganese. Conditions essential for this process to occur are anoxic sediments in contact with oxic deep-water. Average sedimentary manganese concentrations determined for different water-depth ranges are directly proportional to the area of shallower sediments. This result indicates that geochemical-focusing of manganese in lake sediments is a promising proxy indicator for the reconstruction of oxygen conditions during deposition.
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Schaller, T., Wehrli, B. Geochemical-focusing of manganese in lake sediments — An indicator of deep-water oxygen conditions. Aquat Geochem 2, 359–378 (1996). https://doi.org/10.1007/BF00115977
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DOI: https://doi.org/10.1007/BF00115977