Reconstructing the iron cycle from the horizontal distribution of metals in the sediment of Baldeggersee |
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| Authors: | Tobias Schaller H Christoph Moor Bernhard Wehrli |
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| Institution: | (1) Limnological Research Center, Swiss Federal Institute for Environmental Sciences and Technology (EAWAG) and Swiss Federal Institute of Technology (ETH), CH-6047 Kastanienbaum, Switzerland;(2) Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-8600 Dübendorf, Switzerland |
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| Abstract: | In Baldeggersee, the distributions of solid phase Fe, Mn, V, Cr, As and Mo were determined in different sediment strata, deposited
under various deep-water oxygen conditions. Iron concentrations are correlated with water depth when an anoxic sediment is
in contact with an oxic water column. Benthic redox gradients trigger iron transport towards the deepest site (geochemical
focusing) and loss of iron from the shallower parts through the outflow. Fe cycling in the lake is inhibited by oxygen penetration
into the sediment. Vanadium and arsenic can be used as tracers for the internal Fe cycle. Their distribution patterns are
highly correlated with iron. In case of a stable oxycline in the deep water, Mo is enriched in the sediment and correlates
with Mn. The horizontal distribution patterns of Fe, V, As and the correlation of Fe and Mn with trace metals are promising
proxy indicators for the reconstruction of deep-water oxygen conditions during deposition. |
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| Keywords: | Metal distribution iron cycling geochemical focusing |
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