Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland

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• 作者：Sebastian Naeher ; Adrian Gilli ; Ryan P. North ; Yvonne Hamann ; Carsten J. Schubert
• 关键词：Mn/Fe ratio ; Manganese ; Oxygen ; Redox ; XRF core scanning ; Lake Zurich
• 刊名：Chemical Geology
• 出版年：2013
• 出版时间：16 August, 2013
• 年：2013
• 卷：352
• 期：Complete
• 页码：125-133
• 全文大小：2127 K

文摘

Redox dynamics of manganese (Mn) were studied in the sediment of Lake Zurich using precise sediment core age models, monthly long-term oxygen (O₂) monitoring data of the water column (1936-2010) and high-resolution XRF core scanning. The age models were based on bi-annual lamination and calcite precipitation cycles. If present, Mn exhibits distinct maxima, which coincide with the annual maximum deep-water O₂ concentrations in spring according to the monitoring data. In contrast, the iron (Fe) signal is mainly the result of calcite dilution, as indicated by a strong negative correlation between Fe and calcium (Ca) XRF data. The Mn/Fe ratio in the core from the maximum lake depth (ZH10-15, 137 m) revealed a moderate correlation with O₂ measurements in the lake bottom water confirming the successful application of the Mn/Fe ratio to semi-quantitatively reconstruct bottom water oxygenation in the lake. Mostly low ratios were observed between 1895 and the mid-1960s as a result of eutrophication. However, geochemical focusing and sedimentological factors can reduce the applicability of the Mn/Fe ratio in reconstructing O₂ concentrations in the bottom water of lakes.