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

    Access Status
    Fulltext not available
    Authors
    Naeher, Sebastian
    Gilli, A.
    North, R.
    Hamann, Y.
    Schubert, C.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Naeher, S. and Gilli, A. and North, R. and Hamann, Y. and Schubert, C. 2013. Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland. Chemical Geology. 352: pp. 125-133.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2013.06.006
    ISSN
    0009-2541
    URI
    http://hdl.handle.net/20.500.11937/6669
    Collection
    • Curtin Research Publications
    Abstract

    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.

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