Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland
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 prec...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Elsevier Science BV
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/6669 |
| _version_ | 1848745143896637440 |
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| author | Naeher, Sebastian Gilli, A. North, R. Hamann, Y. Schubert, C. |
| author_facet | Naeher, Sebastian Gilli, A. North, R. Hamann, Y. Schubert, C. |
| author_sort | Naeher, Sebastian |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T06:12:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-6669 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:12:41Z |
| publishDate | 2013 |
| publisher | Elsevier Science BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-66692017-09-13T16:02:38Z Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland Naeher, Sebastian Gilli, A. North, R. Hamann, Y. Schubert, C. Oxygen Redox Mn/Fe ratio XRF core scanning Lake Zurich Manganese 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. 2013 Journal Article http://hdl.handle.net/20.500.11937/6669 10.1016/j.chemgeo.2013.06.006 Elsevier Science BV restricted |
| spellingShingle | Oxygen Redox Mn/Fe ratio XRF core scanning Lake Zurich Manganese Naeher, Sebastian Gilli, A. North, R. Hamann, Y. Schubert, C. Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland |
| title | Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland |
| title_full | Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland |
| title_fullStr | Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland |
| title_full_unstemmed | Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland |
| title_short | Tracing bottom water oxygenation with sedimentary Mn/Fe ratios in Lake Zurich, Switzerland |
| title_sort | tracing bottom water oxygenation with sedimentary mn/fe ratios in lake zurich, switzerland |
| topic | Oxygen Redox Mn/Fe ratio XRF core scanning Lake Zurich Manganese |
| url | http://hdl.handle.net/20.500.11937/6669 |