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1000 Titel
  • Geochemical focusing and sequestration of manganese during eutrophication of Lake Stechlin (NE Germany)
1000 Autor/in
  1. Scholtysik, Grzegorz |
  2. Dellwig, Olaf |
  3. Roeser, Patricia |
  4. Arz, Helge Wolfgang |
  5. Casper, Peter |
  6. Herzog, Christiane |
  7. Goldhammer, Tobias |
  8. Hupfer, Michael |
1000 Erscheinungsjahr 2020
1000 LeibnizOpen
1000 Publikationstyp
  1. Artikel |
1000 Online veröffentlicht
  • 2020-11-24
1000 Erschienen in
1000 Quellenangabe
  • 151(2-3):313-334
1000 FRL-Sammlung
1000 Copyrightjahr
  • 2020
1000 Lizenz
1000 Verlagsversion
  • https://doi.org/10.1007/s10533-020-00729-9 |
1000 Publikationsstatus
1000 Sprache der Publikation
1000 Abstract/Summary
  • Significant sedimentation of manganese (Mn) in form of manganese oxides (MnOₓ) and the subsequent formation of authigenic calcium-rich rhodochrosite (Mn(Ca)CO₃) were observed in the seasonally stratified hard water Lake Stechlin in north-eastern Germany. This manganese enrichment was assumed to be associated with recent eutrophication of the formerly oligotrophic lake. The mechanisms and processes involved were examined by analysing: (i) short sediment cores obtained from seven locations along a depth transect ranging from 69.5 m (the deepest point) to 38 m; (ii) sediment traps located at 20 m and 60 m water depths; (iii) water column profiles; and (iv) porewater profiles at 69.5 m and 58 m depths. Sedimentary Mn enrichment was observed at water depths below 56 m and increased to more than 25 wt% at the deepest site. Between 2010 and 2017, Mn accumulation at the deepest site was 815 g Mn m⁻². Transfer of Mn from the shallower towards the deepest parts of the lake was initiated by reductive dissolution of MnOₓ and diffusion of dissolved Mn from the sediment to the overlying water column. Manganese was then dissipated via turbulent mixing and subsequently oxidised to MnOₓ before being transported towards the deepest zone. Transformation of the redeposited MnOₓ to Mn(Ca)CO₃ favoured the final burial of Mn. We show that eutrophication and the areal spreading of anoxic conditions may intensify diagenetic processes and cause the spatial redistribution of Mn as well as its effective burial. Contrary to many previous findings, we show that increases of Mn and Mn/Fe can also be used as indicators for increasing anoxic conditions in previously oligotrophic lakes.
1000 Sacherschließung
lokal Eutrophication
lokal Article
lokal Lacustrine sediments
lokal Rhodochrosite
lokal Varves
lokal Diagenesis
lokal Geochemical focusing
1000 Liste der Beteiligten
  1. https://orcid.org/0000-0002-8311-0795|https://orcid.org/0000-0002-0028-8812|https://orcid.org/0000-0002-5604-1827|https://orcid.org/0000-0002-1997-1718|https://orcid.org/0000-0002-5956-4674|https://frl.publisso.de/adhoc/uri/SGVyem9nLCBDaHJpc3RpYW5l|https://orcid.org/0000-0001-8897-4659|https://orcid.org/0000-0002-8878-1045
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1000 Erstellt am 2023-11-18T08:06:29.929+0100
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