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@ARTICLE{Vuillemin:878633,
      author       = {Vuillemin, Aurèle and Friese, André and Wirth, Richard
                      and Schuessler, Jan A. and Schleicher, Anja M. and Kemnitz,
                      Helga and Lücke, Andreas and Bauer, Kohen W. and
                      Nomosatryo, Sulung and von Blanckenburg, Friedhelm and
                      Simister, Rachel and Ordoñez, Luis G. and Ariztegui, Daniel
                      and Henny, Cynthia and Russell, James M. and Bijaksana,
                      Satria and Vogel, Hendrik and Crowe, Sean A. and Kallmeyer,
                      Jens},
      title        = {{V}ivianite formation in ferruginous sediments from {L}ake
                      {T}owuti, {I}ndonesia},
      journal      = {Biogeosciences},
      volume       = {17},
      number       = {7},
      issn         = {1726-4189},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {FZJ-2020-02964},
      pages        = {1955 - 1973},
      year         = {2020},
      abstract     = {Ferruginous lacustrine systems, such as Lake Towuti,
                      Indonesia, are characterized by a specific type of
                      phosphorus cycling in which hydrous ferric iron
                      (oxyhydr)oxides trap and precipitate phosphorus to the
                      sediment, which reduces its bioavailability in the water
                      column and thereby restricts primary production. The oceans
                      were also ferruginous during the Archean, thus understanding
                      the dynamics of phosphorus in modern-day ferruginous
                      analogues may shed light on the marine biogeochemical
                      cycling that dominated much of Earth's history. Here we
                      report the presence of large crystals (>5 mm) and nodules
                      (>5 cm) of vivianite – a ferrous iron phosphate – in
                      sediment cores from Lake Towuti and address the processes of
                      vivianite formation, phosphorus retention by iron and the
                      related mineral transformations during early diagenesis in
                      ferruginous sediments.Core scan imaging, together with
                      analyses of bulk sediment and pore water geochemistry,
                      document a 30 m long interval consisting of sideritic and
                      non-sideritic clayey beds and diatomaceous oozes containing
                      vivianites. High-resolution imaging of vivianite revealed
                      continuous growth of crystals from tabular to rosette habits
                      that eventually form large (up to 7 cm) vivianite nodules
                      in the sediment. Mineral inclusions like millerite and
                      siderite reflect diagenetic mineral formation antecedent to
                      the one of vivianite that is related to microbial reduction
                      of iron and sulfate. Together with the pore water profiles,
                      these data suggest that the precipitation of millerite,
                      siderite and vivianite in soft ferruginous sediments stems
                      from the progressive consumption of dissolved terminal
                      electron acceptors and the typical evolution of pore water
                      geochemistry during diagenesis. Based on solute
                      concentrations and modeled mineral saturation indices, we
                      inferred vivianite formation to initiate around 20 m depth
                      in the sediment. Negative δ56Fe values of vivianite
                      indicated incorporation of kinetically fractionated light
                      Fe2+ into the crystals, likely derived from active reduction
                      and dissolution of ferric oxides and transient ferrous
                      phases during early diagenesis. The size and growth history
                      of the nodules indicate that, after formation, continued
                      growth of vivianite crystals constitutes a sink for P during
                      burial, resulting in long-term P sequestration in
                      ferruginous sediment.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000526054000001},
      doi          = {10.5194/bg-17-1955-2020},
      url          = {https://juser.fz-juelich.de/record/878633},
}