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@ARTICLE{Magnsson:878634,
      author       = {Magnússon, Rúna and Cammeraat, Erik and Lücke, Andreas
                      and Jansen, Boris and Zimmer, Anaïs and Recharte, Jorge},
      title        = {{I}nfluence of glacial sediments on the chemical quality of
                      surface water in the {U}lta valley, {C}ordillera {B}lanca,
                      {P}eru},
      journal      = {Journal of hydrology},
      volume       = {587},
      issn         = {0022-1694},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2020-02965},
      pages        = {125027 -},
      year         = {2020},
      abstract     = {The Río Santa (Ancash, Peru) and its tributaries are an
                      essential source of drinking and irrigation water. Its
                      discharge relies on glacial meltwater, which is diminishing
                      due to the rapid decrease in glacial extent. As a secondary
                      effect, water quality can be compromised (e.g. pH < 3 and
                      high concentrations of SO42− and trace metals). Although
                      this has previously been attributed to pyrite rich Chicama
                      bedrock exposed by glacial retreat, little is known about
                      the occurrence of Chicama fragments in Quaternary glacial
                      sediments and its influence on water quality. This research
                      aims at elucidating this effect by relating observed changes
                      in water quality in streams to presence and chemical
                      composition of morainic ridges in the Quebrada Ulta in the
                      Río Santa basin. Changes in water quality before and after
                      contact with a morainic ridge were assessed using carbonate
                      alkalinity titration, ion analysis and elemental analysis.
                      Moreover, relative contributions of glacial meltwater and
                      precipitation were assessed qualitatively using stable water
                      isotope analysis. We used a novel method to explain the
                      provenance of contaminated glacial sediments using a
                      reconstruction of their source area. The mineralogical
                      composition of a morainic ridge was strongly related to the
                      geology of the source area indicating that mineralogical
                      composition of tills may be predicted using this technique.
                      Effects of glacial sediments in morainic ridges on water
                      quality were minimal but depended on their mineralogical
                      composition. Morainic ridges with a high content of Chicama
                      shales tended to increase solute loads of Mg and SO42−.
                      Additionally, isotope signatures suggest that during the dry
                      season, moraines may act as reservoirs for
                      precipitation-derived shallow groundwater. Clear trends in
                      water quality were observed along the whole flow path of the
                      Río Buín, which could potentially be explained by
                      increased groundwater contribution downstream and shifts in
                      dominant weathering mechanisms. Future research should focus
                      on disentangling these various drivers of water quality in
                      glacial catchments.},
      cin          = {IBG-3},
      ddc          = {690},
      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:000568819100023},
      doi          = {10.1016/j.jhydrol.2020.125027},
      url          = {https://juser.fz-juelich.de/record/878634},
}