Natural U occurrences as a palaeo-hydrogeological indicator — observations from the Palmottu natural analogue site, Finland

  • Urho J. Suksi
  • Kari Rasilainen
  • Timo Ruskeeniemi
  • Nuria Marcos
  • Karl-Heinz Hellmuth
Conference paper


Use of natural U in studying recharge of oxygenated waters in crystalline bedrock is discussed. Uranium is a redox-sensitive element and therefore easily mobilised when conditions change from reducing to oxidising. It has two independent decay chains and occurs easily accessible to groundwater in the bedrock, thus forming a sensitive network of “probes”. Glacial melt waters rich in dissolved oxygen may penetrate the bedrock, producing signals in the U network along and around the flow routes. The signals record U behaviour as U-series disequilibria that are detectable long after the forming of the signal. Relative roles of modern groundwater flow and glacial melt waters as forming these signals are considered.


Dissolve Oxygen Groundwater Flow Radioactive Waste Rock Matrix Term Storage 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Urho J. Suksi
    • 1
  • Kari Rasilainen
    • 2
  • Timo Ruskeeniemi
    • 3
  • Nuria Marcos
    • 4
  • Karl-Heinz Hellmuth
    • 5
  1. 1.Laboratory of RadiochemistryUniversity of HelsinkiFinland
  2. 2.2VTT ProcessesEspooFinland
  3. 3.Geological Survey of FinlandEspooFinland
  4. 4.Helsinki University of TechnologyFinland
  5. 5.Radiation and Nuclear Safety Authority FinlandHelsinkiFinland

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