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

Abstract

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.

Keywords

Permeability Migration Europe Uranium Calcite 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Blomqvist, R., Ahonen, L. and Hakkarainen, V., 1989. Alustava hydrogeologinen tulkinta Outokummun Sukkulansalon alueesta. Abstract: Preliminary hydrogeological interpretation of deep groundwater in the Outokumpu area. Geological Survey of Finland, Nuclear Waste Disposal Research. Report YST-67. 47 p. + 15 app.Google Scholar
  2. Blomqvist, R., Kaija, J., Lampinen, P., Paananen, M, Ruskeeniemi, T., Korkealaakso, J., Pitkanen, P., Ludvigson, J-E., Smellie, J. T. A., Koskinen, L., Floría, E., Turrero, M. J., Galarza, G., Jakobsson, K., Laaksoharju, M., Casanova, J., Grundfelt, B. and Hernan, P., 1998. The Palmottu natural Analogue Project - Phase 1: Hydrogeological evolution of the site. European Commission, Report EUR 18202, 95 p. + 1 Appendix.Google Scholar
  3. Blomqvist, R., Ruskeeniemi, T., Kaija, J., Ahonen, L., Paananen, M., Smellie, J., Grundfelt, B., Pedersen, K., Bruno, J., Perez del Villar, L., Cera, E., Rasilainen, K., Pitkänen, P., Suksi, J., Casanova, J., Read, D. & Frape, S. 2000. The Palmottu natural analogue project - Phase II: Transport of radionuclides in a natural flow system at Palmottu. Luxembourg: European Commission. 174 s. (Nuclear Science and Technology Series EUR 19611 EN.)Google Scholar
  4. Boulton, G.S., Kautsky, U. and Wallroth, T., 2001. Impact of long-term climate change on deep geological repository for spent nuclear fuel. SKB Technical Report TR-99-05. Swedis Nuclear Fuel and Waste Management Co., 117 p.Google Scholar
  5. Ivanovich, M. and Harmon, R.S., 1992. Uranium-series disequilibrium, applications to earth, marine, and environmental sciences, Clarendon Press, Oxford (2nd ed.), 910 p.Google Scholar
  6. Langmuir, D., 1978. Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposit. Geochim. Cosmochim. Acta 42, 547-569.Google Scholar
  7. Langmuir, D. and Herman, J.S., 1980. The mobility of thorium in natural waters at low temperatures. Geochim. Cosmochim. Acta 44,1753-1766.Google Scholar
  8. Guimerà, J., Duro, L., Jordana, S. & Bruno, J. 1999. Effects of ice melting and redox front migration in fractured rocks of low permeability, Stockholm: Swedish Nuclear Fuel and Waste Management Co. 86 p. (Technical Report TR-99-19.)Google Scholar
  9. Rasilainen, K., Suksi, J., Ruskeeniemi, T., Pitkänen, P., and Poteri, A., 2002. Release of U from rock matrix - A record of glacial melt water intrusions? J. Contamin. Hydrol. (in print).Google Scholar
  10. Rasilainen, K. (ed.) 2002. Nuclear waste management in Finland - Final report of Public Sector’s Research Programme JYT2001 (1997-2001). 258 p. Ministry of Trade and Industry Studies and Reports 15/2002, 258 p.Google Scholar
  11. Suksi, J., Rasilainen, K., Casanova, J., Ruskeeniemi, T., Blomqvist, R. and Smellie, J.A.T., 2000. U-series disequilibria in a groundwater flow route as an indicator of uranium migration processes. J. Contamin. Hydrol. 47/2-4, 187-196.CrossRefGoogle Scholar
  12. Stuckless, J.S. and Pires Ferreira, C., 1976. Labile uranium in granitic rocks. Exploration for uranium ore deposits. Proceedings of a symposium on exploration of uranium ore deposit, 29 March - 2 April 1976, Vienna. IAEA-SM-208/17, 717-729.Google Scholar

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

Personalised recommendations