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Uranium Mineral – Groundwater Equilibration at the Palmottu Natural Analogue Study Site, Finland

Published online by Cambridge University Press:  01 January 1992

Lasse Ahonen ,
H. Ervanne ,
T. Ruskeeniemi ,
T. Jaakkola  and
R. Blomqvist
Lasse Ahonen
Affiliation:
Geological Survey of Finland, SF-02150 ESPOO, Finland
H. Ervanne
Affiliation:
University of Helsinki, Department of Radiochemistry, SF-00170 Helsinki, Finland
T. Ruskeeniemi
Affiliation:
Geological Survey of Finland, SF-02150 ESPOO, Finland
T. Jaakkola
Affiliation:
University of Helsinki, Department of Radiochemistry, SF-00170 Helsinki, Finland
R. Blomqvist
Affiliation:
Geological Survey of Finland, SF-02150 ESPOO, Finland
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Abstract

The redox-potential, pH, chemical composition of fracture waters, and uraninite alteration associated with the Palmottu uranium mineralization, have been studied. The data have been interpreted by means of thermodynamic calculations. The results indicate equilibrium between uraninite, ferric hydroxide and groundwater in the bedrock of the study site. Partially oxidized uraninite (UO2.33) and ferric hydroxide are in equilibrium with the fresh, slightly acidic and oxidized water type, while primary uraninite is stable with deeper waters that have a higher pH and lower Eh. Measured Eh-pH values of groundwater cluster within a relatively narrow range indicating buffering by heterogenous redox-processes. A good consistency between measured Eh and analyzed uranium oxidation states was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 497
Copyright
Copyright © Materials Research Society 1993

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