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Alteration of Basaltic Glass in Iceland as a Natural Analogue for Nuclear Waste Glasses: Geochemical Modelling with DISSOL

Published online by Cambridge University Press:  26 February 2011

J. L. Crovisier ,
T. Advocat ,
J. C. Petit  and
B. Fritz
J. L. Crovisier
Affiliation:
C.S.G.S. (CNRS), 1, rue Blessig 67000 Strasbourg, FRANCE
T. Advocat
Affiliation:
C.S.G.S. (CNRS), 1, rue Blessig 67000 Strasbourg, FRANCE
J. C. Petit
Affiliation:
CEA, (SESD/LECALT), CEN-FAR, B.P.6, 92265 Fontenay-aux-roses, FRANCE
B. Fritz
Affiliation:
C.S.G.S. (CNRS), 1, rue Blessig 67000 Strasbourg, FRANCE
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Abstract

The long term geochemical consequences of basaltic glass dissolution in fresh water at 0°C have been calculated with the computer code DISSOL. The clay minerals were represented by an ideal solid solution model (CISSFIT) able to describe variations in chemical composition of a clay phase in response to variations of the solution chemistry. The predicted mineral phases were iron hydroxides followed by kaolinite, TOT clays, chabazite and cli-noptilolite. These results are in reasonably good agreement with experimental results and observations of altered subglacial hyaloclastites from Iceland. The formation of secondary products are mainly controlled by thermodynamic constraints. Kinetic effects, such as diffusion in the near glass surface are not important.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 57
Copyright
Copyright © Materials Research Society 1989

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References

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