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A New Insight into the Nature of the Leached Layers Formed on Basaltic Glasses in Relation to the Choice of Constraints for Long Term Modelling

Published online by Cambridge University Press:  26 February 2011

J. L. Crovisier ,
H. Atassi ,
V. Daux ,
J. Honnorez ,
J. C. Petit  and
J. P. Eberhart
J. L. Crovisier
Affiliation:
C.S.G.S. (CNRS), 1, rue Blessig 67000 Strasbourg, FRANCE
H. Atassi
Affiliation:
Univ. Louis Pasteur, Lab. de Cristallographie, Minéralogie et Pétrographie, 1, rue Blessig, 67000 Strasbourg, FRANCE
V. Daux
Affiliation:
C.S.G.S. (CNRS), 1, rue Blessig 67000 Strasbourg, FRANCE
J. Honnorez
Affiliation:
C.S.G.S. (CNRS), 1, rue Blessig 67000 Strasbourg, FRANCE
J. C. Petit
Affiliation:
SESD / LECALT, CEN-FAR, B.P.6, 92265 Fontenay-aux-roses, FRANCE
J. P. Eberhart
Affiliation:
Univ. Louis Pasteur, Lab. de Cristallographie, Minéralogie et Pétrographie, 1, rue Blessig, 67000 Strasbourg, FRANCE
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Abstract

Experimental basaltic glass dissolution in fresh water is compared with analyses made on subglacial hyaloclastites from Iceland. The dissolution is initially selective and remains selective if the solution is renewed, whereas it becomes apparently congruent in non-renewed conditions. The congruent dissolution is ascribed to a pH increase (up to 7.0–7.5) which is hampered in the former conditions. The palagonite hydrated layer on the Icelandic basaltic glasses is made up of amorphous to crystallized clay-like materials. The chemical composition of palagonite is close to that of the intergranular clayey material, thus, it is inferred that in most cases no significant chemical gradient exists in the solution between the reaction zone, namely the glass/palagonite interface, and the intergranular solution. We conclude that the dissolution of basaltic glass under subglacial conditions is controlled by thermodynamics and that kinetic constraints, such as the diffusion of species through the altered layers, do not play a major role.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 41
Copyright
Copyright © Materials Research Society 1989

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References

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