Abstract
The results of this partial study on element distribution of a hydrothermally altered granite in the Langenberg site lead to conclude on :
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probable mobility for most part of major elements except SiO2 and Al2O3;
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a pronounced mobility for light REE (La, Ce);
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a weak mobility for U;
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no or weak mobility for heavy REE.
Comparison with chemical analogues for long-lived nuclides present in high-level radioactive waste are discussed.
Element mobilities are strongly controlled by intensive chemical parameters, e.g., pH or fCO2, that destroy element-bearing minerals or allow crystallization of scavenger minerals.
According to the now admitted temperature for radwaste disposal of about 100°C for a far field, and data on stability of alteration paragenesis, it is possible to deduce that the alteration grade reached in granite, by induced hydrothermal system, will be clay facies.
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Griffault, L., Jebrak, M., Lemiere, B., Piantone, P., Sureau, J.F. (1987). Hydrothermal Alteration Systems as Analogues of Nuclear Waste Repositories in Granitic Rocks An example: The Langenberg hydrothermal system. In: Côme, B., Chapman, N.A. (eds) Natural Analogues in Radioactive Waste Disposal. Radioactive Waste Management Series. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3465-8_19
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