A quantitative approach to exchange phenomena between low temperature hydrothermal solutions and granitic rocks: Methodology and preliminary studies in the Entraygues granite

The choice of a model analogue of a radioactive waste repository requires precise definition of the phenomena to be studied. The main problem to be solved by this approach is the development of low enthalpy geothermal systems near the repository, which would be likely to facilitate the migration of radionuclides towards the surface. A study has thus been undertaken on fossil geothermal systems in order to determine the various characteristics of migration of the elements analogous to the radionuclides (U, Th, REE, Sc, Sr).