Institut des Sciences de la Terre d'Orléans (ISTO) ; CNRS - INSU - Université d'Orléans (UO)
Bureau de Recherches Géologiques et Minières (BRGM)
This work was financially supported by the European Commission in the frame of Bioshale European project (6th Framework program - NMP2-CT-2004-505710), in collaboration with CUPRUM (Poland).
