Stages of evolution of a Toarcian compacted claystone around galleries excavated between 1 and 124 years ago by the study of noble gases dissolved in pore water at the Tournemire Underground Research Laboratory (France)
1. University of Bordeaux, CENBG, UMR 5797, POB 120, F-33170, Gradignan Cedex, France. CNRS, IN2P3, CENBG, UMR 5797, POB 120, F-33170, Gradignan Cedex, France;2. IRSN, DEI/SARG/LR2S, POB 17, F-92262 Fontenay-aux-Roses, France