Résumé
Understanding radiochronometers behaviour is critical to perform thermochronological studies in order to constrain geodynamical processes. However the radiochronometers behaviour is complex since it depends of a wide number of intrinsic and external parameters to the studied system. In the course of this study we ahave attempted to identify the critical factors invoived in processes of isotopic re-equilibration occuring during high-grade metamorphism. The behaviour of Rb/Sr, Ar/Ar and Sm/Nd isotopic system during fluid controlled partial eclogitisation of greenvillian granulites (930 Ma) from the Bergen Arc System (Norway) during aledonian times(c.425 Ma) has been thoroughly studied.