Résumé
In the Eastern part of the Pyrenees, the Têt fault is a major crustal-scale fault, which locates evidences of an important hydrothermal activity. In this thesis, a multi-scale structural analysis highlights the tectonic and kinematic conditions favourable to hydrothermal flow. Low-Temperature thermochronology coupled with the analysis of Rare Earth Elements in apatites was used as a geothermal exploration tool to identify evidences of fluid circulation at depth along the Têt fault. The coupling of these methods highlighted the spatial distribution and intensity of the thermal anomaly associated with fluid circulation. Outside the hydrothermal zones, thermochronology was used to specify the exhumation history of the different massifs along the Têt fault using thermal and thermo-kinematic numerical modelling. An evolution model of the Eastern part of the Pyrenean range is proposed.