Seminar Gaétan Milesi

Hydrothermal systems, whether fossil or active, remain challenging to characterize, both in terms of the mechanisms controlling fluid circulation and their relationship with structural evolution. This seminar will focus on the critical role of structural networks and fault-controlled hydrothermal circulation through two case studies: a geothermal system in the eastern Pyrenees and uranium mineralization in the Athabasca Basin, Canada. These examples will be investigated using an integrated approach that combines structural geology multiple geochronological methods, including Ar-Ar / K-Ar dating of clay minerals, Rb-Sr, and U-Pb geochronology, to better constrain the origin and evolution of hydrothermal systems.