Seminar Alexis Bernard

This study investigates the origin and migration of magmas in the active South Aegean volcanic arc (Greece) through the analysis of the chemical and isotopic compositions of volcanic gases, with a particular focus on helium, neon, and argon, which are powerful tracers of geological fluids. The first objective is to better understand the composition of the mantle source of these magmas and the geological parameters that control it. The second objective is to study the evolution of the Santorini volcano between 2015 and 2022 to monitor volcanic activity. The results reveal significant spatial variations in magma composition, which are attributed in this study to the subduction of the Adriatic continental crust. At Santorini, geochemical data confirm a quiescent state of the volcano during the study period. These findings emphasize the need for multidisciplinary and continuous approaches to better understand the origin and activity of volcanic arcs.