The behavior, mobility, and transformations of volatile elements (H₂O, CO₂, S, halogens, nitrogen, and noble gases) fundamentally influence mantle melting, magma ascent, and eruption dynamics. Understanding how these volatiles evolve from deep mantle sources through magmatic systems to volcanic emissions is critical for decoding Earth's geodynamic processes and volcanic behavior. This session brings together researchers using geochemical, isotopic, experimental, and modeling approaches to investigate volatile speciation and mobility within the melts; track volatile transport and degassing processes during magma ascent; investigate the effects of changes in volatile behavior on magma viscosity, buoyancy, and eruption style; explore the implications of mantle volatile heterogeneity for magmatic volatile behavior in the trans-crustal magmatic system; and integrate experiment and geochemical observations to constrain volatile pathways from the mantle to Earth's surface. By combining diverse perspectives, this session aims to significantly advance our understanding of volatile cycling, mantle processes, and their connections to volcanic activity.

• DI - Study of the Earth's Deep Interior