Long-term geochemical behaviour of volatile components such as carbon, sulfur, halogens and noble gases in the Earth is of key importance for understanding numerous geological phenomena, including magmatic processes, interactions between rocks and fluids in subduction zones, and interactions between the deep Earth and the surface.
The very low concentrations of some volatile species (e.g. noble gases, halogens) in many host phases make their study challenging. To better constrain their geochemical behaviour from the upper crust to the Earth’s core, we need additional quantitative data on volatile partitioning and diffusion in minerals, melts, fluids and gases. The role of the crystal-chemistry of minerals, as well as that of melt and fluid composition in controlling the incorporation of volatiles needs to be emphasized alongside extensive parameters, such as temperature, pressure, redox or pH conditions.
The present session aims at bringing together analytical, experimental and computational studies that dive into the complex behaviour of volatile species in the deep Earth, from the rock- to the atom-scales. We encourage but are not limited to contributions addressing the distribution of volatiles between minerals, melts and fluids, the behaviour of volatiles in the lower mantle and the core, and the role played by volatiles in the geodynamical cycles of the deep interiors.