Dear Colleagues, Did we catch your interest? Goldschmidt session 2d could be your home for an exhilarating trip to planetary interiors and their fluid envelopes: *Understanding redox processes in the interiors and atmospheres of terrestrial planets – featuring Hongluo Zhang (China University of Geosciences, Beijing) as keynote speaker* Description: The knowledge of the oxidation state and partitioning behaviour of heterovalent elements (e.g., Fe, V, Co, Cr, C, S, etc.) in minerals, melts and fluids is fundamental to track redox processes occurring in the terrestrial planets through space and time. Some of these processes include, but are not limited to, formation of the cores and atmospheres of these planets, evolution of Earth’s mantle redox state through time, the partial melting of mantle rocks (e.g., promoted by the circulation of oxidized volatile species such as CO2 and H2O), diamond formation, abiotic dehydrogenation and methanogenesis in metamorphic environments. Volatile release through volcanic gases and their subsequent exchange with the solid Earth and the exosphere has implications for the composition of the atmosphere of the Earth, as well as habitability of rocky planets more generally. We invite contributions on mineralogical, petrological and geochemical studies aimed to constrain redox-driven processes both at the surfaces and at depth of terrestrial planets. Best wishes, Vincenzo Stagno (Sapienza University of Rome) Yanhao Lin (Center for High Pressure Science & Technology Advanced Research) Jessica M. Warren (University of Delaware) Weidong Sun (Deep-Sea Multidisciplinary Research Center, Laoshan Laboratory) Sonja Aulbach (Goethe-Universität Frankfurt) Paolo A. Sossi (ETH Zürich) --------------------------------------- Professor Jessica M. Warren Department of Earth Sciences University of Delaware www.jessicamwarren.com