Hi everyone, We are thrilled to announce our session at Goldschmidt 2025 (6-11 July) in Prague: “Diffusion-controlled processes: Unravelling the intricate history of magmatic and mantle processes”. This session is in Theme 02, session 02j. *Abstract deadline: *February 26, 23h59 (CET/UTC +1) *Submit an abstract and browse sessions at:* conf.goldschmidt.info/goldschmidt/2025/cfp.cgi *Conveners:* Maria Dias, Thilo Bissbort, Carlo Pelullo and Sylvie Demouchy *Session abstract:* A thorough understanding of the underlying mechanisms and quantification of diffusion-controlled processes as a function of key thermodynamic parameters (e.g., composition, temperature, pressure, fugacities of volatile species, etc) is fundamental for Earth and planetary sciences. Indeed, ionic diffusion is a ubiquitous process which takes place in both crystalline and amorphous matter, at all spatial scales and within all envelopes of Earth and planetary bodies. Thus, it is not surprising that it finds application as a tool for determining timescales of terrestrial and planetary processes, such as constraining reaction mechanisms of minerals, magma ascent rates, or flow of mantle rocks. Recent analytical, experimental, and computational advancements have significantly extended the range of conditions and materials that can be studied, offering new insights into the kinetics of different processes across diverse geological settings. This session will cover all diffusion-related processes, including diffusion chronometry studies, experimental quantification of diffusivities, diffusion-driven stable isotope fractionation and other areas of applicability such as geospeedometry. We welcome studies from broad geological contexts, from planetary interiors and Earth’s mantle to shallow magmatic and volcanic environments. We particularly encourage new methodological, analytical, theoretical or experimental approaches. We hope to see you all in Prague! Please, feel free to spread the word and share this information with other potentially interested colleagues. Kind regards, Maria, Thilo, Carlo and Sylvie -- ******************************************************************************* Maria Dias, Ph.D. Ruhr-Universität Bochum Universitätsstraße 150 IA 4/105 D-44801 Bochum Phone +49 (0) 234 32-23517 Email: maria.dias@ruhr-uni-bochum.de <mailto:maria.dias@ruhr-uni-bochum.de> *******************************************************************************