5-5-5-5-5-5-5-5-5-5-5-5-5-5 From: "Francisco A. Cáceres Acevedo" <fcaceres@xxxxxx> Dear Colleagues, We would like to bring your attention to our session at IAVCEI in Geneva, Switzerland, June 29th â?? July 4th 2025. Theme 3: Volcanic Processes Session Title: *Crystals and bubbles in magma: Understanding their formation, interaction, feedbacks and effects in magma properties and eruption behaviour* Session Description: Crystals and bubbles form and evolve during magma ascent via nucleation, growth and agglomeration/coalescence. Crystal-bubble interactions from the nano- to macro-scale throughout the different stages of magma ascent affect magma properties, degassing style, ascent rate and ultimately eruptive style. Crystals of different sizes, shapes and compositions can promote heterogeneous bubble nucleation, enhance bubble deformation and coalescence and reduce the critical porosity for permeability in magma. Besides, bubbles, fed by a variety of volatile species with contrasting diffusion coefficients, create obstacles for element diffusion and rheological changes that affect crystal growth kinetics. All these processes and feedbacks can cause eruption style shifts. This session aims to bring together studies on such interactions in three-phase magmas and their effects on magma properties, ascent dynamics and eruptive behaviour. Experiments, analyses of natural rocks, thermodynamic and physical modelling or other relevant approaches on the interactions between solid and gas phases in magma are welcome. Invited speaker: *Dr. Marielle Collombet*, Université Grenoble Alpes, Université Savoie Mont Blanc, Grenoble, France Due date for abstracts: *December 20th*, 2024. We look forward to your submissions and seeing you all in Geneva next year! Sincerely, *Francisco Cáceres*, Universidad Católica del Maule, Talca, Chile *Mathieu Colombier*, Ludwig-Maximilians-Universität München, Munich, Germany *Rebecca deGraffenried*, University of Missouri, Columbia, USA *Kelly N. McCartney*, Lancaster University, Lancashire, United Kingdom *Alain Burgisser*, University Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France Links: *https://sa2025.iavceivolcano.org/theme-3/ <https://urldefense.com/v3/__https://sa2025.iavceivolcano.org/theme-3/__;!!IKRxdwAv5BmarQ!aNNjziMBh8h1mOK-kCGCDUGJrVw8FIUJ5pFyl2nM0fLBAy3p6BZ4QS_uZjrzV97soXn1m4HYgBhbPkUcNsI7OGbWsg$>* *https://on-line-form.eu/iavcei2025sa/abstracts/ <https://urldefense.com/v3/__https://on-line-form.eu/iavcei2025sa/abstracts/__;!!IKRxdwAv5BmarQ!aNNjziMBh8h1mOK-kCGCDUGJrVw8FIUJ5pFyl2nM0fLBAy3p6BZ4QS_uZjrzV97soXn1m4HYgBhbPkUcNsI0PeWrGQ$>* 5-5-5-5-5-5-5-5-5-5-5-5-5-5 ------------------------------
