Dear colleagues, We invite you to submit your abstracts to our session "*Exploring the physical and chemical evolution of magmas in volcanic plumbing systems: implications for magma reservoir, conduit processes and eruptive styles*" (included in the Program Theme 3: “Volcanic processes”) at the IAVCEI Scientific Assembly 2025 in Geneva, Switzerland, 29th June – 4th July 2025. Convener: Fabio Arzilli (University of Camerino), Chiara Maria Petrone (Natural History Museum, London), Giuseppe La Spina (INGV-OE Catania), Barbara Bonechi (University of Manchester), Lea Ostorero (University of Milano‐ Bicocca). Session description: Investigating magmatic processes that control the physical and chemical evolution of magmatic properties within volcanic reservoirs is essential for quantifying pre- and syn-eruptive conditions. Magmatic processes, such as magma crystallisation, magma mixing and degassing control magma differentiation and rheology, which in turn influence remobilisation of crystal mushes and cold magmas stored within the crust, formation of eruptible magmas, magma ascent dynamics, magma fragmentation and eruptive behaviour. Analytical and field observations, laboratory experiments and numerical modelling provide invaluable tools to investigate pre- and syn-eruptive conditions and to estimate timescales of magmatic processes occurring before eruptions. This is of paramount importance for policymakers in charge of mitigating the risks associated with volcanic eruptions. In this session we welcome petrological, geochemical, geophysical and volcanological studies based on analytical, experimental, theoretical and numerical-based approaches, with the aim of shedding light on magmatic processes occurring at depth and during ascent towards the surface. Invited Speaker: Dr Martin Mangler (University of Southampton) Abstract submission deadline is the *10th January, 2025* ( https://on-line-form.eu/iavcei2025sa/abstracts/). We look forward to your contributions. All the best Fabio, Chiara, Giuseppe, Barbara and Lea -- Dr. Fabio Arzilli University of Camerino School of Science and Technology, Geology Division Via Gentile III da Varano, 7 62032, Camerino (MC), Italy Twitter: @Fabio_Arzilli ResearchGate: https://www.researchgate.net/profile/Fabio-Arzilli --