Guillaume Georgeais

My current work is based on natural and experimental studies with a twist of numerical modeling on top. My research involves a mix of melt inclusions, embayments and crystals composition, and pyroclasts texture. The main goals are :

(1) to investigate how the surfacic physical processes (eruption size) are affected by the deep chemical parameters and (2) to reconcile the range of magma ascent rate estimated from the various geophysical or geochemical methods.


Ph.D. Université Clermont-Auvergne, France. Title: “Relations between magma ascent rate and explosivity”

B.Sc, M.Sc in Earth Sciences, Univ. B. Pascal, Clermont-Fd, France


  • 2023

Moussallam Y., Georgeais G, Rose-Koga E.F., Koga K.T., Hartley M., Scaillet B., Oppenheimer C., Cannat Mathilde., Escartin J., Mevel C., “CO2-Undersaturated Melt Inclusions From the South West Indian Ridge Record Surprisingly Uniform Redox Conditions” DOI: 10.1029/2023GC011235

  • 2021            

Georgeais G., Koga K., Moussallam Y., Rose-Koga E. Magma decompression rate calculations with EMBER: A user‐friendly software to model diffusion of H2O, CO2 and S in melt embayments. Geochemistry geophysics geosystems, DOI:10.1029/2020GC009542

Moussallam Y., Médard E., Georgeais G., Rose-Koga E., Gurioli L., Pelletier B., Bani P., Grandin R., Boichu M., Shreve T.L., Tari D., Peters N. How to turn off a lava lake? A petrological investigation of the 2018 intra-caldera and submarine eruptions of Ambrym volcano. Bulletin of Volcanology vol. Special volume, DOI:10.1007/s00445-021-01455-2.