European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 4
Articles | Volume 37, issue 4
https://doi.org/10.5194/ejm-37-413-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-37-413-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 4
Research article
 | 
04 Jul 2025
Research article |  | 04 Jul 2025

Vesiculation dynamics – Part 2: Decompression-induced H2O vesicle growth, onset, and progression of coalescence

Patricia Louisa Marks and Marcus Nowak

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Short summary
As magma ascends, H2O-supersaturated melt forms fluid vesicles, creating high vesicle number densities (VNDs) and increasing melt porosity, accelerating magma ascent. This study examines how VNDs vary with decompression rate as vesicles begin to coalesce. The shift from decompression-rate-independent to decompression-rate-dependent VND can strongly influence eruption styles, creating permeable channels or forming closed-porosity foams that trap pressurized gas, potentially leading to explosive eruptions.
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Probing the Earth: experiments on and for our planet