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-37-385-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-37-385-2025
© 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 1: Decompression-induced H2O vesicle formation in the Lower Laacher See phonolitic melt

Patricia Louisa Marks and Marcus Nowak

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Short summary
We provide new insights into the release of H2O from the phonolitic melt of the Laacher See volcano. Decompression experiments conducted at superliquidus conditions revealed uniformly dispersed vesicles throughout the samples, with extremely high vesicle numbers regardless of the decompression rate. These findings enhance our understanding of volcanic eruptions and might suggest that rapid volatile release due to off-critical spinodal decomposition increases explosive volcanic activity.
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Probing the Earth: experiments on and for our planet