Articles | Volume 35, issue 4
https://doi.org/10.5194/ejm-35-613-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-35-613-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Aug 2023
Research article |
| 02 Aug 2023
| 02 Aug 2023
H2O degassing triggered by alkali depletion in bimodal magma injection processes – a new experimental approach
Patricia Louisa Marks
CORRESPONDING AUTHOR
Department of Geosciences, Eberhard Karls University Tübingen,
72074 Tübingen, Germany
Anja Allabar
independent researcher
Marcus Nowak
Department of Geosciences, Eberhard Karls University Tübingen,
72074 Tübingen, Germany
Related subject area
Structure and properties of melts
The effect of oxygen fugacity on the evaporation of boron from aluminoborosilicate melt
Stamatis Flemetakis, Christian J. Renggli, Paul Pangritz, Jasper Berndt, and Stephan Klemme
Eur. J. Mineral., 36, 173–181, https://doi.org/10.5194/ejm-36-173-2024, https://doi.org/10.5194/ejm-36-173-2024, 2024
Short summary
Short summary
Boron is a common additive in industrial glasses used for a wide variety of applications and in experimental degassing studies regarding exoplanet atmospheres. It is therefore important to constrain the behavior of this component in the melt phase. For this reason we investigated experimentally the evaporation of B2O3 from Ca- and Mg-bearing aluminoborosilicate melts at different temperatures, as a function of time and oxygen fugacity.
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Short summary
These results represent the first high-pressure and high-temperature degassing experiments simulating the injection of basaltic melt into a hydrous rhyolitic melt reservoir. Diffusion processes in the contact zone of the melts lead to a depletion of alkalis in the rhyolitic melt interface. The reduced alkali concentration significantly decreases the H2O solubility of the rhyolitic melt and promotes enhanced H2O vesicle formation and further degassing, which can trigger volcanic eruptions.
These results represent the first high-pressure and high-temperature degassing experiments...
