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The Influence of Phenocrysts on Degassing in Crystal-Bearing Magmas With Rhyolitic Groundmass Melts

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)5127-5136
Number of pages10
JournalGeophysical Research Letters
Issue number10
DateAccepted/In press - 22 Apr 2019
DatePublished (current) - 28 May 2019


The porosity at which a magma becomes permeable (i.e., the percolation threshold; ϕc) is important for magma degassing; it is also poorly constrained in crystal-bearing systems. To address this, we conduct high pressure-temperature decompression experiments on water-saturated rhyolitic melts with variable crystal contents. We find that crystal-bearing run products become permeable at ~55-vol.% vesicularity (crystal free), a value that is similar to that found in decompression-crystallization experiments using basaltic andesite compositions. Our results provide insight into controls on the eruption styles of hydrous, crystal-bearing magmas in general and controls on pulsatory Vulcanian behavior, in particular.

    Research areas

  • magma degassing, permeability, rhyolite, Vulcanian eruptions



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