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Magma Pressure-Temperature-Time Paths During Mafic Explosive Eruptions

Megan E. Newcombe, Terry Plank, Youxue Zhang, Megan Holycross, Anna Barth, Alexander S. Lloyd, David Ferguson, Bruce F. Houghton, Erik Hauri
2020 Frontiers in Earth Science  
Newcombe et al. Magma Pressure-Temperature-Time Paths conduit models to magmas containing relatively high initial water concentrations (e.g., arc magmas containing ∼4 wt% water). We note that several processes that have been inferred to occur in volcanic conduits such as magma stalling, magma mingling, open-and closed-system degassing, vapor fluxing, and vapor accumulation (in foam layers or as slugs of gas) are associated with different implied vapor volume fractions during syneruptive ascent.
more » ... syneruptive ascent. Given the sensitivity of magma P-T-t paths to vapor volume fraction, the syneruptive thermometer presented here may be a means of identifying these processes during the seconds to hours preceding the eruption of mafic magmas.
doi:10.3389/feart.2020.531911 fatcat:lu2wprioxne3tdmplnkvl4ck2i