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1. The mechanics of shallow magma reservoir outgassing: OUTGASSING FROM SHALLOW MAGMA RESERVOIRS

   https://doi.org/10.1002/2017GC006912  

   Parmigiani, A. ; Degruyter, W. ; Leclaire, S. ; Huber, C. ; Bachmann, O. ( August 2017 , Geochemistry, Geophysics, Geosystems)
2. The Survival of Mafic Magmatic Enclaves and the Timing of Magma Recharge

   https://doi.org/10.1029/2020GL087186  

   Ruprecht, Philipp ; Simon, Adam C. ; Fiege, Adrian ( July 2020 , Geophysical Research Letters)

   Many intermediate to felsic intrusive and extrusive rocks contain mafic magmatic enclaves that are evidence for magma recharge and mixing. Whether enclaves represent records of prolonged mixing  or syn‐eruptive recharge depends on their preservation potential in their intermediate to felsic host magmas. We present a model for enclave consumption where an initial stage of diffusive equilibration loosens the crystal framework in the enclave followed by advective erosion and disaggregation of the loose crystal layer. Using experimental data to constrain the propagation rate of the loosening front leads to enclave “erosion” rates of 10⁻⁵–10⁻⁸ cm/s for subvolcanic magma systems. These rates suggest that under some circumstances, enclave records are restricted to syn‐eruptive processes, while in most cases, enclave populations represent the recharge history over centuries to millennia. On these timescales, mafic magmatic enclaves may be unique recorders that can be compared to societal and written records of volcano activity.

    

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3. The Prevalence and Significance of Offset Magma Reservoirs at Arc Volcanoes

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   Lerner, Allan H. ; O'Hara, Daniel ; Karlstrom, Leif ; Ebmeier, Susanna K. ; Anderson, Kyle R. ; Hurwitz, Shaul ( July 2020 , Geophysical Research Letters)

   Determining the spatial relations between volcanic edifices and their underlying magma storage zones is fundamental for characterizing long‐term evolution and short‐term unrest. We compile centroid locations of upper crustal magma reservoirs at 56 arc volcanoes inferred from seismic, magnetotelluric, and geodetic studies. We show that magma reservoirs are often horizontally offset from their associated volcanic edifices by multiple kilometers, and the degree of offset broadly scales with reservoir depth. Approximately 20% of inferred magma reservoir centroids occur outside of the overlying volcano's mean radius. Furthermore, reservoir offset is inversely correlated with edifice size. Taking edifice volume as a proxy for long‐term magmatic flux, we suggest that high flux or prolonged magmatism leads to more centralized magma storage beneath arc volcanoes by overprinting upper crustal heterogeneities that would otherwise affect magma ascent. Edifice volumes therefore reflect the spatial distribution of underlying magma storage, which could help guide monitoring strategies at volcanoes.

    

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4. Seismicity from the deep magma system

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5. Fitful and protracted magma assembly leading to a giant eruption, Youngest Toba Tuff, Indonesia: MAGMA ASSEMBLY OF THE YOUNGEST TOBA TUFF

   https://doi.org/10.1002/2016GC006641  

   Reid, Mary R. ; Vazquez, Jorge A. ( January 2017 , Geochemistry, Geophysics, Geosystems)