[SVC41-P05] Timescales of magmatic processes related to the AD 2000 eruptions at Miyakejima, Japan
Keywords:magma mixing, diffusion timescales, volcanic eruption
Timescales for magma mixing were calculated by modelling diffusion profiles in normally zoned olivine crystals, which record a late-stage magma hybridization event. Mineral chemistry and orientation data were collected by electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD) techniques, respectively. Utilization of multiple elements and correction for diffusion anisotropy ensured that the calculated timescales incorporated recent methodology developments in this field. The new and existing petrological constraints were compared with the time series of monitoring data during the eruptive episode. These comparisons highlight the difficulty of definitively attributing geophysical signals to magma recharge events where complex volcano-magmatic processes occur.