Fig. 5
From: Crystal and melt inclusion timescales reveal the evolution of magma migration before eruption
Volatile contents vs. timescales. H2O and CO2 contents plotted with isobars and calculated diffusion timescales (shown in colour bar). Melt inclusions from the same crystals have been grouped by a circle. Melt inclusion pressures correlate with diffusion timescales, such that deeper melt inclusions are hosted in crystals with longer timescales. Samples with multiple melt inclusions are generally found within the shallow plumbing system (<100 MPa) and with shorter timescales. The isobars and degassing curves were calculated with the average whole rock composition27,28 and the solubility model from ref. 38. The location of the degassing curve was based on the entire melt inclusion suites from refs. 27,28; we show an additional open system degassing curve based on 3 wt% H2O (dotted line). The shift to 2 wt% H2O suggests there may have been some post-entrapment re-equilibration at relatively shallow levels. The melt inclusion pressures may not align perfectly with the isobars because their compositions range from 48 to 56 wt% SiO2, highlighting the limitations of this type of plot for suites of melt inclusions. Error bars show ±2 s.d. for the H2O and CO2 concentrations
