Table A3.

Summary of selected thermodynamic solutions of solid-liquid equilibria for bulk rock pumices erupted during paroxysmal events. See text and Figure 6 for details. The melt composition is the average recent pumices reported in Table 1; olivine and clinopyroxene: analyses n. 1 and n. 14 in Table 2; plagioclase: analysis n. 20 in Table 2

Reaction (2): Di=1/2SiO2(liq)+1/2Ol(liq)+Wo(liq)Hydrous melt with H2O=3 wt%
P (MPa)aDiaWo(liq)aFo(liq)Graphic(kJ)log aSiO2T (°C)
100.84850.10840.047746.8573−0.49671090
1000.84840.10880.047946.2083−0.49701106
2000.84820.10920.048045.4956−0.49721124
3000.84810.10960.048144.7926−0.49751141
4000.84800.10990.048344.1000−0.49771157
6000.84780.11060.048542.7481−0.49811187
8000.84760.11120.811241.4434−0.49851215
ReferenceGasparik (1990)Ghiorso & Sack (1995)Ghiorso & Sack (1995)Ghiorso & Sack (1995)
Reaction (3): An+2Fo+SiO3=2CEn+CaTsHydrous melt with H2O=3 wt%
T (°C)aAnaFoaCEnaCaTsGraphic(kJ)log aSiO2P (MPa)
10000.75390.77850.55630.046531.0489−0.4937256
11000.74560.77300.48570.045834.3173−0.4956194
11250.74380.77170.47100.045735.1677−0.4960179
11500.74200.77050.45720.045536.0314−0.4964165
11750.74020.76930.44420.045436.9086−0.4968152
12000.73860.76820.43200.045337.7992−0.4971139
12500.73540.76610.40980.045039.6207−0.4978116
ReferenceNewton et al. (1980)Sack & Ghiorso (1989)Gasparik (1990)Gasparik (1984)Ghiorso & Sack (1995)