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Table 2 Parameters for the calculation of the vapor and liquid phases

From: Behavior of magmatic components in fumarolic gases related to the 2018 phreatic eruption at Ebinokogen Ioyama volcano, Kirishima Volcanic Group, Kyushu, Japan

Term

Symbol

Value

Unit

Temp. of MV

 

900

°C

Temp. of LW

 

15

°C

Enthalpy of MV

HMV

4391

kJ/kg

Enthalpy of LW

HLW

64

kJ/kg

Enthalpy of Vp ditto

At 100 ℃

HVp

2676

kJ/kg

At 160 ℃

HVp

2757

kJ/kg

Enthalpy of Lp ditto

At 100 ℃

HLp

417

kJ/kg

At 160 ℃

HLp

677

kJ/kg

δ18O of MV

δMV

− 8.0

δ18O of LW

δLW

− 8.2

δD of MV

δMV

− 15.0

δD of LW

δLW

− 53.5

Ar/H2O ratio of MV

CMV

0

 

Ar/H2O ratio of LW

CLW

3.0 × 10–7

 

18O/16O fractionation factor

α

a

 

D/H fractionation factor

α

a

 

Ar/H2O distribution coefficient

β

b

 
  1. a: Horita and Wesolowski (1994), b: Fermandez–Prini et al. (2003)
  2. Enthalpy values are cited from the standard steam table (e.g., Japan Society of Mechanical Engineers 1999)