Skip to main content
Progress in Earth and Planetary Science

Table 1 Enthalpy of D/H fractionation in coexisting fluid and melt in silicate-COH under oxidizing and reducing conditions (data from Mysen 2015a)

From: Redox-controlled mechanisms of C and H isotope fractionation between silicate melt and COH fluid in the Earth’s interior

 

Oxidizing

Reducing

∆H(fluid)*

9.7 ± 2.0 kJ/mol

− 4.9 ± 1.1 kJ/mol

∆H(melt)*

34 ± 4 kJ/mol

− 1.2 ± 0.2 kJ/mol

∆H(Eq. 8)**

24.8 ± 6 kJ/mol

− 4.5 ± 0.5 kJ/mol

  1. In all cases, ideal mixing is assumed
  2. *Enthalpy change from temperature-dependent D/H abundance ratio, ln(XOD/XOH) vs. 1/T (K−1), in fluid and melt
  3. ** Enthalpy change from temperature-dependent exchange equilibrium coefficient between fluid and melt, ln[(XOD/XOH)fluid/[(XOD/XOH)melt] vs. 1/T (K−1)
Back to article page