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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)