Fig. 4.

Plots of temperature vs. a fluorine and b chlorine partition coefficients between olivine and silicate melt. Dashed lines represent the best fit through the data of Joachim et al. (2015) and this study excluding the overestimated slow-cooled sample targeting at 1500 °C (cooled to target temperature with 1 °C/min; in parentheses; see Joachim et al. 2015 for details) and in (a) the almost dry sample (CMAS_dry; 0.03 (2) wt% H₂O) of this study. A detailed discussion is provided in "Potential effect of water on fluorine concentrations and F/H₂O ratios during partial melting in the upper mantle". Note that experiments of Joachim et al. (2015) and this study were performed between 0.3 and 2.3 GPa, implying that the effect of pressure is negligible in this range. The following equations describe the, a fluorine partitioning behavior between olivine and silicate melt in the presence of a bulk water content of approximately 0.2–0.3 wt% H₂O and b chlorine partitioning behavior that is not affected by the bulk water content: a $D_{\text{ol}/\text{melt}}^{\text{F}}$ = 3E – 12e^{0.0157 × T(°C)} (R ² = 0.99); b ${\text{D}}_{\text{ol}/\text{melt}}^{\text{Cl}}$ = 4E-16e^{0.0211 × T(°C)} (R ² = 0.99)