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The partitioning behavior of Cl and F between apatite and sediment melt has been investigated by performing piston-cylinder experiments at 2.5 GPa, 800 °C using a hydrous experimental pelite staring material (EPSM) with ~7 wt% H 2 O and variable Cl (~0, 500, 1000, 2000, or 3000 ppm) and F (~0, 700, or 1500 ppm) contents, relevant for subduction zone conditions. Cl and F partitioning between apatite and melt is non-Nernstian, withD   cl    Ap  −  melt$\begin{array}{} D^{\text{Ap}-\text{melt}}_{\text{cl}} \end{array}$varying from 1.9–10.6 andD   F    Ap  −  melt$\begin{array}{} D^{\text{Ap}-\text{melt}}_{\text{F}} \end{array} $varying from 16–72. In contrast, Cl and F partition coefficients between phengite/biotite and melt(   D   cl    Phen-melt    ,D   cl    Bi-melt    ,D   F    Phen-melt    ,    andD   F    Bi-melt    )$\begin{array}{} (D^{\text{Phen-melt}}_{\text{cl}},\,D^{\text{Bi-melt}}_{\text{cl}},\,D^{\text{Phen-melt}}_{\text{F}},\,\text{and}\,D^{\text{Bi-melt}}_{\text{F}}) \end{array} $were determined to be 0.24 ± 0.01, 0.86 ± 0.05, 1.4 ± 0.1, and 3.7 ± 0.4, respectively. The Nernstian partitioning of Cl and F between phengite/biotite and melt suggests ideal mixing of F, Cl, and OH in phengite, biotite, and melt.

Chlorine and fluorine partitioning between apatite and sediment melt at 2.5 GPa, 800 °C: A new experimentally derived thermodynamic model