Fluorine partitioning between quadrilateral clinopyroxenes and melt

Abstract Concentrations of fluorine and chlorine were measured in glasses (quenched melts) coexisting clinopyroxene, orthopyroxene, olivine, plagioclase run products experiments previously used to measure sulfur partitioning between these phases. The F clinopyroxene silicate melt was determined 13 at a variety pressures, temperatures, compositions ranging from basaltic dacitic (49 66 wt% SiO2) 0.8 1.2 GPa 1000 1240 °C, hydrous anhydrous conditions. Additionally, we the crystal-melt for 4 with plagioclase, 2 1 olivine. Although Cl also experiments, concentrations crystals are close background concentration levels. partition coefficients varied ~0.09 0.29 linearly dependent upon aluminum octahedral M1 site clinopyroxene. Similar relationships seen when our results combined previous measurements coefficient melt, but each study shows its own unique correlation AlM1. These dissimilarities correlations AlM1 attributed differing analytical protocols various studies. However, data set demonstrates linear AlM1, inverse NBO/T ratio (T/NBO), pressure temperature, which can be described as: l n ⁡ ( D C p x / L ) = 0.2298 ± 0.04847 T N B O - 1.029 0.8045 A M 3889 1803 0.5472 0.1084 P + 0.5871 1.304 , where uncertainty is standard error fit (as calculated by R-project software), K, GPa. this relationship reproduces 81% within 25% (relative), different trends coefficient, DFCpx/L vs. laboratories suggest need additional investigations development standards certified compositions. Nevertheless, conclude that self-consistency indicates using one protocol applied minerals or analyzed same ion microprobe better understand storage transport magmatic systems.