Fractionation of fluorine and chlorine during subduction zone metamorphism and arc magma composition Abstract: Fluorine and chlorine are found in magmatic gas/fluid phases in trace quantity along with H2O, CO2, and SO2. Because of halogens' sluggish volatility, compared to H2O and CO2, fluorine and chlorine are ideal geochemical tracers of the magmatic volatile component for the subduction zone…

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