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Experimental studies of Cl solubility in trachytic to phonolitic melts provide insights into the capacity of alkaline&#13; magmas to transport Cl from depth to the earth?s surface and atmosphere, and information on Cl solubility&#13; variations with pressure, temperature and melt or fluid composition is crucial for understanding the reasons for&#13; variations in Cl emissions at active volcanoes. This paper provides a brief review of Cl solubility experiments&#13; conducted on a range of trachytic to phonolitic melt compositions. Depending on the experimental conditions&#13; the melts studied were in equilibrium with either a Cl-bearing aqueous fluid or a subcritical assemblage of low-&#13; Cl aqueous fluid + Cl-rich brine. The nature of the fluid phase(s) was identified by examination of fluid inclusions&#13; present in run product glasses and the fluid bulk composition was calculated by mass balance. Chlorine&#13; concentrations in the glass increase with increasing Cl molality in the fluid phase until a plateau in Cl concentration&#13; is reached when melt coexists with aqueous fluid + brine. With fluids of similar Cl molality, higher Cl&#13; concentrations are observed in peralkaline phonolitic melts compared with peraluminous phonolitic melts; overall&#13; the Cl concentrations observed in phonolitic and trachytic melts are approximately twice those found in calcalkaline&#13; rhyolitic melts under similar conditions. The observed negative pressure dependence of Cl solubility implies&#13; that Cl contents of melts may actually increase during magma decompression if the magma coexists with&#13; aqueous fluid and Cl-rich brine (assuming melt-vapor equilibrium is maintained). The high Cl contents (approaching&#13; 1 wt% Cl) observed in some melts/glasses from the Vesuvius and Campi Flegrei areas suggest saturation&#13; with a Cl-rich brine prior to eruption

Chlorine solubility in evolved alkaline magmas