Study of Bromine Behavior in Felsic Cl and F Magmas at High Temperature and Pressure: Experimental Results (800-1100°C, 10-200 MPa)

In this study, fluid melt partitioning experiments were carried out using natural silicate glasses, containing Cl and F concentrations, with phonolitic, comtonic and pantelleritic compositions. The data also enabled us to observe the impact of temperature and pressure on the partition coefficient of Br and Cl in the vapor phase, as well as the influence of oxidation and reduction in magmatic systems. In addition, experiments have shown that F concentration favors demixing of the fluid phase, and that exsolution of vapor and brine effectively removes Br from peralkaline magmas, limiting its flux to the atmosphere.