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The paper presents preliminary results of an experimental study of the reactions of phlogopite formation in the presence of an aqueous-salt fluid at a pressure of 5 GPa. The experiments were carried out in the following systems: pyrope - enstatite, pyrope - grossular - enstatite, pyrope - knorringite - enstatite. Experiments have shown that the ratios of Al concentrations in orthopyroxene and Cl in phlogopite are good indicators of KCl activity in the fluid.