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Phlogopite-quartz stability in the system KAlO 2 -MgO-SiO 2 -H 2 O represents a simple model for the stability of biotite in many common, crustal rock types during granulitefacies metamorphism and in the crystallization of intermediate to felsic magmas. Despite many previous experimental and theoretical topological studies, disagreement remains on the stoichiometries and P- T locations of many of the six equilibria emanating from the invariant point at which phlogopite, β-quartz, high sanidine, orthoenstatite, aqueous fluid, and hydrous alumino-silicate melt coexist. In their experimental and modeling study, Vielzeuf and Clemens (1992) resolved most of the disagreement among data sets for the fluid-absent melting reaction Phl + Qtz = En + Sa + M (Fl). The five remaining equilibria form the main subject of this paper:

Phlogopite stability in the silica-saturated portion of the system KAlO 2 -MgO-SiO 2 -H 2 O: New data and a reappraisal of phase relations to 1.5 GPa