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Journal of Petrology
In a system open to both potassium and water, the conditions for two different chloritebiotite equilibrium reactions may be depicted on an isobaric temperature-[K + ]/[H + ] diagram. At moderate values of the [K + ]/[H+] ratio in the fluid phase pervading the system, muscovite is involved in the equilibrium reaction: chlorite+quartz+KOH = biotite+muscovite+H,O. At high values of [K + ]/[H + ], K-feldspar is involved in the equilibrium reaction: chlorite + quartz+KOH = biotite+K-feldspar+H,O.doi:10.1093/petrology/7.3.404 fatcat:rgi77yrodvbw7kx3v3kpus2yeu