1963•Journal of Geophysical Research AtmospheresRequires access

Some equilibrium reactions in the join CaAl2Si2O8-H2O

Robert C. Newton, G. C. Kennedy

Abstract

The equilibriums lawsonite ⇌ zoisite + kyanite + quartz + vapor and zoisite + sillimanite + quartz ⇌ anorthite + vapor have been determined in the temperature range 500° to 950°C and in the pressure range 7 to 33 kb. The results indicate an invariant point involving the phases lawsonite, anorthite, zoisite, sillimanite, quartz, and vapor at 5.4 kb and 410°C. The course of the equilibrium lawsonite ⇌ anorthite + water in the range of geologic interest has been estimated from the present data. A few applications to regional metamorphism and the mechanism of batholith formation are discussed.

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Key concepts: Anorthite, Kyanite, Lawsonite, Sillimanite, Quartz, Geology, Mineralogy, Grossular