Abstract

Analysis of reactions and phase relations among lawsonite, pumpellyite, epidote and associated minerals. Two successive reactions in this sequence, in order of increasing temperature, are: (1) lawsonite + Na-amphibole = epidote + quartz + albite + chlorite + H 2 O; (2) Na-amphibole + pumpellyite + quartz = epidote + Ca-amphibole + albite + chlorite + H 2 O. Pressure of metamorphism is approximately 7 kbar; temperature in the range of 250 to 300 degrees C.--Modified journal abstract.

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