Amphibolitization of Scourian granulites

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Abstract
Synopsis: Scourian granulite-facies gneisses from north-west Scotland occur as relict masses surrounded by amphibolitized granulites. During amphibolitization the gneisses suffered both deformation and metamorphism. Ortho- and clinopyroxenes were replaced by hornblende and hornblende-quartz intergrowths forming corona textures. Seven hornblende and plagioclase analyses are presented. Microprobe scans across the hornblende coronas show that compositional gradients in Si, Al, Fe, Mg and Na existed which were later obliterated by recrystallization. It is suggested that overall loss of Ca and Mg and gain of Na occurred by diffusion through the intergranular fluid during amphibolitization. The water causing amphibolitization is considered to have entered the granulite system along tectonically determined zones.

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