On the pumpellyite-actinolite facies

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  • BANNO,Shohei
    Department of Geology and Mineralogy, Faculty of Science, Kyoto University

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  • パンペリー石-アクチノ閃石相について

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The pumpellyite-actinolite facies, which was proposed by HASHIMOTO (1965) as an independent facies, is common in high-pressure intermediate, medium-pressure and in a part of low-pressure facies series, such as those observed in the Sanbagawa, Haarst, and Tanzawa complexes. The mineral paragenesis of the pumpellyite-actinolite facies and its relations to the neighbouring facies are discussed in terms of 3-, 4- and 5-component systems. Analysis of paragenesis of 5-component system is possible only on the lower-grade of the Sanbagawa metamorphism which was described by AIBA (1982). However, 4-component system is usually sufficient to describe the phase relations of this facies. A new approach to treat partial systems of 5-component system is discussed in some detail.

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