Summary
Basic and pelitic schists of the garnet and biotite zones in the Sanbagawa belt in Shikoku, Japan, commonly contain phengite developed at different stages of metamorphism. Textures of the phengite and associated minerals show that Al-rich phengite is a prograde product and Al-poor phengite is a retrograde product.
Zusammenfassung
Basische und pelitische Schiefer der Granat- und Biotitzonen im Sanbagawa Gürtel in Shikoku, Japan, führen Phengite, die während verschiedener Stadien der Metamorphose entstanden sind. Texturen der Phengite und assoziierter Minerale zeigen, daß Al-reicher Phengit das Produkt prograder Metamorphose ist, während Al-armer Phengit auf retrograde Metamorphose zurückgeht.
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On leave from the Geological Survey of Slovakia, Spissa, Spisska, Nova Ves, Slovakia
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Radvanec, M., Banno, S. & Okamoto, K. Multiple stages of phengite formation in Sanbagawa schists. Mineralogy and Petrology 51, 37–48 (1994). https://doi.org/10.1007/BF01164913
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DOI: https://doi.org/10.1007/BF01164913