沖縄島北部，名護層に産する含ザクロ石泥質片岩 [in Japanese] Garnet-bearing pelitic schist from the Nago formation in the northern Okinawa Island [in Japanese]
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Garnet-bearing Shimanto pelitic schists occur in the Nago area of north-central Okinawa Island, Japan. The schists consist mainly of phengite, chlorite, quartz, albite, and epidote. They show narrow compositional banding, with bands composed of phengite + chlorite-rich and quartz-rich layers. The banded layers are deformed into isoclinal folds. The garnet occurs as euhedral grains with adjacent pressure shadows of mica and chlorite. The peak pressure-temperature conditions of metamorphism obtained from empirical garnet + muscovite + plagioclase thermobarometry are 4.1-4.6 kbar and 516-568°C, respectively. We propose that these conditions be used as reference values, because of the low almandine content of garnet. This is the first report of garnet-bearing pelitic schist from Okinawa Island.
- The Journal of the Geological Society of Japan
The Journal of the Geological Society of Japan 122(3), 127-132, 2016
The Geological Society of Japan