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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Author(s)

    • 馬場 壮太郎 Baba Sotaro
    • 琉球大学教育学部自然環境科学教育コース Department of Natural Environment Science Education, University of the Ryukyus
    • 内間 一生 Uchima Issei
    • 琉球大学教育学部自然環境科学教育コース Department of Natural Environment Science Education, University of the Ryukyus

Abstract

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.

Journal

  • 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

Codes

  • NII Article ID (NAID)
    130005158297
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    027265274
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
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