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High-pressure granulite facies

Chemical Process (Solid-phase growth) - Middle-P metamorphic facies series

Index Minerals

Sapphirine, Osumilite

Required Geological Setting

Accretionary complexes + Middle-P metamorphic rocks

Occurrence

Metamorphic rocks formed by regional metamorphism in the following condition: more than 700 degree and 1.0-1.5 GPa (30-50 km depth). A metamorphic facies formed in subduction zones. High-pressure granulite facies metamorphic rocks are in Barrovian-type middle-P metamorphic rocks.

Change of mineral assemblages

  • [ Extinct ] Garnet, Cordierite
  • [ Appear ] Sapphirine, Osumilite

Mineral Assemblages

  • [ Felsic Rocks ] Quartz, Plagioclase, K-feldspar, (Hornblende, Biotite)
  • [ Mafic Rocks ] Clinopyroxene (Diopside), Plagioclase, (Orthopyroxene (Hypersthene))
  • [ Ultramafic Rocks ]
  • [ Mudstone ] Sapphirine, Orthopyroxene (Hypersthene), Sillimanite, K-feldspar, Quartz, (Osumilite)
  • [ Laterite ]
  • [ Bedded Mn ]
  • [ Carbonate Rocks ]
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