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Greenschist facies

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

Index Minerals

Epidote, Actinolite, Muscovite

Required Geological Setting

Accretionary complexes + High-P metamorphic rocks

Accretionary complexes + Middle-P metamorphic rocks

Accretionary complexes + Low-P metamorphic rocks


Metamorphic rocks formed by regional metamorphism in the following condition: 350-500 degree and 0.2-1.2 GPa (5-30 km depth). A metamorphic facies formed in subduction zones. Greenschist facies metamorphic rocks are in Sanbagawa-type intermediate high-P metamorphic rocks, Barrovian-typ middle-P metamorphic rocks, and in Ryoke-type low-P metamorphic rocks.

Greenschist facies

Distribution of metamorphic rocks subjected to Greenschist facies regional metamorphism described in this site. Protolith of blue dots is bedded Mn deposit, protolish of red dots is serpentinite, and protoliths of green dots are igneous rocks and sedimentary rocks. Yellow zones are metamorphic belts.

Change of mineral assemblages

  • [ Extinct ] Illite, Pumpellyite, Zeolites
  • [ Appear ] Muscovite, Actinolite/Tremolite, Spessartine

Mineral Assemblages

  • [ Felsic Rocks ] Albite, Quartz, Epidote, Muscovite, (Stilpnomelane)
  • [ Mafic Rocks ] Chlorite, Albite, Epidote, Actinolite
  • [ Ultramafic Rocks ] Clinochlore, Serpentine (Antigorite), Brucite, Diopside, (Talc, Actinolite/Tremolite, Clinozoisite)
  • [ Mudstone ] Muscovite, Chlorite, Albite, Quartz, Spessartine, Graphite
  • [ Laterite ] Chloritoid, Chlorite, Muscovite/Paragonite, Quartz
  • [ Bedded Mn ] Quartz, Muscovite, Piemontite, Braunite, Spessartine, Albite
  • [ Carbonate Rocks ] Calcite/Dolomite, Quartz, (Talc, Tremolite)
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