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Epidote-Actinolite zone

Chemical Process (Alteration) - Open system under ground (Neutral metasomatism)

Correlated: Pumpellyite-Actinolite facies, Albite-Epidote-hornfels facies


K-feldspar zone

Index Minerals


Required Geological Setting

Metasomatic rocks (Neutral)


Metasomatic zone formed by neutral hydrothermal fluid of 300-350 degree associated with Andesitic magma activities. This alteration is called Epidotization. Epidote-Actinolite zone may be associated with Moderately high-T hydrothermal deposits, High-T hydrothermal deposits, Pneumatolytic deposits, or Porphyry copper deposits.

Epidote-Actinolite zone

Distribution of Epidote-Actinolite zones described in this site. Yellow lines are volcanic fronts.

Change of mineral assemblages

  • [ Appear ] Actinolite, Biotite

Mineral Assemblages

  • [ Felsic Rocks ] Illite, Adularia, Quartz, Pyrite, Biotite, Epidote, Albite
  • [ Mafic Rocks ] Chlorite, Actinolite, Biotite, Epidote, Prehnite, Garnet, Clinopyroxene, Albite, (Pumpellyite)


Related Occurrences

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