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Pyrophyllite zone

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

Index Minerals


Required Geological Setting

Metasomatic rocks (Acidic)


Metasomatic zone formed by acidic hydrothermal fluid of 250-350 degree associated with Rhyolitic magma activities. This alteration is called pyrophyllitization. Protoliths are felsic rocks. Pyrophylllite zone may be associated with Moderately high-T hydrothermal deposits.

Pyrophyllite zone

Distribution of Pyrophyllite zones described in this site. Yellow lines are volcanic fronts.

Change of mineral assemblages

  • [ Extinct ] Natroalunite-2c (Minamiite), Dickite, Nacrite
  • [ Appear ] Pyrophyllite, Diaspore

Mineral Assemblages

  • Alunite, Pyrophyllite, Diaspore, Rutile, Quartz, Pyrite, Illite, Chlorite, (Anhydrite, Zunyite, Topaz)


Related Occurrences

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