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Kaolinite zone

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


Alunite zone (Middle temperature), Argillized zone (Kaolinite)

Index Minerals


Required Geological Setting

Metasomatic rocks (Acidic)


Metasomatic zone formed by acidic hydrothermal fluid of 100-220 degree associated with Rhyolitic magma activities. This alteration is called kaolinitization (kaolinization) and is a part of alunitization or argillization. Protoliths are felsic rocks. Kaolinite zone may be associated with Low-T hydrothermal deposits.

Kaolinite zone

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

Change of mineral assemblages

  • [ Extinct ] Halloysite, Cristobalite
  • [ Appear ] Kaolinite, Quartz, Smectite/Illite, Smectite/Chlorite

Mineral Assemblages

  • Alunite, Kaolinite, Quartz, Pyrite, Smectite/Illite, Smectite/Chlorite, (Böhmite, Gypsum, Anhydrite)


  • Mount Meshimori (Kaolinite)

Related Occurrences

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