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Low-temperature silicified zone

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

Correlated: High-T zeolite facies

Index Minerals

Quartz, Smectite

Required Geological Setting

Metasomatic rocks (Intermediate acidic)

Occurrence

Metasomatic zone formed by acidic-neutral hydrothermal fluid of 100-250 degree associated with Rhyolitic to Dacitic magma activities. This alteration is called low-temperature silicification. Protoliths are felsic rocks. Low-temperature silicified zone may be associated with Low-T hydrothermal deposits.

Low-temperature silicified zone

Distribution of low-temperature silicified zones described in this site. Yellow lines are volcanic fronts.

Change of mineral assemblages

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

Mineral Assemblages

  • Quartz, Pyrite, Smectite/Illite, Smectite/Chlorite, (Anhydrite)

Localities

Related Occurrences

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