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High-temperature silicified zone

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

Correlated: Albite-Epidote-hornfels facies

Index Minerals

Quartz, Chlorite, Illite

Required Geological Setting

Metasomatic rocks (Intermediate acidic)


Metasomatic zone formed by acidic-neutral hydrothermal fluid of 250-350 degree associated with Rhyolitic to Dacitic magma activities. This alteration is called high-temperature silicification. Protoliths are felsic rocks. High-temperature silicified zone may be associated with Kuroko massive sulfide deposits, Cyprus-type massive sulfide deposits, Felsic-Siliclastic type massive sulfide deposits, Moderate-T hydrothermal deposits, Moderately high-T hydrothermal deposits, High-T hydrothermal deposits, and/or Pneumatolytic deposits.

Change of mineral assemblages

  • [ Extinct ] Smectite
  • [ Appear ] Chlorite, Illite

Mineral Assemblages

  • Rutile, Quartz, Pyrite, Illite, Chlorite


Related Occurrences

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