TrekGEO > Mineral Trail > Occurrence > Interstratified mineral zone

Japanese page

Interstratified mineral zone

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

Correlated: High-T zeolite facies


Smectite/Illite zone, Smectite/Chlorite zone, Argillized zone (Interstratified mineral)

Index Minerals

Interstratified minerals (Smectite/Illite, Smectite/Chlorite)

Required Geological Setting

Metasomatic rocks (Neutral)


Metasomatic zone formed by neutral hydrothermal fluid of 100-220 degree associated with Andesitic magma activities. This alteration is called illitization or chloritization, and is a part of argillization. Interstratified mineral zone may be associated with Kuroko massive sulfide deposits, Backarc-type massive sulfide deposits, Cyprus-type massive sulfide deposits, Felsic-Siliclastic type massive sulfide deposits, or Low-T hydrothermal deposits.

Interstratified mineral zone

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

Change of mineral assemblages

  • [ Extinct ] Saponite, Montmorillonite
  • [ Appear ] Smectite/Illite, Smectite/Chlorite

Mineral Assemblages

  • [ Felsic Rocks ] Smectite/Illite, Pyrite, Calcite, Quartz, (Gypsum, Dolomite)
  • [ Mafic Rocks ] Smectite/Chlorite, Calcite, (Dolomite)


Related Occurrences

Copyright (c) 2014 NariNari, All Rights Reserved.