Ref.: R.L. Brathwaite and K. Faure, Economic Geology, Vol. 97, 2002, pp. 269-290.
Silicified caps, quartz veins and hydrothermal breccias in andesite.
An hydrothermal eruption occurred in vent structure. Vent breccias are overlain byan eruption breccia tuff ring and by carbonaceous sediments that filled the eruption crater.
Three stages of alteration :
- Calcite-chlorite-smectite (early stage)
- Adularia-quartz-illite (early stage)
- Illite-smectite-kaolinite-pyrite (late stage)
Mineral List
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