Andesite Vesicules
Chemical Process (Vapor-phase Growth) - Closed system under ground
Required Geological Setting
Island arc volcanoes, Intra-oceanic arc volcanoes
Occurrence
Minerals in vesicules of andesites. Gas components in andesite magma is released in the cooling process of lava, and they form open spaces as vesicules in andesites. Vesicules are distributed at the upper parts of domes, and are very few at the lower parts.
Distribution of andesite vesicules described in this site. Yellow lines are volcanic fronts.
Early stage (Host sides) >> Late stage (Center of visicules)
Cristobalite >> Augite >> Tridymite (Tabular)+Ilmenite >> Pargasite >> Tridymite (Wedged) >> Phlogopite >> Magnetite+Hypersthene >> Tridymite (Prismatic) >> Magnetite+Quartz
Manganese calcite+Chalcedony >> Heulandite >> Datolite+Mordenite >> Apophyllite >> Natrolite >> Stilbite >> Chabazite >> Stilbite+Calcite
Celadonite >> Aragonite
Localities
- Choshi (Lava, Aragonite)
- Koiji (Lava, Aragonite)
- Awashima island (Dyke, Cristobalite)