Figure F3. The assemblages of hydrothermal minerals in altered dacite show systematic differences between the Snowcap and the Roman Ruins sites. At Roman Ruins there are abundant samples with high concentrations of normative K-feldspar, whereas at Snowcap the samples are comparatively poor in K-feldspar but contain elevated concentrations of pyrophyllite + paragonite.

Figure F3. The assemblages of hydrothermal minerals in altered dacite show systematic differences between the Snowcap and the Roman Ruins sites. At Roman Ruins there are abundant samples with high concentrations of normative K-feldspar, whereas at Snowcap the samples are comparatively poor in K-feldspar but contain elevated concentrations of pyrophyllite + paragonite.