An overview of vis-nir-swir field spectroscopy - Spectral International
An overview of vis-nir-swir field spectroscopy - Spectral International
An overview of vis-nir-swir field spectroscopy - Spectral International
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Phyllic<br />
Phyllic alteration commonly forms a peripheral halo around the core <strong>of</strong> porphyry<br />
deposits. It may overprint earlier potassic alteration and may host substantial<br />
mineralization. Detectable minerals include muscovite, illite, quartz, pyrite,<br />
chlorite, hematite, and anhydrite.<br />
Intermediate Argillic<br />
Intermediate argillic alteration generally forms a structurally controlled to<br />
widespread overprint on other types <strong>of</strong> alteration in many porphyry systems. The<br />
detectable minerals include illite, muscovite, dickite, kaolinite, Fe-chlorite, Mgchlorite,<br />
epidote, montmorillonite, calcite, and pyrite.<br />
Figure 39 - Intermediate argillic alterations<br />
contains muscovite, illite, chlorite, kaolinite,<br />
dickite, montmorillonite, calcite, epidote, and<br />
pyrite.<br />
33<br />
Figure 40 - Advanced argillic alteration for a<br />
porphyry system will contain higher temperature<br />
minerals such as Topaz, pyrophyllite, andalusite,<br />
dumortierite, tourmaline, along with alunite,<br />
diaspore, quartz, hematite, and pyrite.
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