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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1998). Mineralogies dominated by pyrophyllite-diaspore-dickite may be<br />
indicative, but not exclusively, <strong>of</strong> higher temperature (deeper) conditions,<br />
whereas lower temperature (opaline) pervasive silicification or alunite-kaolin<br />
dominate in cooler (higher level) settings. Similarly, thin alteration zones may<br />
suggest that fluid conditions have changed rapidly, possibly in a quenched higher<br />
level system (or distal to the fluid upflow), whereas wide zonation characterizes<br />
slower changing fluid conditions more typical <strong>of</strong> deeper levels (or more proximal<br />
to the fluid upflow).<br />
Figure 30 - Advanced Argillic Alteration spectra show<br />
pyrophyllite, topaz, zunyite, dickite, alunite, quartz,<br />
hematite, and pyrite.<br />
27<br />
Figure 31 - Intermediate Argillic Alteration shows<br />
kaolinite, illite, illite/smectite, montmorillonite, quartz,<br />
pyrite
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