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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Sodic Alteration. The minerals are albite, magnetite, and epidote.<br />
Sodic<br />
Alteration<br />
Figure 64 - With sodic alteration,<br />
<strong>spectroscopy</strong> sees magnetite and epidote.<br />
Sodic-Calcic Alteration early stages<br />
There is strong albitization (± clinopyroxene, titanite, calc-silicate (clinopyroxene,<br />
amphibole, garnet) - alkali feldspar (K-feldspar, albite) ± Fe-Cu sulphides, and<br />
various assemblages including albite, actinolite, magnetite, apatite and late<br />
epidote. Ca-rich host-rocks are present, with Fe-rich garnet-clinopyroxene ±<br />
scapolite skarn.<br />
Scapolite-actinolite-magnetite<br />
Albite - actinolite-magnetite<br />
Albite-chlorite-epidote-calcite<br />
This is very complex system or systems.<br />
Iron Stage<br />
This stage is largely sterile except for iron ore and apatite. There is an influx <strong>of</strong><br />
magnetite ± biotite.<br />
51<br />
Sodic-Calcic<br />
Figure 65 – Sodic-calcic alteration is more complex.<br />
The plot shows actinolite, iron-chlorite, epidote,<br />
diopside, magnetite, mizzonite, marialite, calcite<br />
and pyrope.
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