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argillic alteration

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argillic alteration [är′jil·ik ‚ȯl·tə′rā·shən]
(geology)
A rock alteration in which certain minerals are converted to minerals of the clay group.


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Overprinting the host rocks are zones of intense advanced argillic alteration with patches of silica flooding and quartz-alunite replacement which are also indicative of porphyry copper/gold environments.
Argillic alteration that form "clay blooms" may extend away from the veins up to several tens of meters.
This corridor contains three types of gold mineralization, vein type, and two main types of volcanic alterations, highly silicified stockwork possibly representing silica caps and highly argillic alterations with limonite.
 
 
 
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