Sulfides: major ore minerals on earth - very diverse group
Classification system (Lindgren)
3 Types of Hydrothermal Deposits:
- pressure: moderate to low => not too deep
- common minerals:
- pressure: moderate to high - deeper in crust
- common minerals:
GANGUE: quartz, calcite, rhodochrosite, siderite
- pressure: moderate to high
- common minerals:
GANGUE: quartz, tourmaline, topaz,
*veins undergo a secondary enrichment - become more concentrated in ores
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