Cordilleran Vein Type Deposits Examples
Cordilleran Vein Type Deposits Examples
Cordilleran Vein Type Deposits Examples
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<strong>Vein</strong>s 11/3/10<br />
Generaliza>ons -‐1<br />
• Associa>on in space and >me with calc-‐<br />
alkaline igneous ac>vity<br />
• Hydrothermal transport of ore components,<br />
deposited epigene>cally in faults<br />
• Ore minerals as typical open-‐space fillings<br />
or co-‐precipitates in silicate host rocks and<br />
as replacements in carbonate hosts<br />
• Deposi>on within 1+ km of the surface<br />
• Well developed metal zona>on<br />
Generaliza>ons-‐2<br />
• Sulfur isotope ra>os close to 0 ‰<br />
• Structural control<br />
• Typically well-‐developed bilaterally<br />
symmetrical wall-‐rock altera>on<br />
• Normally contain porphyry-‐Cu suite of<br />
elements with zona>on from (Sn-‐W-‐)Mo-‐<br />
Cu-‐Zn-‐Pb-‐Mn-‐Ag<br />
• Magma>c-‐hydrothermal fluids mixed (late,<br />
post-‐ore?) with meteoric fluids<br />
2
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