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Cordilleran Vein Type Deposits Examples

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<strong>Vein</strong>s 11/3/10<br />

• 50 x 20 km area<br />

• District-­‐wide zoning<br />

– Au in north<br />

– Pb-­‐Zn in center<br />

– Cu-­‐Ag in south<br />

• Underlain by:<br />

General Seong<br />

– Proterozoic Belt Group<br />

– Cretaceous igneous intrusions<br />

– Ter>ary and Quaternary unconsolidated units<br />

Belt Group<br />

• Quartzites, argillites and calcareous rocks<br />

up to 6km thick<br />

• Shallow water origin<br />

– Mud cracks, ripples, stromatolites<br />

• Folded, faulted and minor metamorphism<br />

in Proterozoic and during Laramide<br />

– Monzonite stocks and lamprophyre dikes and<br />

sills were intruded aver Mesozoic deforma>on<br />

– Minor diabase sills appear to be Precambrian<br />

18

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