Geological and geophysical signatures of a large polymetallic exploration target at Lou Lake, southern Great Bear magmatic zone, Northwest Territories
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Abstract
Recent metallogenic studies and a multiparameter airborne geophysical survey have revealed a potentially large polymetallic exploration target in southern Great Bear magmatic zone. Its geological setting comprises an early Proterozoic metasedimentary platform sequence, intruded by granitic plutons and overlain unconformably by a gently dipping rhyolitic volcanic assemblage, which was emplaced during the Great Bear magmatic activity ca. 1865 Ma. The metasedimentary and volcanic rocks form a northwest-trending belt, and host numerous Bi-Cu-Co-Au-As-bearing arsenopyrite-pyrite-magnetite veins and disseminations, localized mainly at the unconformity. This hydrothermal mineralization is characterized by strong potassium enrichment over a 3 x 4 km area, coincident with high magnetic and low eTh/K ratio anomalies, detected by the airborne survey. Follow-up exploration by industry has revealed a coincident gravity anomaly that enhances potential for a large deposit of the type related to the giant Olympic Dam deposit in South Australia.
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