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TitleGeological and geophysical signatures of a large polymetallic exploration target at Lou Lake, southern Great Bear magmatic zone, Northwest Territories
DownloadDownload (whole publication)
AuthorGandhi, S S; Prasad, N; Charbonneau, B W
SourceCurrent Research/Recherches en cours; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1996-E, 1996 p. 147-158, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (1996). Current Research, Geological Survey of Canada, Current Research no. 1996-E
File formatpdf
ProvinceNorthwest Territories
NTS85N/10; 85N/07NE
AreaLou Lake
Lat/Long WENS-117.0000 -116.5000 63.6667 63.4167
Subjectsstructural geology; igneous and metamorphic petrology; metallic minerals; geophysics; mineral deposits; polymetallic ores; lithology; plutonic rocks; granites; rhyolites; volcanic rocks; igneous rocks; geophysical surveys; hydrothermal alteration; alteration; mineralization; uranium; thorium; potassium; uranium thorium ratios; uranium potassium ratios; thorium-potassium ratios; gamma-ray surveys; metavolcanic rocks; metasedimentary rocks; metamorphic rocks; structural trends; structural controls; unconformities; structural features; gravity anomalies; arsenopyrite; pyrite; magnetite; sulphides; vein deposits; bismuth; copper; cobalt; exploration guidelines; mineral occurrences; structural analyses; structural interpretations; arsenic; gold; metallogeny; Great Bear Magmatic Zone; Proterozoic
Illustrationssketch maps; cross-sections
ProgramCanada-Northwest Territories Mineral Initiatives, 1991-1996
Released1996 08 01
AbstractRecent 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.