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TitleMetallogeny and geology of the Half Way Hills area, central Churchill Province, Northwest Territories (Nunavut)
DownloadFree download (whole publication) (pdf 37407 KB)
AuthorKerswill, J A; Kjarsgaard, B A; Bretzlaff, R; Jenner, G A; Samaras, C
SourceCanadian Shield/Bouclier canadien; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1999-C, 1999 p. 29-41,
PublisherNatural Resources Canada
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (1999). Canadian Shield, Geological Survey of Canada, Current Research no. 1999-C
AreaThelon River; Whitehills Lake; Half Way Hills
Lat/Long WENS-96.5000 -96.0000 64.7167 64.5333
Subjectsigneous and metamorphic petrology; geochemistry; metallic minerals; metallogeny; bedrock geology; volcanic rocks; basalts; igneous rocks; greywackes; conglomerates; iron formations; sedimentary rocks; mineralization; gold; mineral occurrences; plutonic rocks; granitic rocks; lithogeochemistry; lithology; analyses; major element analyses; trace element analyses; geochemical analyses; copper; lead; zinc; arsenic; manganese; exploration guidelines; base metals; Archean; Churchill Province; Precambrian
Illustrationssketch maps; analyses; photographs; plots
ProgramWestern Churchill NATMAP Project
Released1999 02 01
AbstractThe Half Way Hills supracrustal domain contains a complex `assemblage' including extensive pillowed tholeiitic basalt, minor komatiitic basalt, minor felsic volcanic rocks as well as greywacke, quartzite, conglomerate, and extensive pyritic iron-formation. Two distinct volcanic belts have been tentatively identified.
The northern volcanic belt contains a diverse metal endowment hosted largely by deformed quartz-carbonate veins variably enriched in gold, silver, and base metals. Gold, polymetallic, and Cu-Pb-Zn occurrences are spatially associated with elliptical granitoid plutons, typically possess high Ag/Au ratios, and locally contain anomalous concentrations of one or more of Mo, W, Bi, Sb, and As. Anomalous concentrations of gold have also been identified in carbonate-bearing iron-formation and in extensive carbonate-rich alteration zones in ultramafic- mafic rocks.
Evidence to date suggests that significant metals were concentrated by synvolcanic processes, possibly linked to intrusion of the granitoid plutons.