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TitleImplications of a preliminary fluid-inclusion study of giant quartz veins of the southern Great Bear magmatic zone, Northwest Territories
AuthorGandhi, S S; Carrière, J J; Prasad, N
SourceGeological Survey of Canada, Current Research (Online) no. 2000-C1, 2000, 13 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; (2000). Current Research 2000, Geological Survey of Canada, Current Research (Online) no. 2000-ABCDE
File formatpdf
ProvinceNorthwest Territories
NTS85N/07NE; 85N/10
AreaMarian River; Crowfoot Lake; Cole Lake; Hump Lake; Betty Ray Lake; Treasure Lake; Maryleer Lake; Burke Lake; Lou Lake
Lat/Long WENS-116.8333 -116.4167 63.7500 63.4167
Subjectsgeochemistry; structural geology; igneous and metamorphic petrology; fluid inclusions; quartz veins; faults; structural features; veins; stockworks; mineralization; pitchblende; hematite; specularite; pyrite; sulphides; uranium; salinity; Great Bear Magmatic Zone; Crowfoot uranium showing; Ted uranium showing; Precambrian
Illustrationssketch maps; photomicrographs; analyses
ProgramCanada-Northwest Territories Mineral Initiatives, 1991-1996
Released2000 01 01
AbstractGiant quartz veins occur along brittle faults in the ca. 1865 Ma Great Bear magmatic zone. They comprise two or more generations of subparallel veins and stockworks in zones as much as 100 m wide and 10 km long. They contain local concentrations of hematite/specularite, pyrite, copper sulphides, and pitchblende.
Fluid inclusions in the veins at two uranium showings, Crowfoot and Ted, were examined. The homogenization temperatures (Th) range from 96 to 217°C for Type I (2-phase liquid-rich) inclusions at Crowfoot, and from 122 to 169°C for Types I and III (3-phase liquid-rich) inclusions at Ted. Type II (2-phase vapour-rich) inclusions yield grossly different Th (228 445°C range), which do not represent true Th, but do suggest fluid mixing, as does the wide salinity range from 0.18 to 31.6 weight per cent NaCl equivalent. These data are consistent with the formation of the veins in a tensional epizonal environment.