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TitleReassessment of Middle Devonian dolomite, Presqu'ile barrier, Northwest Territories
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AuthorConiglio, M; Morrow, D W; Wilson, N
SourcePotential for carbonate-hosted lead-zinc Mississippi Valley-type mineralization in northern Alberta and southern Northwest Territories: geoscience contributions, Targeted Geoscience Initiative; by Hannigan, P K (ed.); Geological Survey of Canada, Bulletin no. 591, 2006 p. 195-219, https://doi.org/10.4095/222937 (Open Access)
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Year2006
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediapaper; CD-ROM; on-line; digital
RelatedThis publication is contained in Hannigan, P K; (2006). Potential for carbonate-hosted lead-zinc Mississippi Valley-type mineralization in northern Alberta and southern Northwest Territories: geoscience contributions, Targeted Geoscience Initiative, Geological Survey of Canada, Bulletin no. 591
RelatedThis publication is contained in Hannigan, P K; (2006). Potential for carbonate-hosted lead-zinc Mississippi Valley-type mineralization in northern Alberta and southern Northwest Territories: geoscience contributions, Targeted Geoscience Initiative, Geological Survey of Canada, Bulletin no. 591
File formatpdf (Adobe® Reader® v. 6.0, is included / est fourni); pdf
ProvinceNorthwest Territories
NTS85B; 85C; 85D; 85E/01; 85E/02; 85E/03; 85E/04; 85E/05; 85E/06; 85E/07; 85E/08; 85F/01; 85F/02; 85F/03; 85F/04; 85F/05; 85F/06; 85F/07; 85F/08; 85G/01; 85G/02; 85G/03; 85G/04; 85G/05; 85G/06; 85G/07; 85G/08; 95A/01; 95A/02; 95A/07; 95A/08; 95A/09; 95A/10; 95A/15; 95A/16; 95H/01; 95H/02; 95H/07; 95H/08
Areasouth-central Northwest Territories; Great Slave Lake; Hay River; Kakisa Lake; Tathlina Lake; Mackenzie River; Pine Point
Lat/Long WENS-121.0000 -114.0000 61.5000 60.0000
Subjectssedimentology; geochemistry; Middle Devonian; hydrothermal deposits; sedimentary rocks; carbonate rocks; dolomites; sedimentary petrology; petrography; dolomitization; mineralization; paleohydrology; models; fluid inclusions; formation fluids; pore fluids; salinity; salt solution; sodium chloride; calcium chloride; chlorite; meteoric waters; fluid flow; flow regimes; structural controls; structural features; faults; faults, extension; pore structure; isotopic studies; stable isotope studies; carbon isotopes; oxygen isotopes; radioisotopes; strontium strontium ratios; thermal history; thermal analyses; heat flow; temperature; recrystallization; mineral potential; mineral deposits; Mississippi Valley deposits; lead zinc deposits; sedimentary ore deposits; lead; zinc; base metals; wells; drillholes; boreholes; core samples; diagenesis; paragenesis; calcite; limestones; alteration; precipitation; groundwater circulation; Presqu'ile Barrier; Pine Point property; Presqu'ile Dolomite; Slave Point Formation; Watt Mountain Formation; Windy Point Formation; Sulphur Point Formation; Buffalo River Formation; Muskeg Formation; Pine Point Formation; Upper Keg River Member; Lower Keg River Member; Rabbit Lake Structure; Tathlina Fault; Hay River Fault Zone; Great Slave Shear Zone; carbonate-hosted deposits; microthermometry; dolomite types; cathodoluminescence analyses; crystal mosaics; Phanerozoic; Paleozoic; Devonian
Illustrationssketch maps; schematic cross-sections; charts; tables; plots; cross-plots; graphs; photographs; photomicrographs; histograms
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
Released2006 12 21
AbstractRe-examination of the petrography and geochemistry of hydrothermal, fabric-destructive dolomite in the Pine Point area and in the subsurface to the southwest of Pine Point provides a basis for challenging the current model for dolomitization of the Presqu'ile barrier. Generally, saddle dolomite formed from high-salinity NaCl-CaCl2 fluids and records no evidence of mixing with less-saline fluids. Late-stage calcite formed from less-saline NaCl fluids, suggesting minor mixing with less-saline, perhaps meteoric fluids that penetrated into these rocks after dolomitization.
Dolomitization may be related to extensional faults in the study area and the karstic pore-system that developed in the Presqu'ile barrier. The variability in the isotopic data can be explained by temporal or spatial variations in heat flow or the degree of recrystallization as a function of fluid-rock interaction.
GEOSCAN ID222937