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TitleSelwyn Basin magmatism and relationship to sediment-hosted Zn-Pb deposits
DownloadDownload (whole publication)
AuthorLeybourne, M I; Van Wagoner, N; Paradis, S; Layton-Matthews, D; Moertle, J A
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 2; by Rogers, N (ed.); Geological Survey of Canada, Open File 8373, 2018 p. 71-92, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 2, Geological Survey of Canada, Open File 8373
File formatpdf
ProvinceYukon; Northwest Territories; British Columbia
NTS82; 83; 85; 86; 87A; 87B; 92P; 93; 94; 95; 96; 97; 104; 105; 106; 107; 115; 116; 117
AreaMacMillan Pass District; Keno Hill District; Anvil District; Alaska; Canada; United States
Lat/Long WENS-150.0000 -114.0000 71.0000 49.0000
Subjectseconomic geology; tectonics; igneous and metamorphic petrology; geochemistry; geochronology; mineral deposits; mineral exploration; mineral potential; modelling; metals; zinc; lead; sedimentary ore deposits; sulphide deposits; volcanogenic deposits; ore mineral genesis; mineralization; ore controls; sedimentary basins; tectonic setting; magmatism; thermal history; intrusions; dykes; hydrothermal systems; hydrothermal alteration; bedrock geology; lithology; sedimentary rocks; shales; carbonates; cherts; igneous rocks; volcanic rocks; alkalinity; geochemical analyses; barium geochemistry; cesium geochemistry; niobium geochemistry; thorium geochemistry; thallium geochemistry; isotopic studies; strontium; carbon; oxygen; radiometric dating; uranium lead dating; mass spectrometer analysis; petrographic analyses; field relations; lithogeochemistry; major element analyses; trace element analyses; lead isotope ratios; Selwyn Basin; Mackenzie Platform; Misty Creek Embayment; Canol Formation; Fossil Creek Volcanics; Howard Pass Deposit; Tintina Fault; ore systems approach; sedimentary exhalative massive sulphide deposits (SEDEX); volatiles; atomic emission spectroscopy; rare earth element analyses; volcanogenic massive sulphide deposits (VMS); Phanerozoic; Paleozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs; plots; ternary diagrams; bar graphs
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramVolcanic and sedimentary systems, Targeted Geoscience Initiative (TGI-5)
Released2018 03 01
AbstractPaleozoic volcanic and intrusive rocks from the Selwyn Basin are being investigated to establish if there is genetic relationship between volcanism and sediment-hosted massive sulphide (SEDEX) mineralization with the aim of improving mineral exploration models. The spatial and temporal distribution of dominantly highly alkalic magmatism and SEDEX deposits in the Selwyn Basin are similar, but traditional models for SEDEX deposit formation have excluded any role of magmatism in their genesis. This study is testing whether magmatic systems supply heat and possibly metals and/or volatiles to the ore system. Herein we report preliminary petrological and geochemical data for samples from the Keno Hill, Anvil and MacMillan Pass districts, and Misty Creek Embayment.
Most of the volcanic rocks in the Anvil and MacMillan Pass districts are alkalic and mafic, although Paleozoic volcanic rocks and later dykes in the Keno Hill district are subalkalic. Significantly, most volcanic rocks in all districts are enriched to highly enriched in Ba, Cs, Nb and Th, and show a positive relationship between barium and thallium, similar to the Howards Pass SEDEX deposit, suggesting either the volcanic rocks have been altered by similar hydro-thermal fluids as those that generated SEDEX mineralization or that the volcanic rocks formed from magmas that may have contributed metals and metalloids (e.g. Ba, Tl) to ore-forming magmatic-hydrothermal fluids. Thallium, strontium, carbon and oxygen isotopic analysis, combined with U-Pb dating are planned to constrain the connections between alkalic volcanism and SEDEX formation in the Selwyn Basin.