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TitleSelwyn Basin magmatism and relationship to sediment-hosted Zn-Pb deposits
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLeybourne, M I; Van Wagoner, N; Paradis, SORCID logo; 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 logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 2
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 of America
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; Phanerozoic; Paleozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs; plots; ternary diagrams; bar graphs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems
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.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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