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TitleTextural, mineralogical, lithogeochemical and lead and thallium isotopic characterization of magmatic rocks in Selwyn Basin, Yukon: potential spatial and temporal linkages with lead-zinc mineralisation
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorScanlan, E J; Leybourne, M I; Layton-Matthews, D; Voinot, A; Van Wagoner, N A
SourceTargeted Geoscience Initiative 5, Grant Program interim reports 2018-2019; by Benn, D; Brenan, J MORCID logo; Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, DORCID logo; Moynihan, D P; Mungall, J E; Nixon, G T; Padget, C D W; Pattison, D R M; Rempel, K U; Scanlan, E J; Scoates, J S; Tsay, A; Voinot, A; Van Wagoner, N A; Weston, R; Williams-Jones, A E; Woods, K; Zajacz, Z; Geological Survey of Canada, Open File 8620, 2019 p. 19-42, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5, Grant Program interim reports 2018-2019
RelatedThis publication is related to Alkaline magmatism in the Selwyn Basin, Yukon: relationship to SEDEX mineralization
File formatpdf (Adobe® Reader®)
NTS95C; 95D; 95E; 105; 106B; 106C; 106D
Lat/Long WENS-136.0000 -124.0000 65.0000 60.0000
Subjectseconomic geology; mineralogy; geochemistry; geochronology; tectonics; Science and Technology; mineral deposits; lead; zinc; ore mineral genesis; mineralization; bedrock geology; lithology; sedimentary rocks; shales; cherts; igneous rocks; volcanic rocks; mafic volcanic rocks; basalts; metamorphic rocks; metavolcanic rocks; textural analyses; lithogeochemistry; isotopic studies; lead geochemistry; thallium geochemistry; mass spectrometer analysis; scanning electron microscope analyses; radiometric dating; lead lead dates; zircon dates; petrographic analyses; alkalinity; tectonic setting; magmatism; volcanism; intrusions; dykes, mafic; alteration; deformation; ankerite; calcite; thallium geochemistry; barium geochemistry; Selwyn Basin; MacMillan Pass District; Anvil District; Keno Hill District; Misty Creek Embayment; Earn Group; Marmot Volcanics; Phanerozoic; Mesozoic; Triassic; Paleozoic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; photographs; photomicrographs; plots; ternary diagrams; bar graphs; tables
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
Released2019 08 29
AbstractAlkaline to subalkaline magmatic rocks in the Selwyn Basin, Yukon may provide evidence of a genetic link to clastic sediment-hosted Pb-Zn deposits in the Anvil and MacMillan Pass districts. To examine if such a link is present, we document the petrography, lithogeochemical, and thallium isotopic compositions of magmatic rocks in these regions. Anvil District volcanic rocks are interpreted as basaltic effusive eruptions and phreatomagmatic surge and/or fall deposits, whereas samples from the MacMillan Pass district were emplaced by explosive eruptive activity. The MacMillan Pass samples contain large amounts of ankerite and calcite. Earn Group metavolcanic rocks from the Keno Hill area have few primary textures to identify eruption dynamics. This group is crosscut by a series of Triassic mafic dikes that exhibit little alteration or deformation. Samples of Marmot Volcanics from the Misty Creek Embayment are effusive basalts. Magmatism is alkaline in all regions except for Keno Hill, where both the Earn Group metavolcanic rocks and Triassic dikes are subalkaline. Six samples from the MacMillan Pass District have epsilon-205Tl values of -3.2 ± 1.8 to -14.2 ± 3.2. Five samples from the Anvil District have epsilon-205Tl values of 0.9 ± 1.9 to -6.4 ± 1.2. These preliminary data will be supplemented with additional analyses of mineralised horizons and host shales to investigate the link between high Ba and Tl contents in both the volcanic rocks and SEDEX deposits. Future work will constrain age relationships between mineralized samples and volcanism, use Pb, Sr and Nd to constrain magma sources and use Tl, Mo and potentially Ba isotopes to examine the link between mineralisation and magmatism.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques, which will result in more effective targeting of buried mineral deposits. This compendium is the result of the Grant Recipients 2018-2019.

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