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TitleAlkaline magmatism in the Selwyn Basin, Yukon: relationship to SEDEX mineralization
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorScanlan, E J; Leybourne, M; Layton-Matthews, D; Voinot, A; van Wagoner, N
SourceTargeted Geoscience Initiative 5: grant program final reports (2018-2020); by Targeted Geoscience Initiative Coordination Office; Geological Survey of Canada, Open File 8755, 2021 p. 265-279, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: grant program final reports (2018-2020)
RelatedThis publication is related to Textural, mineralogical, lithogeochemical and lead and thallium isotopic characterization of magmatic rocks in Selwyn Basin, Yukon: potential spatial and temporal linkages with lead-zinc mineralisation
File formatpdf
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; volcanology; tectonic setting; magmatism; volcanism; mid-ocean ridges; mantle; hydrothermal systems; alteration; weathering; bedrock geology; lithology; igneous rocks; volcanic rocks; tuffs; volcaniclastics; breccias, volcanic; sedimentary rocks; shales; cherts; textural analyses; field relations; calcite; ankerite; carbonate; zoning; precipitation; barium geochemistry; thallium geochemistry; cerium geochemistry; trace element geochemistry; major element geochemistry; isotopic studies; strontium; neodymium; lead; oxygen; carbon; barium; radiometric dating; mineralogical analyses; mass spectrometer analysis; Selwyn Basin; MacMillan Pass District; Boundary Deposit; Anvil District; Keno-Mayo District; Misty Creek Embayment; Phanerozoic; Mesozoic; Triassic; Paleozoic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; photomicrographs; plots; tables
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
Released2021 10 27
AbstractSeveral sedimentary exhalative (SEDEX) deposits have alkaline magmatism that is temporally and spatially associated to mineralization. This report outlines interim data from a study of potential linkages between magmatism and SEDEX mineralization in the Selwyn Basin, Yukon. This region is an ideal study site due to the close spatial and temporal relationships between SEDEX deposits and magmatism, particularly in the MacMillan Pass, where volcanic rocks have been drilled with mineralization at the Boundary deposit.
Alkaline volcanic samples were analysed from the Anvil District, MacMillan Pass, Keno-Mayo and the Misty Creek Embayment in the Selwyn Basin to characterise volcanism and examine the relationship to mineralization. Textural and field relationships indicate a volatile-rich explosive eruptive volcanic system in the MacMillan Pass region in comparison to the Anvil District, which is typically effusive in nature. High proportions of calcite and ankerite in comparison to other minerals are present in the MacMillan system. Cathodoluminescence imaging reveals zoning and carbonate that displays different luminescent colours within the same sample, likely indicating multiple generations of carbonate precipitation. Barium contents are enriched in volcanic rocks throughout the Selwyn Basin, which is predominately hosted by hyalophane with rare barite and barytocalcite. Thallium is positively correlated with Ba, Rb, Cs, Mo, As, Sb and the calcite-chlorite-pyrite index and is negatively correlated with Cu. Anvil District samples display a trend towards depleted mid-ocean ridge mantle on a plot of Ce/Tl versus Th/Rb. Hydrothermal alteration has likely led to the removal of Tl from volcanic rocks in the region.
Ongoing research involves: i) the analysis of Sr, Nd, Pb and Tl isotopes of volcanic samples; ii) differentiating magmatic from hydrothermal carbonate using O, C and Sr isotopes; iii) examining sources of Ba in the Selwyn Basin; iv) and constraining age relationships through U-Th-Pb geochronology.
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 TGI Grant Recipients 2018-2020.

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