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TitleWhole-rock lithogeochemistry, Nd-Hf isotopes, and in situ zircon geochemistry of VMS-related felsic rocks, Finlayson Lake VMS district, Yukon
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorManor, M J; Piercey, S JORCID logo
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. 251-264, 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)
File formatpdf
NTS105G/01; 105G/02; 105G/07; 105G/08; 105G/09; 105G/10
AreaFire Lake; Wolverine Lake
Lat/Long WENS-131.0000 -130.0000 61.5500 61.0833
Subjectseconomic geology; geochemistry; stratigraphy; tectonics; Science and Technology; Nature and Environment; mineral exploration; mineral deposits; volcanogenic deposits; sulphide deposits; polymetallic ores; ore mineral genesis; mineralization; ore controls; lithogeochemistry; isotopic studies; neodymium; hafnium; uranium thorium ratios; geochemical analyses; whole rock geochemistry; trace element geochemistry; zircon; tectonic history; magmatism; volcanism; intrusions; stratigraphic analyses; lithofacies; chronostratigraphy; bedrock geology; lithology; metamorphic rocks; felsic rocks; structural features; faults; petrogenesis; models; thermal history; fluid flow; crustal evolution; tectonic evolution; Canadian Cordillera; Yukon-Tanana Terrane; Finlayson Lake District; Slide Mountain Terrane; Grass Lakes Group; Fire Lake Formation; Kudz Ze Kayah Formation; Wind Lake Formation; Grass Lakes Plutonic Suite; Wolverine Lake Group; Cleaver Lake Thrust Sheet; Phanerozoic; Paleozoic; Carboniferous; Mississippian; Devonian
Illustrationsgeoscientific sketch maps; plots
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
Released2021 10 27
AbstractThe Finlayson Lake district in southeastern Yukon is composed of a Late Paleozoic arc-backarc system that consists of metamorphosed volcanic, plutonic, and sedimentary rocks of the Yukon-Tanana and Slide Mountain terranes. These rocks host >40 Mt of polymetallic resources in numerous occurrences and styles of volcanogenic massive sulphide (VMS) mineralization. Geochemical and isotopic data from these rocks support previous interpretations that volcanism and plutonism occurred in arc-marginal arc (e.g., Fire Lake formation) and continental back-arc basin environments (e.g., Kudz Ze Kayah formation, Wind Lake formation, and Wolverine Lake group) where felsic magmatism formed from varying mixtures of crust- and mantle-derived material. The rocks have elevated high field strength element (HFSE) and rare earth element (REE) concentrations, and evolved to chondritic isotopic signatures, in VMS-proximal stratigraphy relative to VMS-barren assemblages. These geochemical features reflect the petrogenetic conditions that generated felsic rocks and likely played a role in the localization of VMS mineralization in the district. Preliminary in situ zircon chemistry supports these arguments with Th/U and Hf isotopic fingerprinting, where it is interpreted that the VMS-bearing lithofacies formed via crustal melting and mixing with increased juvenile, mafic magmatism; rocks that were less prospective have predominantly crustal signatures. These observations are consistent with the formation of VMS-related felsic rocks by basaltic underplating, crustal melting, and basalt-crustal melt mixing within an extensional setting. This work offers a unique perspective on magmatic petrogenesis that underscores the importance of integrating whole-rock with mineral-scale geochemistry in the characterization of VMS-related stratigraphy.
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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