| Title | Whole-rock lithogeochemistry, Nd-Hf isotopes, and in situ zircon geochemistry of VMS-related felsic rocks, Finlayson Lake VMS district, Yukon |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Manor, M J; Piercey, S J |
| Source | Targeted 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, https://doi.org/10.4095/328992  Open Access |
| Year | 2021 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative 5: grant program final reports (2018-2020) |
| File format | pdf |
| Province | Yukon |
| NTS | 105G/01; 105G/02; 105G/07; 105G/08; 105G/09; 105G/10 |
| Area | Fire Lake; Wolverine Lake |
| Lat/Long WENS | -131.0000 -130.0000 61.5500 61.0833 |
| Subjects | economic 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 |
| Illustrations | geoscientific sketch maps; plots |
| Program | Targeted Geoscience Initiative (TGI-5) Knowledge Management Coordination |
| Released | 2021 10 27 |
| Abstract | The 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. |
| GEOSCAN ID | 328992 |
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