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TitleToward the application of molybdenum and thallium isotopes as indicators of paleoredox conditions and genesis of hyper-enriched black shale (HEBS) deposits, Peel River, Yukon
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorCrawford, I; Layton-Matthews, D; Peter, J MORCID logo; Gadd, M GORCID logo; Voinot, A
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 139-161, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
File formatpdf
NTS106E/09; 106E/10; 106E/11; 106E/12; 106E/13; 106E/14; 106E/15; 106E/16; 106F/11; 106F/12; 106F/13; 106F/14; 106K/03; 106K/04; 106K/05; 106K/06; 106K/11; 106K/12; 106K/13; 106K/14; 106L; 116H/09; 116H/10; 116H/11; 116H/12; 116H/13; 116H/14; 116H/15; 116H/16; 116I
AreaPeel River; Richardson Mountains
Lat/Long WENS-138.0000 -133.0000 67.0000 65.5000
Subjectseconomic geology; geochemistry; stratigraphy; mineral deposits; nickel; molybdenum; zinc; sedimentary ore deposits; strata-bound deposits; mineral exploration; mineral potential; ore mineral genesis; mineralization; ore controls; isotopic studies; stable isotope studies; molybdenum geochemistry; thallium geochemistry; sedimentary basins; bedrock geology; lithology; sedimentary rocks; black shales; cherts; shales; clastics; silts; structural features; faults; paleoenvironment; marine environments; sea water geochemistry; depositional environment; precipitation; whole rock analyses; geochemical analyses; bulk composition; spectrometric analyses; organic geochemistry; organic carbon analyses; Richardson Trough; Yukon Stable Block; Peel Plateau; Peel Plain; Imperial Formation; Canol Formation; Road River Group; platinum group elements; Phanerozoic; Paleozoic; Devonian
Illustrationsbar graphs; location maps; geoscientific sketch maps; stratigraphic charts; tables; geochemical profiles; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Volcanogenic massive sulphide ore systems - deposition - time and space
Released2019 03 01
AbstractHyper-enriched black shale (HEBS) deposits such as those hosted in Devonian black shales of northern Yukon are a globally significant source of a variety of economically important metals, particularly nickel, copper, zinc and platinum group elements (PGE). The Yukon HEBS occurs as a thin (<10 cm) but laterally extensive (10 000s km2) stratiform and stratabound mineralized layer that is hyper-enriched in Ni-Mo-Zn-PGE. The genesis of such deposits and the ambient paleoenvironment in which they formed are the subject of vigorous debate. Non-traditional stable isotopes, particularly molybdenum and thallium, are shown to be robust paleoredox indicators. Systematic sampling with molybdenum and thallium isotopic analysis of a 200 m stratigraphic section through the Yukon HEBS mineralization and the footwall and hanging-wall strata at the Peel River north and south bank localities give delta-98Mo values of -1.1 to -0.53 permille and epsilon-205Tl values of -8.1 to -5.2 for the mineralization and 0.05 to 0.60 permille and -4.8 to -4.4 for the unmineralized strata, respectively. These values, together with bulk geochemical redox indicators and rare earth elements, indicate that the Peel River HEBS mineralization formed from seawater in a quiescent, euxinic basinal paleoenvironment.
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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