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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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AuthorCrawford, I; Layton-Matthews, D; Peter, J M; Gadd, M G; 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)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
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; ore systems approach; hyper-enriched black shale (HEBS); platinum group elements; redox indicators; paleoredox indicators; chemostratigraphy; rare earth element analyses; total organic carbon (TOC); Phanerozoic; Paleozoic; Devonian
Illustrationsbar graphs; location maps; geoscientific sketch maps; stratigraphic charts; tables; geochemical profiles; geochemical plots
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramVolcanogenic massive sulphide ore systems - deposition - time and space, Targeted Geoscience Initiative (TGI-5)
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.