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TitleLithogeochemical and sulphur isotope indicators of environment of formation and genesis of the Moss hyper-enriched black shale showing, Yukon
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AuthorGadd, M G; Peter, J M; Fraser, T A; Layton-Matthews, D
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 163-178, (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
AreaRichardson Mountains
Lat/Long WENS-138.0000 -133.0000 67.0000 65.5000
Subjectseconomic geology; geochemistry; stratigraphy; mineral deposits; nickel; molybdenum; zinc; platinum; palladium; gold; iron; sulphides; sedimentary ore deposits; strata-bound deposits; mineral exploration; mineral potential; ore mineral genesis; mineralization; ore controls; lithogeochemistry; isotopic studies; stable isotope studies; sulphur isotope ratios; sulphur geochemistry; sedimentary basins; bedrock geology; lithology; sedimentary rocks; black shales; cherts; shales; silts; structural features; faults; paleoenvironment; sedimentary environments; marine environments; sea water geochemistry; depositional environment; sedimentation; clastics; precipitation; whole rock analyses; geochemical analyses; bulk composition; spectrometric analyses; organic geochemistry; organic carbon analyses; paleogeography; Richardson Trough; Moss showing; Yukon Stable Block; Imperial Formation; Canol Formation; Road River Group; ore systems approach; hyper-enriched black shale (HEBS); platinum group elements; rhenium; chemostratigraphy; rare earth element analyses; total organic carbon (TOC); Phanerozoic; Paleozoic; Devonian
Illustrationsgeoscientific sketch maps; schematic sections; tables; geochemical plots; geochemical profiles
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
AbstractThe Moss Ni-Mo-Zn-Pt-Pd-Re-Au hyper-enriched black shale (HEBS) showing is located in the western Richardson Mountains and is one of several in northern Yukon. The mineralization consists of a thin, stratiform semi-massive Fe-Ni-Mo-Zn sulphide horizon that occurs at the stratigraphic contact between the Road River Group and Canol Formation. This study evaluates the ambient paleoenvironmental conditions using several robust lithogeochemical proxies. Prior to HEBS formation, terrigenous clastic sedimentation predominated, whereas chemical sedimentation pre-dominated during and immediately after HEBS formation. Rare earth element-Y data indicate that the water column was (weakly) oxygenated (Ce/Ce*SN < 1), that hydrothermal activity was absent (Eu/Eu*SN almost equal to 1), and that there was a significant seawater influence on the sedimentary environment (Y/Ho > 28) throughout the deposition interval, even during HEBS mineralization.
High (>10) authigenic Mo/U ratios suggest that a ferromanganese particulate shuttle delivered metals sourced from seawater to the seafloor. Negative bulk delta-34S values (-19.3 to -23 permille) in the HEBS indicate that microbially reduced seawater sulphate was the source of reduced sulphur for the mineralization. Collectively, these data signify a basinal environment that experienced varying degrees of restriction and stratification, but fresh (i.e. unfractionated) marine waters delivered metals, metalloids, and sulphur. This type of geological setting is considered critical for the formation and preservation of HEBS mineralization.