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TitreLithogeochemical and sulphur isotope indicators of environment of formation and genesis of the Moss hyper-enriched black shale showing, Yukon
TéléchargerTéléchargement (publication entière)
AuteurGadd, M G; Peter, J M; Fraser, T A; Layton-Matthews, D
SourceTargeted Geoscience Initiative: 2018 report of activities; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8549, 2019 p. 163-178, https://doi.org/10.4095/313648 (Accès ouvert)
Année2019
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/313648
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Commission géologique du Canada, Dossier public 8549
Formatspdf
ProvinceYukon
SNRC106E/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
Lat/Long OENS-138.0000 -133.0000 67.0000 65.5000
Sujetsgisements minéraux; nickel; molybdène; zinc; platine; palladium; or; fer; sulfures; gîtes sédimentaires; gîtes stratoïdes; prospection minière; potentiel minier; genèse des minerais; minéralisation; contrôles des minerais; lithogéochimie; etudes isotopiques; études des isotopes stables; rapports des isotopes de soufre; géochimie du soufre; bassins sédimentaires; géologie du substratum rocheux; lithologie; roches sédimentaires; ampélites; chailles; schistes; silts; caractéristiques structurales; failles; paléoenvironnement; milieux sédimentaires; milieux marins; géochimie de l'eau de mer; milieu sédimentaire; sedimentation; roches clastiques; précipitation; analyses des roches totales; analyses géochimiques; composition en vrac; analyses spectrométriques; géochimie organique; analyses de carbone organique; paléogéographie; Bloc stable du Yukon; Formation d'Imperial ; Formation de Canol ; Groupe de Road River ; éléments du groupe de platine; géologie économique; géochimie; stratigraphie; Phanérozoïque; Paléozoïque; Dévonien
Illustrationsgeoscientific sketch maps; schematic sections; tables; geochemical plots; geochemical profiles
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes minéralisés de sulfure massif volcanogénique - déposition - temps et espace, Initiative géoscientifique ciblée (IGC-5)
Diffusé2019 03 01
Résumé(disponible en anglais seulement)
The 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.
GEOSCAN ID313648