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TitreReconnaissance molybdenum isotope study of vent-distal SEDEX zinc-lead mineralization and host rocks in the Howard's Pass district, Selwyn Basin, Yukon: potential application to paleoredox determinations
TéléchargerTéléchargement (publication entière)
AuteurPeter, J M; Gadd, M G; Layton-Matthews, D; Voinot, A
SourceTargeted Geoscience Initiative: 2018 report of activities; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8549, 2019 p. 105-123, https://doi.org/10.4095/313645 (Accès ouvert)
Année2019
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/313645
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
SNRC105I
Lat/Long OENS-130.0000 -128.0000 63.0000 62.0000
Sujetsgisements minéraux; zinc; plomb; gîtes sédimentaires; zone d'éruption volcanique; gîtes volcano-sédimentaires; gisements minéraux hydrothermaux; prospection minière; potentiel minier; genèse des minerais; minéralisation; contrôles des minerais; système hydrothermal; milieux marins; composition en vrac; analyses géochimiques; etudes isotopiques; études des isotopes stables; géochimie du molybdène; géologie du substratum rocheux; lithologie; roches sédimentaires; mudstones; schistes; grès; chailles; carbonates; dolomites; calcaires; roches ignées; roches volcaniques; couches volcano-sédimentaires; sulfures; roches intrusives; monzonites; granites; roches hôtes; analyse par spectromètre de masse; analyses de carottes de sondage; Bassin de Selwyn ; Groupe de Road River ; Formation de Duo Lake ; Groupe d'Earn ; Plate-Forme de Mackenzie ; géologie économique; géochimie; stratigraphie; Phanérozoïque; Mésozoïque; Crétacé; Trias; Paléozoïque; Carbonifère; Dévonien; Silurien; Ordovicien; Cambrien; Précambrien; Protérozoïque
Illustrationsschematic models; bar graphs; geoscientific sketch maps; stratigraphic charts; photographs; 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)
Recent work on the largest sedimentary exhalative (SEDEX) district in Canada, the Howard's Pass district (HPD) in Selwyn Basin, Yukon, has shown that a persistently euxinic water column was not the source of sulphur in the mineralization, and that the redox conditions of the water column (and shallow subsurface) varied from anoxic to suboxic to euxinic. We have conducted a bulk geochemical and molybdenum isotopic traverse through a mineralized intersection in a single drill hole from the Anniv East vent-distal lead-zinc SEDEX deposit in the HPD. Bulk geochemical redox proxies generally show that redox conditions varied between (intermittently to permanently) suboxic, dysoxic, anoxic and euxinic. Herein we present new molybdenum isotope data for these same samples, and evaluate the efficacy of the application of this isotopic system to determining redox conditions of the water column and shallow subsurface, and examine the utility of molybdenum isotopes in providing genetic information for SEDEX deposits.
Molybdenum isotope values range from delta-98Mo -0.29 to 2.27 permille. There is good general agreement between the molybdenum isotope values and certain redox sensitive elements and established redox indicators for the unmineralized and mineralized host rocks; these relationships reflect suboxic or oxic conditions for the most negative values, and anoxic and euxinic conditions for the most positive values. This indicates that the application of molybdenum isotopes as a redox indicator in seafloor hydrothermal deposits in sedimentary (or volcano-sedimentary) settings shows great promise. Unlike thallium isotopes, molybdenum isotopes do not appear to be of use in fingerprinting SEDEX mineralization.
GEOSCAN ID313645