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TitreGeochemistry of U±Cu±Mo±V mineralization, Central Mineral Belt, Labrador: differentiating between mineralization styles using a principal component analysis approach
TéléchargerTéléchargement (publication entière)
LicenceVeuillez noter que la Licence du gouvernement ouvert - Canada remplace toutes les licences antérieures.
AuteurAcosta-Góngora, P; Potter, E G; Corriveau, L; Lawley, C J M; Sparkes, G W
SourceTargeted Geoscience Initiative: 2018 report of activities; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8549, 2019 p. 381-391, https://doi.org/10.4095/313673 (Accès ouvert)
Année2019
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/313673
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
ProvinceTerre-Neuve-et-Labrador
SNRC13J/02; 13J/03; 13J/04; 13J/05; 13J/06; 13J/07; 13J/10; 13J/11; 13J/12; 13J/13; 13J/14; 13J/15; 13K; 13L/01; 13L/02; 13L/07; 13L/08; 13L/09; 13L/10; 13L/15; 13L/16; 13M/01; 13M/02; 13N/01; 13N/02; 13N/03; 13N/04; 13O/02; 13O/03; 13O/04
Lat/Long OENS -62.7000 -58.9500 55.3833 54.0500
Sujetsgisements minéraux; gîtes minéralogiques; uranium; cuivre; molybdène; vanadium; arsenic; prospection minière; genèse des minerais; minéralisation; enrichissement des minéraux; altération hydrothermale; métasomatose; analyses statistiques; roches hôtes; géologie du substratum rocheux; lithologie; roches métamorphiques; antécédents tectoniques; Archéen; Ceinture de Central Mineral ; Dépôt de Michelin ; Groupe de Moran Lake ; Craton de Nain ; Groupe de Bruce River ; Groupe de Seal Lake ; Mésoprotérozoïque; Paléoprotérozoïque; base de données; classification; géologie économique; géochimie; géomathématique; Précambrien; Protérozoïque
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; pie charts; plots; graphs
ProgrammeInitiative géoscientifique ciblée (IGC-5), Gestion de la connaissance de IGC
ProgrammeInitiative géoscientifique ciblée (IGC-5), Systèmes minéralisés d'uranium - processus métasomatiques en profondeur
Diffusé2019 03 01
Résumé(disponible en anglais seulement)
The Central Mineral Belt, Labrador, has experienced intermittent uranium exploration since the late 1950s. It hosts multiple U±Cu±Mo±V showings, prospects and deposits in Neoarchean to Mesoproterozoic meta-igneous and -sedimentary rocks. Uranium mineralization occurs in metasomatic (albitite-hosted), magmatic- and magmatic hydrothermal-related (e.g. iron-oxide-carbonate-rich veins and breccias) and sedimentary-hosted (e.g. unconformity-related) systems.
In this contribution, we use the IOCG discrimination-alteration diagram and apply principal component analysis (PCA) to characterize hydrothermal alteration and ore element signatures at uranium occurrences included within the Central Mineral Belt Uranium Geochemistry database. Our results indicate that sodium and Na-Ca-Fe-(Mg) metasomatism is more pervasive and regionally widespread than previously reported, and commonly hosts uranium mineralization; albitization itself may not be directly associated with uranium mineralization. Other second-order factors (e.g. proximity to structures) are more likely to control uranium enrichment.
In the Jacques Lake and Michelin deposits and Two Time-Snegamook trend, uranium-mineralized samples yield positive PC2 scores and occur with Na- and Na-Ca-Fe-(Mg)-altered rocks. Our analysis also documents that PC3 represents a proxy for a second style of U-As-Mo mineralization that is better defined in basalt-argillite-hosted systems (e.g. Moran Lake Upper C zone and Anna Lake deposits). The unusual U-As-Mo hydrothermal fingerprint may indicate: i) a synsedimentary origin of uranium (i.e. U-rich black shales) that was remobilized to upper stratigraphic levels; and/or ii) argillitic and basaltic packages within the Moran Lake and Post Hill groups served as redox traps for oxidizing uranium-rich fluids that equilibrated with these rocks.
GEOSCAN ID313673