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TitleGeochemistry of U±Cu±Mo±V mineralization, Central Mineral Belt, Labrador: differentiating between mineralization styles using a principal component analysis approach
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AuthorAcosta-Góngora, P; Potter, E G; Corriveau, L; Lawley, C J M; Sparkes, G W
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 381-391, https://doi.org/10.4095/313673 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
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
ProvinceNewfoundland and Labrador
NTS13J/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
AreaLabrador; Jacques Lake; Moran Lake; Anna Lake; Snegamook Lake; Kanairiktok River
Lat/Long WENS -62.7000 -58.9500 55.3833 54.0500
Subjectseconomic geology; geochemistry; mathematical and computational geology; mineral deposits; mineral occurrences; uranium; copper; molybdenum; vanadium; arsenic; mineral exploration; ore mineral genesis; mineralization; mineral enrichment; hydrothermal alteration; metasomatism; statistical analyses; host rocks; bedrock geology; lithology; metamorphic rocks; tectonic history; Archean; Central Mineral Belt; Central Mineral Belt Uranium Geochemistry Database (CMBUG); Jacques Lake Deposit; Michelin Deposit; Two Time Zone-Snegamook Deposit; Moran Lake C Zone Deposit; Anna Lake Deposit; Kanairiktok Deposit; Moran Lake Group; Post Hill Group; Nain Craton; Bruce River Group; Seal Lake Group; Mesoproterozoic; Paleoproterozoic; ore systems approach; iron-oxide-copper-gold (IOCG) deposits; principal component analysis; databases; geochemical signatures; classification; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; pie charts; plots; graphs
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramUranium ore systems - deep metasomatic processes, Targeted Geoscience Initiative (TGI-5)
Released2019 03 01
AbstractThe 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