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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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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorAcosta-Góngora, P; Potter, E GORCID logo; Corriveau, LORCID logo; Lawley, C J MORCID logo; 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, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
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; Databases; Classification; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; pie charts; plots; graphs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Uranium ore systems - deep metasomatic processes
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.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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