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TitleThe evolution of metasomatic uranium ore systems in the Kitts-Post Hill belt of the Central Mineral Belt, Labrador
 
AuthorDuffett, C L; Potter, E GORCID logo; Petts, D C; Acosta-Gongóra, P; Cousens, B L; Sparkes, G W
SourceOre Geology Reviews vol. 126, 103720, 2020 p. 1-22, https://doi.org/10.1016/j.oregeorev.2020.103720
Image
Year2020
Alt SeriesNatural Resources Canada, Contribution Series 20200029
PublisherElsevier B.V.
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNewfoundland and Labrador
AreaLabrador; Canada
Lat/Long WENS -61.9736 -58.2639 55.8628 54.5847
Subjectseconomic geology; geochemistry; Science and Technology; mineral deposits; metasomatic deposits; uranium; mineralization; ore mineral genesis; tectonic setting; orogenies; shear zones; trace element geochemistry; major element geochemistry; Central Mineral Belt; Kitts-Post Hill Belt; Post Hill Group; Paleoproterozoic; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; schematic cross-sections; tables; schematic representations; photomicrographs; plots
ProgramTargeted Geoscience Initiative (TGI-5) Uranium ore systems - deep metasomatic processes
Released2020 08 14
AbstractUranium mineralization of the Kitts-Post Hill belt of the Central Mineral Belt is concentrated in the upper portion of the Post Hill Group, along a structurally complex shear zone located within the Makkovik Province of Labrador. Recent research in the CMB has highlighted regional-to deposit-scale Na, Ca-Fe, K- and K-Fe alteration, as well as local hydrothermal breccia; all characteristic of iron oxide and alkali-calcic alteration systems that host iron oxide-copper-gold (IOCG) and affiliated deposits. Least-altered uraninite grains from occurrences in Kitts-Post Hill belt contain elevated Th, Zr, Y and rare earth element (REE) contents, implying primary uranium mineralization from alkaline fluids capable of transporting high field strength elements. In quantitative LA-ICP-MS maps, remobilization of U, Pb and light-REE along grain boundaries and fractures coupled with zones of elevated Zr, and lower Th and REE contents record element leaching during alteration and/or recrystallization. In chondrite-normalized plots of uraninite, contrasting REE signatures also imply three populations along the corridor that formed at different temperatures and physico-chemical conditions. Leaching of light-REE from the uraninite grains support recent studies indicating REE signatures can be disturbed by under certain conditions while heavy-REE signatures remain intact. The inferred contrasting fluid sources, reflected in the major and trace element composition of uraninite reveal a complex fluid history, complicated by post-ore magmatism and metamorphism.
Summary(Plain Language Summary, not published)
This report summaries research on the formation of uranium mineralization of the Kitts-Post Hill belt of the Central Mineral Belt, Labrador. Recent research in the CMB has highlighted regional-to deposit-scale Na, Ca-Fe, K- and K-Fe alteration, as well as local hydrothermal breccia; all characteristic of iron oxide and alkali-calcic alteration systems that host iron oxide-copper-gold (IOCG) and affiliated deposits. Based on petrography and trace element chemistry of the mineral uraninite, the mineralization exhibits features characteristic of IOCG and affiliated deposits. However, leaching of light-REE from the uraninite grains support recent studies indicating REE signatures can be disturbed by under certain conditions while heavy-REE signatures remain intact. The inferred contrasting fluid sources, reflected in the major and trace element composition of uraninite reveal a complex fluid history, complicated by post-ore magmatism and metamorphism.
GEOSCAN ID325460

 
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