The Evolution of Metasomatic Uranium Ore Systems in the Central Mineral Belt of Labrador
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- Pedro Acosta-Gongora (Co-author)
- Brian Cousens (Co-author)
- Greg Sparkes (Co-author)
- Duane Petts (Co-author)
- Eric Potter (Co-author)
- Abstract
In quantitative LA-ICP-MS maps of uraninite from the Kitts-Post Hill belt in Central Labrador, remobilization of U and LREE along grain boundaries/fractures support the varying degrees of alteration recorded in major/trace element chemistry. Primary uraninite contains elevated Th, Zr, and REE contents implying crystallization from high-temperature fluids capable of transporting HFSE. Altered grains are characterized by elevated Zr, low Th and low REE contents, indicating potential remobilization in response to regional tectonic-magmatic events. In chondrite-normalized plots of uraninite, contrasting REE signatures imply three populations, formed under different temperatures/physico-chemical conditions. Magnetite geochemistry reveals at least two events, characterized by both magmatic-like V contents, and hydrothermal Ni/Cr ratios. The inferred contrasting fluid sources, reflected in the major/trace element compositions, reveal a fluid history complicated by post-ore magmatism and metamorphism. Potential syn-uranium mineralization hydrothermal zircon grains from the Kitts and Gear deposits were analyzed by SHRIMP and record isotopic re-setting ca. 1800 Ma.
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Copyright © 2019 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2019
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duffett-theevolutionofmetasomaticuraniumoresystems-supplemental.zip | 2023-05-05 | Public | Download |