Proposed Title 1: - Queen's University
Proposed Title 1: - Queen's University Proposed Title 1: - Queen's University
Bolger open pit, Beaverlodge area, Northern Saskatchewan, Canada. ii
Abstract Uranium deposits associated with Paleoproterozoic successor basins were investigated using structural, petrographic, geochronological and geochemical relationships to understand the character and timing of ore-forming fluids and the structural control on uranium mineralization. The work focused on two successor basins that share similar geological characteristics: the Martin Lake Basin in the Beaverlodge area in Canada, and the El Sherana Basin in the South Alligator River area in Australia. The Beaverlodge area records six temporally distinct stages of U mineralization spatially associated with the Martin Lake successor basin. Early minor stages are hosted in cataclasite and veins at ca. 2.29 Ga and in albitized granite in the Gunnar deposit between ca. 2.3 Ga and 1.9 Ga, which predates the main stage of U mineralization of hydrothermal breccias that formed at ca. 1.85 Ga. Later stages of mineralization are related to minor veins at ca. 1.82 Ga linked to alkaline mafic dikes associated with the Martin Lake Basin and to minor veins at ca. 1.62 Ga corresponding to the timing of unconformity-type U mineralization in the overlying Athabasca Basin. The main breccia-type U mineralizing event that affected all deposits in the Beaverlodge area formed at ca. 1.85 Ma from metamorphic fluids at ca. 330 o C linked to metasomatism during regional metamorphism of the Trans-Hudson Orogen. The ore-forming fluids were likely derived from metamorphic remobilization of pre-existing U-rich basement rocks, and ascended upward along deep fracture systems that resulted from brittle reactivation of early ductile shear zones. The main event of U mineralization in the South Alligator River area formed at ca. 1.82 Ma, subsequent to deposition of the El Sherana Group at 1.84-1.83 Ma. The formation iii
- Page 1: FLUID EVOLUTION AND STRUCTURAL CONT
- Page 5 and 6: Co-Authorship This thesis and the m
- Page 7 and 8: Sarah Rice and Jonathan Cloutier, a
- Page 9 and 10: TABLE OF CONTENTS Abstract………
- Page 11 and 12: 2.5.2. Temporal relationships of fa
- Page 13 and 14: 4.5.3. Isotopic compositions of min
- Page 15 and 16: List of Figures Figure 1.1. General
- Page 17 and 18: Figure 4.16. Distribution of 207 Pb
- Page 19 and 20: Table 4.4. Isotopic data of the U-P
- Page 21 and 22: processes by which these deposits f
- Page 23 and 24: Figure 1.1. Generalized geological
- Page 25 and 26: which is the equivalent of the Mill
- Page 27 and 28: dolostone and carbonaceous shale (L
- Page 29 and 30: Mineral Field (Figure 1.2). Many de
- Page 31 and 32: 2005). U mineralization is controll
- Page 33 and 34: Figure 1.4. Schematic representatio
- Page 35 and 36: In particular, the key issues to be
- Page 37 and 38: genetic model for the U mineralizat
- Page 39 and 40: fourth and most significant uranium
- Page 41 and 42: The Beaverlodge area is part of the
- Page 43 and 44: 1998; Hartlaub and Ashton, 1998). R
- Page 45 and 46: (D 1 ) produced a regional migmatit
- Page 47 and 48: These previous age models do not ta
- Page 49 and 50: the age when the concentrations of
- Page 51 and 52: Figure 2.3. A: Detailed geologic ma
Bolger open pit, Beaverlodge area, Northern Saskatchewan, Canada.<br />
ii
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