Proposed Title 1: - Queen's University
Proposed Title 1: - Queen's University Proposed Title 1: - Queen's University
Chemical Pb Age (Ma) Figure 3.5. Content of substituting elements in uraninite as function of the chemical Pb age of different generations of uraninite in U deposits in the Beaverlodge area. Arrow indicates the effect of alteration by later fluids. The most altered samples are those of the granite-related metasomatic-type U 3 uraninite from the Gunnar deposit (Fig. 3.5). In U 3 uraninite, the concentration of PbO is the lowest and the total Ca+Fe+Si the highest, reflecting a higher degree of postmineralization alteration that has affected U 3 uraninite subsequent to its formation. U 3 uraninite has high P 2 O 5 and Y 2 O 3 contents. In contrast, U 4 uraninite from the breccia-type mineralization is less altered than U 3 uraninite. The concentration of UO 2 in U 4 uraninite varies from 73.23 to 78.93 weight percent and PbO contents range from 8.71 to 19.45 weight percent (Table 3.1). The chemical composition of well-preserved breccia-type U 4 uraninite indicates elevated MnO, Y 2 O 3 , SO 3 , and ThO contents (Table 3.1). Other elements present within the U 4 uraninite structure include CaO, SiO 2 , FeO, and TiO 2 (Table 3.1). The concentration of UO 2 in Br 1 brannerite from the breccia-type 97
mineralization varies from 25.70 to 42.40 weight percent and TiO 2 contents vary inversely, from 52.90 to 13.36 weight percent. Br 1 brannerite contains also several weight percent of CaO, FeO, SiO 2, PbO (Table 3.1), and anomalous levels of V 2 O 3, MnO, P 2 O 5 , SO 3 , ThO, and Y 2 O 3 (Table 3.1) . The presence of these elements in Br 1 brannerite is likely a result of post-precipitation alteration involving oxidation and partial hydration of the mineral (Smith, 1984). Volcanic-type U 5 uraninite has high contents of MnO, V 2 O 3 , and TiO 2 (Table 3.1). The high TiO 2 content is consistent with the presence of Ttn 3 titanite intergrown with U 5 uraninite. The concentration of UO 2 varies from 70.31 to 76.1 weight percent (Table 3.1). The Pb contents are variable ranging from 0.85 to 20.40 weight percent. There are high Ca, Si, and Fe contents within the U 5 uraninite structure. Athabasca-type U 6 uraninite contains the highest concentrations of P 2 O 5 (Table 3.1). V 2 O 3 and MnO also are present in variable amounts. Sample ID UO 2 SiO 2 CaO Fe 2O 3 TiO 2 Cr 2O 3 V 2O 5 PbO P 2O 5 K 2O ThO 2 SO 2 MnO Y 2O 3 Tb 2O 3 CuO Total Early tensional vein-type U 2 mineralization 6122_Pt21 71.83 2.02 3.61 0.39 0.40 0.02 0.11 17.88 0.02 0.03 0.02 0.05 0.12 0.00 0.14 0.03 96.50 6122_Pt22 54.29 0.64 11.73 1.29 0.39 0.04 0.16 15.31 0.01 0.00 0.04 0.04 0.10 0.03 0.06 0.01 83.99 6122_Pt31 73.07 3.05 3.44 0.91 0.38 0.05 0.03 14.52 0.04 0.09 0.01 0.02 0.15 0.07 0.11 0.07 95.90 6122_Pt4_1 37.29 0.69 39.21 0.44 0.13 0.01 0.04 7.66 0.11 0.04 0.04 0.09 0.50 0.00 0.08 0.02 86.03 6122_Pt4_2 72.61 0.59 3.33 0.31 0.65 0.02 0.04 17.42 0.03 0.02 0.02 0.03 0.18 0.04 0.02 0.00 95.29 6122_Pt5_1 71.65 0.46 2.32 0.11 0.38 0.04 0.05 19.91 0.02 0.05 0.00 0.01 0.07 0.09 0.01 0.02 95.09 6122_Pt92 78.10 1.92 3.38 0.95 2.58 0.03 0.17 7.11 0.05 0.05 0.00 0.02 0.43 0.02 0.00 0.04 94.74 6122_Pt101 73.63 9.89 2.48 1.14 1.35 0.28 0.23 1.90 0.36 0.05 0.01 0.03 0.36 0.08 0.20 0.05 91.80 Granite related metasomatic-type U 3 mineralization at the Gunnar deposit 6134pt21 77.59 3.01 5.35 0.15 0.06 0.01 0.04 0.07 0.12 0.14 0.01 0.01 0.02 0.02 0.07 0.04 86.61 6134pt22 80.25 3.04 5.60 0.22 0.03 0.01 0.09 0.12 0.00 0.08 0.03 0.00 0.08 0.04 0.06 0.04 89.46 6134pt23 78.63 3.65 5.19 1.65 0.33 0.01 0.06 0.00 0.06 0.07 0.02 0.02 0.06 0.00 0.07 0.12 89.78 6134pt24 78.36 3.72 5.28 1.82 0.44 0.05 0.02 0.03 0.06 0.06 0.05 0.02 0.05 0.01 0.05 0.02 89.84 6134pt3 77.88 4.95 5.57 0.19 0.37 0.01 0.01 0.11 0.05 0.07 0.03 0.01 0.09 0.01 0.08 0.01 89.33 6134pt31 79.27 3.95 5.52 0.15 0.01 0.03 0.04 0.11 0.08 0.08 0.04 0.01 0.03 0.00 0.04 0.02 89.22 6134pt32 81.64 3.39 4.56 0.16 0.00 0.12 0.07 0.03 0.05 0.06 0.04 0.00 0.07 0.03 0.08 0.05 90.13 6134pt33 79.50 3.78 5.54 0.11 0.06 0.04 0.02 0.06 0.09 0.06 0.02 0.00 0.04 0.00 0.06 0.01 89.23 6134pt41 80.77 3.52 5.67 0.23 0.01 0.01 0.00 0.13 0.01 0.07 0.03 0.01 0.09 0.04 0.01 0.04 90.57 6134pt42 79.52 3.13 5.90 0.26 0.13 0.01 0.03 0.09 0.07 0.05 0.00 0.03 0.07 0.00 0.03 0.01 89.31 6134pt43 81.29 2.79 5.67 0.20 0.03 0.00 0.02 0.16 0.01 0.05 0.02 0.00 0.07 0.03 0.04 0.02 90.28 6134pt51 81.39 2.70 5.41 0.13 0.00 0.04 0.00 0.11 0.04 0.06 0.07 0.00 0.04 0.06 0.02 0.07 89.88 6134pt52 74.27 3.20 4.97 0.22 0.08 0.04 0.02 0.04 0.11 0.23 0.02 0.01 0.10 0.02 0.05 0.04 83.27 98
- Page 67 and 68: the Qtz 1 quartz dissolution result
- Page 69 and 70: Figure 2.9. Microphotograph of typi
- Page 71 and 72: uraninite (Fig. 2.10). The errors o
- Page 73 and 74: Figure 2.10. Backscattered Electron
- Page 75 and 76: post-mineralization alteration duri
- Page 77 and 78: Post-mineralization alteration even
- Page 79 and 80: Volcanic-type ±U 5 (Sample 6139, G
- Page 81 and 82: 6134 pt8a 2 Gunnar 82.92 2.92 5.30
- Page 83 and 84: Regression to zero content of the s
- Page 85 and 86: faults (Fig. 2.13C). The breccias w
- Page 87 and 88: Figure 2.13. Schematic cross-sectio
- Page 89 and 90: Mylonites were then reactivated at
- Page 91 and 92: and thrusting during the 1.94-1.92
- Page 93 and 94: Beaverlodge area (Morelli et al., 2
- Page 95 and 96: dikes (Ernst and Buchan, 2001b) and
- Page 97 and 98: Figure 2.15: Distribution of 207 Pb
- Page 99 and 100: CHAPTER 3 GENESIS OF MULTIFARIOUS U
- Page 101 and 102: eccia-type. The other styles of min
- Page 103 and 104: The basement consist of Neoarchean
- Page 105 and 106: of essentially unmetamorphosed arko
- Page 107 and 108: WDX X-ray spectrometers at Carleton
- Page 109 and 110: 3.4. Results 3.4.1. Paragenesis of
- Page 111 and 112: are derived from their chlorite cry
- Page 113 and 114: Figure 3.4. Photomicrographs of typ
- Page 115: 3.4J). Py 6 Pyrite and Cpy 5 chalco
- Page 119 and 120: 6137APt71 60.67 13.73 4.59 6.48 0.0
- Page 121 and 122: Fig. 3.6A). The Ca may result from
- Page 123 and 124: Sample ID 1 ± 2 ± 3.a ± 4 ± 5.a
- Page 125 and 126: Stable isotopic O and C composition
- Page 127 and 128: Sample ID Deposit Mineral Mineral v
- Page 129 and 130: equilibrium with a fluid having δ
- Page 131 and 132: Syn-ore Chl 8 chlorite sampled from
- Page 133 and 134: Figure 3.9. Binary diagrams showing
- Page 135 and 136: Figure 3.10. Chondrite-normalized R
- Page 137 and 138: Retrograde metamorphism Early vein
- Page 139 and 140: contents in syn-ore Chl 4 chlorite
- Page 141 and 142: decompression and hydration reactio
- Page 143 and 144: mineralizations, which upgraded the
- Page 145 and 146: metamorphic origin of the main U 4
- Page 147 and 148: y the abundance of Ap 1 apatite and
- Page 149 and 150: of late fluid events that have affe
- Page 151 and 152: CHAPTER 4 FLUID EVOLUTION AND GENES
- Page 153 and 154: 1990, 1991; Wyborn et al., 1990). H
- Page 155 and 156: stable isotope geochemistry, U-Pb g
- Page 157 and 158: coincident with the initiation of s
- Page 159 and 160: plasma mass spectrometry (LA-HR-ICP
- Page 161 and 162: The Coronation Hill deposit occupie
- Page 163 and 164: arsenides, nickel selenide and copp
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Chemical Pb Age (Ma)<br />
Figure 3.5. Content of substituting elements in uraninite as function of the chemical Pb age of<br />
different generations of uraninite in U deposits in the Beaverlodge area. Arrow indicates the<br />
effect of alteration by later fluids.<br />
The most altered samples are those of the granite-related metasomatic-type U 3<br />
uraninite from the Gunnar deposit (Fig. 3.5). In U 3 uraninite, the concentration of PbO is<br />
the lowest and the total Ca+Fe+Si the highest, reflecting a higher degree of postmineralization<br />
alteration that has affected U 3 uraninite subsequent to its formation. U 3<br />
uraninite has high P 2 O 5 and Y 2 O 3 contents. In contrast, U 4 uraninite from the breccia-type<br />
mineralization is less altered than U 3 uraninite. The concentration of UO 2 in U 4 uraninite<br />
varies from 73.23 to 78.93 weight percent and PbO contents range from 8.71 to 19.45<br />
weight percent (Table 3.1). The chemical composition of well-preserved breccia-type U 4<br />
uraninite indicates elevated MnO, Y 2 O 3 , SO 3 , and ThO contents (Table 3.1). Other<br />
elements present within the U 4 uraninite structure include CaO, SiO 2 , FeO, and TiO 2<br />
(Table 3.1). The concentration of UO 2 in Br 1<br />
brannerite from the breccia-type<br />
97
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