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$Fayek & Kyser 2000 uraninite fractionations.pdf - Queen's University$

uraninite from the early tensional vein-type has LREE enrichment (La N /Yb N =14.4) but low total REE contents (2386 ppm, Tables 3.7 and 3.8, Fig. 3.10B). The slope of the chondrite-normalized pattern is steep (LREE/HREE=9.7), with slight negative Eu (Eu/Eu*=0.6) and Ce (Ce/Ce*=0.7) anomalies (Fig. 3.10B). The total REE content in the breccia-type U 4 uraninite, the most significant uranium mineralization, is the highest (15848 ppm, Tables 3.7 and 3.8, Figs. 3.9B and 3.10C) with chondrite-normalized REE patterns with a gentle slope (LREE/HREE=4.4), LREE fractionation (La/Yb) N =3.7; Figs. 3.10C and 3.10D), a negative Eu anomaly (Eu/Eu*=0.7), and a poorly defined Ce anomaly (Ce/Ce*=0.9). A B C D 113
Figure 3.9. Binary diagrams showing chondrite normalized REE compositions of different generation of uraninite A. Plot of (Yb) N vs (La/Yb) N , B. Plot of ΣREE vs LREE, C. Plot of (La/Sm) N vs (La/Yb) N , D. Plot of ΣREE vs LREE/HREE. The average total REE concentration in mafic dikes in the Martin Lake Basin is low (ΣREE=378 ppm, Tables 3.7 and 3.8; Figs. 3.9B and 3.9D), with a pronounced LREE enrichment (La N /Yb N =33.6) and slight negative Ce (Ce/Ce*=0.9) and Eu (Eu/Eu*=0.8) anomalies (Fig. 3.10G). The U 5 uraninite from the volcanic-type has low REE contents (ΣREE=4158 ppm) (Tables 3.7 and 3.8; Figs. 3.9B and 3.D) with pronounced LREE enrichment (La N /Yb N =28.2) and negative Ce (Ce/Ce*=0.7) and Eu (Eu/Eu*=0.7) anomalies (Table 3.7, Figs 10E and 10F). Chondrite-normalized REE patterns have a high LREE/HREE ratio of 18, which is similar to patterns in mafic dikes (Fig. 3.10G). Chondrite-normalized (La/Sm) N and (Tb/Yb) N and the ratio LREE/HREE are similar in both mafic dikes and U 5 uraninite (Table 3.7), suggesting a genetic relationship. Mineralisation Type n ΣREE ΣLREE ΣHREE LREE/HREE Eu/Eu* (La/Yb)N (La/Sm)N (Tb/Yb)N (Yb)N Metasomatic 3 17834 2162 1653 7.2 0.1 19.5 5.0 1.6 192.2 Early Tensional vein 5 2386 2162 125 11.1 0.6 14.3 7.4 1.1 16.8 Breccia-type 12 15848 12021 2493 4.5 0.7 4.2 2.0 1.3 372.2 Volcanic-type 14 4158 3897 267 16.6 0.7 25.9 12.6 1.2 23.5 Mafic dyke 10 378 359 19 18.6 0.8 33.6 4.7 2.1 1.7 Athabasca-type 7 9497 8882 479 16.0 0.6 11.4 3.5 1.4 70.2 Table 3.7: Characteristic of REE compositions uraninite for different generations of U mineralization in the Beaverlodge area. (LREE/HREE)=chondrite-normalized (La+Ce+Nd)/(Dy+Er+Yb); Eu*=theoretical value for no chondrite-normalized anomaly. n= number of analyses. 114
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FLUID EVOLUTION AND STRUCTURAL CONT
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Abstract Uranium deposits associate
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Co-Authorship This thesis and the m
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Sarah Rice and Jonathan Cloutier, a
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TABLE OF CONTENTS Abstract………
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2.5.2. Temporal relationships of fa
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4.5.3. Isotopic compositions of min
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List of Figures Figure 1.1. General
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Figure 4.16. Distribution of 207 Pb
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Table 4.4. Isotopic data of the U-P
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processes by which these deposits f
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Figure 1.1. Generalized geological
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which is the equivalent of the Mill
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dolostone and carbonaceous shale (L
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Mineral Field (Figure 1.2). Many de
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2005). U mineralization is controll
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Figure 1.4. Schematic representatio
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In particular, the key issues to be
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genetic model for the U mineralizat
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fourth and most significant uranium
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The Beaverlodge area is part of the
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1998; Hartlaub and Ashton, 1998). R
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(D 1 ) produced a regional migmatit
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These previous age models do not ta
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the age when the concentrations of
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Figure 2.3. A: Detailed geologic ma
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hornblende-feldspar gneiss showing
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east-west striking en-échelon quar
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and broken Kfs 1 and Qtz 1 embedded
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A Meters LEGEND B Figure 2.6. A: De
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Figure 2.7. Microphotograph of vari
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eplaces Kfs 1 feldspars (Fig. 2.7A)
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the Qtz 1 quartz dissolution result
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Figure 2.9. Microphotograph of typi
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uraninite (Fig. 2.10). The errors o
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Figure 2.10. Backscattered Electron
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post-mineralization alteration duri
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Post-mineralization alteration even
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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 and 116: 3.4J). Py 6 Pyrite and Cpy 5 chalco
Page 117 and 118: mineralization varies from 25.70 to
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: Syn-ore Chl 8 chlorite sampled from
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
Page 165 and 166: No corrections were made to the 238
Page 167 and 168: which was interpreted as being asso
Page 169 and 170: porphyry and coated by Chl 1 formin
Page 171 and 172: Mineralized breccias showing quartz
Page 173 and 174: SOUTH ALLIGATOR RIVER GROUP EL SHER
Page 175 and 176: A Carbonaceous Shale B Src 1 Qtz 1
Page 177 and 178: A Granite Qtz 0 fragments Qtz 0 B M
Page 179 and 180: chemical composition as a result of
Page 181 and 182: Sample I.D SiO 2 CaO FeO ThO 2 MnO
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site occupancy (Cathelineau, 1988).
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Mineral values Temperature Fluid va
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Corrected ratios Apparent ages ( ±
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G H Figure 4.12. U-Pb concordia dia
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Figure 4.13. Pb-Pb isochron diagram
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and 4.12B), and to 207 Pb/ 206 Pb a
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160 o C at Coronation Hill. The tem
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Figure 4.15. Conceptual genetic mod
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of the Koolpin Formation, while dep
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at ca. 1820 Ma, approximately 40 My
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culminating with the formation of R
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deposits is related to fluids deriv
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CHAPTER 5 GENERAL DISCUSSION 5.1. I
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ed-bed strata and associated volcan
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character of the fluid that formed
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5.2.1.2. Metamorphic-related uraniu
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during brecciation or reduction as
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ca. 1820 Ma that triggered reactiva
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Plutons Event at 1.4 Ga (Barinek et
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Kolari-Kittila Province Kuusamo Pro
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The uranium deposits in various pro
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Fig. 5.6. Distribution of the Rorai
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Roraima Basin, similar to what is o
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etween ca. 2.3 Ga and 1.9 Ga. Later
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REFERENCES Adams, J., 1989. Postgla
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Ashton, K.E., 2010. The Gunnar Mine
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Bowles, J.F.W., 1990. Age dating of
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Cuney, M.L., 2005. World-class unco
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deposits in the Athabasca Basin, Sa
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Hartlaub, R.P., Heaman, L.M., Chack
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Saskatchewan Geological Survey, Sas
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Kyser, K., and Cuney, M., 2008. Geo
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two-sided oblique-slip collisional
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Creek Geosyncline: in ‘The minera
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Piper, J.D.A., 2004. Discussion on
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99.Sheppard SMF and Gilg HA 1996. S
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Proceedings Darwin Conference 1984
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Wingate, M.T.D, Pisarevsky SA, Evan
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Sample Deposit 207 Pb/ 206 Pb ±2σ
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APPENDIX B REE contents of various
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Sample Y Zr Cs Ba Th La Ce Pr Nd Sm
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Sample ΣREE TLREE THREE LREE/HREE
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SAMPLE ID. SiO 2 TiO 2 AL 2O 3 CR 2
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SAMPLE ID. SiO 2 TiO 2 AL 2O 3 CR 2
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APPENDIX E Electron microprobe data
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SAMPLE Si 4+ AL 4+ Total AL 6+ Ti 4
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SAMPLE Si 4+ AL 4+ Total AL 6+ Ti 4
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Sample ID. Deposit UO 2 SiO 2 CaO F
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Sample ID. Deposit UO 2 SiO 2 CaO F
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Sample ID. Al 2O 3 CaO FeO K2O MgO
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Sample ID. Al 2O 3 CaO FeO K2O MgO
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250 85 330 40 145 70 25 65 30 30 27
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Mineralized veins Quartz veins 276
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