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

(Sample 6137, Gunnar). F: Pitted, mottled and heterogeneous U 4 from breccia-type (Sample B5812, Fay). Uraninite -type Deposit a. Primary uranium mineralization. Upper intercept age (Ma) Lower intercept age (Ma) 207 Pb/ 206 Pb age (Ma) MSWD Figure Cataclasite-type U 1 Fay 2306±360 907±330 2293±17 0.13 11A Early vein-type U 2 Fay 1594±95 89±670 2289±20 0.089 11B Breccia-type U 4 Ace-Fay 1857±170 42±350 1848±5 0.5 11C Volcanic-type U 5 Ace-Fay 1783±7 71±79 1812±15 6.2 11D Volcanic-type U 5 Gunnar 1774±25 109±110 1800±37 1.14 11E Athabasca-type U 6 Martin Lake 1601±64 441±92 1620±4 10 11F b. Post-mineralization alteration events recorded in altered uraninite Metasomatic-type U 3 Gunnar 1549±78 75±13 1210±25 1.02 11G Breccia-type U 4 Fay 1355±40 54±87 1330±10 0.59 11H Metasomatic-type U 3 Gunnar 1219±230 13±53 352±31 3.5 11I Breccia-type U 4 Cinch Lake 1094±66 28±31 1019±44 0.57 11J Metasomatic-type U 3 Gunnar 818±47 47±61 786±19 0.13 11K Athabasca-type U 6 Eagle 635±170 166±30 347±14 0.42 11L Volcanic-type U 5 Eagle-Ace 439±56 103±29 325±28 1.4 11M Metasomatic-type U 3 Gunnar 391±40 31±150 352±61 0.18 11N Table 2.2. Summary of the U-Pb concordia results of U-rich minerals for various events of: a) primary uranium mineralization and b) post-mineralization alteration and resetting events in the Beaverlodge area. Figure refers to figure in text that shows the mode of occurrence of the uraninite. 2.4.4.1.1. Geochronology of the cataclasite-type ±U 1 U 1 uraninite has U-Pb isotopic compositions that define a discordia line and groups of 207 Pb/ 206 Pb ages (Fig. 2.11A, Table 2.1). The discordia line has an upper intercept age of 2306±360 Ma and a lower intercept of 907±330 Ma (2σ, MSWD: 0.13). The oldest 207 Pb/ 206 Pb age is 2293±17 Ma, which overlaps the upper intercept age and is interpreted as the minimum formation age. The 207 Pb/ 206 Pb system displays five groups of age that reflect 55
post-mineralization alteration during the intervals of 2.2-2.1 Ga, 2.1-2.0 Ga, 2.0-1.9 Ga, 1.9-1.8 Ga, and 1.6 Ga (Table 2.1 and Appendix 1). 2.4.4.1.2. Geochronology of the early tensional vein-type ±U 2 U 2 uraninite gives a discordant U-Pb upper-intercept age of 1594±95 Ma and a lower intercept of 89±670 Ma (Fig. 2.11B). The oldest 207 Pb/ 206 Pb age of 2289±20 Ma is interpreted as a minimum crystallization age. The 207 Pb/ 206 Pb system shows alteration events at ca. 2.2-2.1 Ga, 2.1-2.0 Ga, 2.0-1.9 Ga, 1.9-1.8 Ga, and 1.6 Ga (Table 2.1, Fig. 2.11, and Appendix 1). 2.4.4.1.3. Geochronology of the granite-related metasomatic-type U 3 in Gunnar U/Pb isotopic ratios of U 3 are discordant with very low Pb/U ratios that indicate significant Pb loss. Ages obtained in the U/Pb system range between 1550 to 10 Ma (Tables 2.1b and 2.2b) and do not reflect the formation age of the granite-related metasomatic-type U mineralization because of substantial Pb loss. Rather they reflect periods of alteration that have significantly affected U 3 subsequent to its formation. 2.4.4.1.4. Geochronology of the breccia-type U 4 U/Pb isotopic ratios of U 4 , which reflect the major uranium mineralizing event, are discordant and yield a U-Pb upper-intercept age of 1857±170 Ma (2σ, MSWD: 0.5) and a lower intercept of 42±350 (Fig. 2.11C). The oldest 207 Pb/ 206 Pb age of 1848±5 Ma records the minimum crystallization age. Post-mineralization alteration recorded in the 207 Pb/ 206 Pb ratios occur at ca. 1.8 Ga, 1.4-1.3 Ga, 1.2-0.9 Ga, 0.8 Ga and 0.5 Ga (Table 2.1). 2.4.4.1.5. Geochronology of the volcanic-type ±U 5 56
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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
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
Page 53 and 54: hornblende-feldspar gneiss showing
Page 55 and 56: east-west striking en-échelon quar
Page 57 and 58: and broken Kfs 1 and Qtz 1 embedded
Page 59 and 60: A Meters LEGEND B Figure 2.6. A: De
Page 62 and 63: Figure 2.7. Microphotograph of vari
Page 64: eplaces Kfs 1 feldspars (Fig. 2.7A)
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: Figure 2.10. Backscattered Electron
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 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
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Stable isotopic O and C composition
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Sample ID Deposit Mineral Mineral v
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equilibrium with a fluid having δ
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Syn-ore Chl 8 chlorite sampled from
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Figure 3.9. Binary diagrams showing
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Figure 3.10. Chondrite-normalized R
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Retrograde metamorphism Early vein
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contents in syn-ore Chl 4 chlorite
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decompression and hydration reactio
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mineralizations, which upgraded the
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metamorphic origin of the main U 4
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y the abundance of Ap 1 apatite and
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of late fluid events that have affe
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CHAPTER 4 FLUID EVOLUTION AND GENES
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1990, 1991; Wyborn et al., 1990). H
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stable isotope geochemistry, U-Pb g
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coincident with the initiation of s
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plasma mass spectrometry (LA-HR-ICP
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The Coronation Hill deposit occupie
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arsenides, nickel selenide and copp
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No corrections were made to the 238
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which was interpreted as being asso
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porphyry and coated by Chl 1 formin
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Mineralized breccias showing quartz
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SOUTH ALLIGATOR RIVER GROUP EL SHER
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A Carbonaceous Shale B Src 1 Qtz 1
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A Granite Qtz 0 fragments Qtz 0 B M
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chemical composition as a result of
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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
Page 241 and 242:
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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