Proposed Title 1: - Queen's University
Proposed Title 1: - Queen's University Proposed Title 1: - Queen's University
Surface 100m Figure 4.3. Geological cross-section of El Sherana and El Sherana West U deposits showing main lithological units and location of the U mineralization. (modified from Valenta, 1991) The mineralized zone has a strike length of 400 m and a vertical range of 180 m (Taylor, 1968). The total production was 226 t U 3 O 8 and 0.33 t Au from El Sherana, and 185 t U 3 O 8 and 0.007 t Au from El Sherana West during the period 1956-1964. Primary U mineralization occurs as pods, lenticular masses, veins and disseminations and is associated with fault zones and brittle fracturing (Taylor, 1968; Ayres and Eadington, 1975; Valenta, 1989, 1991). Gold occurs as veinlets within the uranium ore or as separate zones of mineralization. Minor galena, angelsite, clausthalite, pyrite, marcasite, cobalt-nickel 143
arsenides, nickel selenide and copper sulfides are also associated with the ore (Threadgold, 1960). 4.4. Methodology Polished thin sections were prepared from 250 core samples from the El Sherana and Coronation Hill deposits (Fig. 4.1) and were examined using transmitted and reflected-light microscopy to determine mineral crosscutting relationships and develop a paragenetic succession for the area. Electron microprobe analysis of syn-ore chlorite and uraninite were done on polished thin sections using a JEOL JXA-8230 equipped with five wavelength dispersive spectrometers (WDS) at Queen’s University, Canada. A suite of well-characterized natural and synthetic minerals and compounds were used as calibration standards. Analytical conditions were 15 kV accelerating voltage, 10 nA beam current, and a defocused beam. Typical counting times were 10 s for major elements and 20 s for minor elements. Analytical errors were
- 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 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: The Coronation Hill deposit occupie
- 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
- Page 183 and 184: site occupancy (Cathelineau, 1988).
- Page 185 and 186: Mineral values Temperature Fluid va
- Page 187 and 188: Corrected ratios Apparent ages ( ±
- Page 189 and 190: G H Figure 4.12. U-Pb concordia dia
- Page 191 and 192: Figure 4.13. Pb-Pb isochron diagram
- Page 193 and 194: and 4.12B), and to 207 Pb/ 206 Pb a
- Page 195 and 196: 160 o C at Coronation Hill. The tem
- Page 197 and 198: Figure 4.15. Conceptual genetic mod
- Page 199 and 200: of the Koolpin Formation, while dep
- Page 201 and 202: at ca. 1820 Ma, approximately 40 My
- Page 203 and 204: culminating with the formation of R
- Page 205 and 206: deposits is related to fluids deriv
- Page 207 and 208: CHAPTER 5 GENERAL DISCUSSION 5.1. I
- Page 209 and 210: ed-bed strata and associated volcan
- Page 211 and 212: character of the fluid that formed
arsenides, nickel selenide and copper sulfides are also associated with the ore (Threadgold,<br />
1960).<br />
4.4. Methodology<br />
Polished thin sections were prepared from 250 core samples from the El Sherana and<br />
Coronation Hill deposits (Fig. 4.1) and were examined using transmitted and reflected-light<br />
microscopy to determine mineral crosscutting relationships and develop a paragenetic<br />
succession for the area.<br />
Electron microprobe analysis of syn-ore chlorite and uraninite were done on polished<br />
thin sections using a JEOL JXA-8230 equipped with five wavelength dispersive<br />
spectrometers (WDS) at Queen’s <strong>University</strong>, Canada. A suite of well-characterized natural<br />
and synthetic minerals and compounds were used as calibration standards. Analytical<br />
conditions were 15 kV accelerating voltage, 10 nA beam current, and a defocused beam.<br />
Typical counting times were 10 s for major elements and 20 s for minor elements.<br />
Analytical errors were
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