Proposed Title 1: - Queen's University
Proposed Title 1: - Queen's University Proposed Title 1: - Queen's University
from both the Trans-Amazon and Tapajo´s-Parima orogenic belts to the east and northeast (Santos al., 2003). The minimum age of the Roraima Basin was determined by U-Pb geochronology from mafic sills to be 1782±3 Ma (Santos et al., 2003). A number of U showings are spatially associated with the Roraima Basin. These include the Aricheng albitite-hosted U mineralization (Fig. 5.7) and several other occurrences hosted by the Kurupung Batholith in the basement near the Roraima Basin, in western Guyana (Cinelu and Cuney 2006; Alexandre, 2010). The Aricheng deposit is geologically similar to albitite-hosted deposits worldwide (Cinelu and Cuney 2006, Alexandre, 2010). The Lagoa Real and Espinharas U deposits in Brazil have host rocks that resemble those of around Kurupung Batholith in the Aricheng deposit. Syn-ore hydrothermal zircon gives a minimum age of 1995±15 Ma for the U mineralization (Alexandre, 2010), which is older than the age of the Roraima Basin. The timing and style of U mineralization in the Aricheng deposit (Cinelu and Cuney 2006, Alexandre, 2010) in Guyana and Lagoa Real (Lobato and Fyfe, 1990) and Espinharas deposits (Porto de Silveira et al. 1991) in Brazil are similar to those of the granite-related U mineralization in the Beaverlodge area (Dieng et al., 2011). This early U mineralization associated with the underlying basement rock in the Roraima Basin could have been a potential source for detrital uraninite in the younger Paleoproterozoic Roraima Basin as most of the detritus in the basin were derived from Trans-Amazonian granitoids (Orestes al., 2003) that host most of the U deposits in the successor basins. The presence of early U mineralization in successor basins is thus a favorable indication for unconformity-related U mineralization in the younger Paleoproterozoic 207
Roraima Basin, similar to what is observed in the Beaverlodge area in Canada, the South Alligator River area in Australia, and the Koli province in eastern Finland Fig. 5.7. Geological map of the Aricheng occurrence with the major geotectonic units in South America (top) and with the major rock types observed in its vicinity in western Guyana (bottom) (modified from Alexander et al., 2010). 208
- 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
- Page 213 and 214: 5.2.1.2. Metamorphic-related uraniu
- Page 215 and 216: during brecciation or reduction as
- Page 217 and 218: ca. 1820 Ma that triggered reactiva
- Page 219 and 220: Plutons Event at 1.4 Ga (Barinek et
- Page 221 and 222: Kolari-Kittila Province Kuusamo Pro
- Page 223 and 224: The uranium deposits in various pro
- Page 225: Fig. 5.6. Distribution of the Rorai
- Page 229 and 230: etween ca. 2.3 Ga and 1.9 Ga. Later
- Page 231 and 232: REFERENCES Adams, J., 1989. Postgla
- Page 233 and 234: Ashton, K.E., 2010. The Gunnar Mine
- Page 235 and 236: Bowles, J.F.W., 1990. Age dating of
- Page 237 and 238: Cuney, M.L., 2005. World-class unco
- Page 239 and 240: deposits in the Athabasca Basin, Sa
- Page 241 and 242: Hartlaub, R.P., Heaman, L.M., Chack
- Page 243 and 244: Saskatchewan Geological Survey, Sas
- Page 245 and 246: Kyser, K., and Cuney, M., 2008. Geo
- Page 247 and 248: two-sided oblique-slip collisional
- Page 249 and 250: Creek Geosyncline: in ‘The minera
- Page 251 and 252: Piper, J.D.A., 2004. Discussion on
- Page 253 and 254: 99.Sheppard SMF and Gilg HA 1996. S
- Page 255 and 256: Proceedings Darwin Conference 1984
- Page 257 and 258: Wingate, M.T.D, Pisarevsky SA, Evan
- Page 259 and 260: Sample Deposit 207 Pb/ 206 Pb ±2σ
- Page 261 and 262: Sample Deposit 207 Pb/ 206 Pb ±2σ
- Page 263 and 264: Sample Deposit 207 Pb/ 206 Pb ±2σ
- Page 265 and 266: APPENDIX B REE contents of various
- Page 267 and 268: Sample Y Zr Cs Ba Th La Ce Pr Nd Sm
- Page 269 and 270: Sample ΣREE TLREE THREE LREE/HREE
- Page 271 and 272: SAMPLE ID. SiO 2 TiO 2 AL 2O 3 CR 2
- Page 273 and 274: SAMPLE ID. SiO 2 TiO 2 AL 2O 3 CR 2
- Page 275 and 276: APPENDIX E Electron microprobe data
Roraima Basin, similar to what is observed in the Beaverlodge area in Canada, the South<br />
Alligator River area in Australia, and the Koli province in eastern Finland<br />
Fig. 5.7. Geological map of the Aricheng occurrence with the major geotectonic units in South<br />
America (top) and with the major rock types observed in its vicinity in western Guyana<br />
(bottom) (modified from Alexander et al., 2010).<br />
208
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