Proposed Title 1: - Queen's University
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2006) that likely formed during rifting and breakup between 2.5 Ga and 2.0 Ga that strongly affected and partly dispersed the Archean domains (Gorbatschev and Bogdanova, 1993). Sedimentary rocks of the Jatulian lower sequence (Fig. 5.5) constitute a successor basin to this major tectonic event and are later inverted during the 1.95-1.82 Ga Svecofennian Orogen (Pharaoh and Brewer, 1990), exhumed and overlain by the late Mesoproterozoic Satakunta Basin at ca.1.4–1.3 Ga (Simonen, 1980). Figure 5.5. Schematic Karelian stratigraphy, lithology, and uranium occurrences in the Koli area, eastern Finland, showing location of various U deposits (modified from Piiarinen (1968), Merlainen (1980) and Äikä (2006)) In the Koli domain, six U deposits are known within the lower quartzite and middle arkosite member of the Jatulian unit (Fig 5.5, Äikä, 2006). 203
The uranium deposits in various provinces shown in Fig. 5.4 have been interpreted as epigenetic in origin with fluid probably originated from the Archean granitoids and associated Paleoproterozoic rocks (Äikä and Sarikkola, 1987). The U mineralization occurs as: (1) lenses and disseminations in the quartz-pebble conglomerate in quartzite and arkosite members, (2) near the contact between the Jatulian diabase dikes and the basal conglomerate where they cut the uraniferous quartzite-conglomerate horizon, and (3) at the unconformity between the Sariolian basement rocks and the basal conglomerate of the lower Jatulian unit (Fig.5.5). Recent geochronological studies suggest that the age of the Jatulian U mineralization is close to ca. 2273 Ma (K. Kyser, pers. Comm.2012) with extensive late alteration related to subsequent tectonic events such as the dominant 1.95-1.82 Ga Svecofennian Orogen (Pharaoh and Brewer, 1990). The age of the U mineralization in this successor basin is therefore older than the overlying late Mesoproterozoic Satakunta sandstones deposited at 1.4-1.3 Ma (Fig. 5.4). Aikas and Sarikkola (1987) suggested that mineralogical and geochemical evidence indicate multistage epigenetic U mineralization in these deposits. Äikä and Sarikkola (1987) and Saltikoff et al (2006) suggested some similarities with known economically important, unconformity, vein, breccia, and sandstone deposit styles. The styles of U mineralization spatially associated with Jatulian successor basins in the Koli area, the occurrence of U at the basal Jatulian unconformity, the close association between the U mineralization and the 2.1–1.97 Ma mafic dikes, and U occurrences as disseminations in metamorphosed conglomerate of the Jatulian quartzite and arkosite members (Fig. 5.5), suggest many similarities between these deposits and U deposits 204
- 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
- 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: Kolari-Kittila Province Kuusamo Pro
- Page 225 and 226: Fig. 5.6. Distribution of the Rorai
- Page 227 and 228: Roraima Basin, similar to what is o
- 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
2006) that likely formed during rifting and breakup between 2.5 Ga and 2.0 Ga that<br />
strongly affected and partly dispersed the Archean domains (Gorbatschev and Bogdanova,<br />
1993). Sedimentary rocks of the Jatulian lower sequence (Fig. 5.5) constitute a successor<br />
basin to this major tectonic event and are later inverted during the 1.95-1.82 Ga<br />
Svecofennian Orogen (Pharaoh and Brewer, 1990), exhumed and overlain by the late<br />
Mesoproterozoic Satakunta Basin at ca.1.4–1.3 Ga (Simonen, 1980).<br />
Figure 5.5. Schematic Karelian stratigraphy, lithology, and uranium occurrences in the Koli<br />
area, eastern Finland, showing location of various U deposits (modified from Piiarinen (1968),<br />
Merlainen (1980) and Äikä (2006))<br />
In the Koli domain, six U deposits are known within the lower quartzite and middle<br />
arkosite member of the Jatulian unit (Fig 5.5, Äikä, 2006).<br />
203
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