Abstract
Proterozoic basement-hosted unconformity-related uranium deposits of the Athabasca Basin (Saskatchewan, Canada) were affected by significant uranium redistribution along oxidation–reduction redox fronts related to cold and late meteoric fluid infiltration. These redox fronts exhibit the same mineralogical and geochemical features as the well-studied uranium roll-front deposits in siliclastic rocks. The primary hydrothermal uranium mineralisation (1.6–1.3 Ga) of basement-hosted deposits is strongly reworked to new disseminated ores comprising three distinctly coloured zones: a white-green zone corresponding to the previous clay-rich alteration halo contemporaneous with hydrothermal ores, a uranium front corresponding to the uranium deposition zone of the redox front (brownish zone, rich in goethite) and a hematite-rich red zone marking the front progression. The three zones directly reflect the mineralogical zonation related to uranium oxides (pitchblende), sulphides, iron minerals (hematite and goethite) and alumino-phosphate-sulphate (APS) minerals. The zoning can be explained by processes of dissolution–precipitation along a redox interface and was produced by the infiltration of cold (<50°C) meteoric fluids to the hydrothermally altered areas. U, Fe, Ca, Pb, S, REE, V, Y, W, Mo and Se were the main mobile elements in this process, and their distribution within the three zones was, for most of them, directly dependent on their redox potential. The elements concentrated in the redox fronts were sourced by the alteration of previously crystallised hydrothermal minerals, such as uranium oxides and light rare earth element (LREE)-rich APS. The uranium oxides from the redox front are characterised by LREE-enriched patterns, which differ from those of unconformity-related ores and clearly demonstrate their distinct conditions of formation. Uranium redox front formation is thought to be linked to fluid circulation episodes initiated during the 400–300 Ma period during uplift and erosion of the Athabasca Basin when it was near the Equator and to have been still active during the last million years. A major kaolinisation event was caused by changes in the fluid circulation regime, reworking the primary uranium redox fronts and causing the redistribution of elements originally concentrated in the uranium-enriched meteoric-related redox fronts.
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References
Adler HH (1974) Concepts of uranium-ore formation in reducing environments in sandstones and other sediments. Formation of uranium ore deposits. IAEA Conference, Athens, Greece, pp 141–167
Alexandre P, Kyser K, Thomas D, Polito P, Marlat J (2009) Geochronology of unconformity-related uranium deposits in the Athabasca Basin, Saskatchewan, Canada and their integration in the evolution of the basin. Miner Deposita 44:41–59
Annesley IR, Madore C, Portella P (2001) Paleoproterozoic structural, metamorphic, and magmatic evolution of the eastern sub-Athabasca basement: controls on unconformity-type uranium deposits (ext. abs.). A hydrothermal odyssey, Townsville, Queensland, Extended Conference Abstract, pp 3–4
Annesley IR, Madore C, Portella P (2005) Geology and thermotectonic evolution of the western margin of the Trans-Hudson Orogen: evidence from the eastern sub-Athabasca basement, Saskatchewan. Can J Earth Sci 42:573–597
Armstrong RL, Ramaekers P (1985) Sr isotopic study of Helikian sediment and diabase dikes in the Athabasca Basin, northern Saskatchewan. Can J Earth Sci 22:399–407
Bonhoure J, Kister P, Cuney M, Deloule E (2007) Methodology for rare earth element determinations of uranium oxides by ion microprobe. Geostand Geoanal Res 31:209–225
Bowles JFW (1990) Age dating of individual grains of uraninite in rocks from electron microprobe analyses. Chem Geol 83:47–53
Bozkurt E, Pereira MF, Strachan R, Quesada C (2008) Evolution of the Rheic Ocean. Tectonophysics 461:1–8
Cai C, Li H, Qin M, Luo X, Wang F, Ou G (2007) Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China. Ore Geol Rev 32:262–274
Carignan J, Hild P, Mevelle G, Morel J, Yeghicheyan D (2001) Routine analyses of trace elements in geological samples using flow injection and low pressure on-line liquid chromatography coupled to ICP-MS: a study of geochemical reference materials BR, DR-N, UB-N, AN-G and GH. Geostand Geoanal Res 25:187–198
Carl C, Von Pechmann E, Höhndorf A, Ruhrmann G (1992) Mineralogy and U/Pb, Pb/Pb, and Sm/Nd geochronology of the Key Lake uranium deposit, Athabasca Basin, Saskatchewan, Canada. Can J Earth Sci 29:879–895
Cathelineau M (1982) Les mécanismes de type “roll-front” dans les granites: un modèle de remobilisation dans les gisements hydrothermaux d’uranium. CR Acad Sci Paris 294:865–968
Cathelineau M, Boiron MC, Holliger P, Poty B (1990) Metallogenesis of the French part of the Variscan orogen. Part II: time–space relationships between U, Au and SnW ore deposition and geodynamic events—mineralogical and U/Pb data. Tectonophysics 177:59–79
Chiarenzelli J, Aspler L, Villeneuve M, Lewry J (1998) Early proterozoic evolution of the Saskatchewan craton and its allochthonous cover, Trans-Hudson Orogen. J Geol 106:247–267
Cloutier J, Kyser K, Olivo GR, Alexandre P, Halaburda J (2009) The Millennium uranium deposit, Athabasca Basin, Saskatchewan, Canada: an atypical basement-hosted unconformity-related uranium deposit. Econ Geol 104:815–840
Cumming GL, Krstic D (1992) The age of unconformity-related uranium mineralization in the Athabasca Basin, northern Saskatchewan. Can J Earth Sci 29:1623–1639
Cuney M, Chabiron A, Kister P, Golubev V, Deloule E (2002) Chemical versus ion microprobe isotopic dating (CAMECA IMS 3f) of the Shea Creek unconformity-type uranium deposit (West Athabasca, Saskatchewan, Canada). GAC-MAC Congress, Québec, Canada, p 25
Curiale JA, Bloch S, Rafalska-Bloch J, Harrison WE (1983) Petroleum-related origin for uraniferous organic-rich nodules of southwestern Oklahoma. AAPG Bull 67:588–608
Deloule E, Allègre C, Doe B (1986) Lead and surfur isotope microstratigraphy in galena crystal from Mississipi Valley-type deposits. Econ Geol 81:1307–1321
Derome D, Cathelineau M, Cuney M, Fabre C, Lhomme T, Banks DA (2005) Mixing of sodic and calcic brines and uranium deposition at McArthur River, Saskatchewan, Canada: a Raman and laser-induced breakdown spectroscopic study of fluid inclusions. Econ Geol 100:1529–1545
Dubessy J, Charpentier D, Cathelineau M, Ruck-Mosser R, Roubeuf V (1999) Evaluation potentielle de l’évolution des argiles de Bo. Rapport CREGU no. B RP OCRE 99-005, p 106
Fayek M, Kyser TK (1997) Characterization of multiple fluid-flow events and rare-earth-element mobility associated with formation of unconformity-type uranium deposits in the Athabasca Basin, Saskatchewan. Can Mineralog 35:627–658
Fayek M, Harrison TM, Grove M, Coath CD (2000) A rapid in situ method for determining the ages of uranium oxide minerals: Evolution of the Cigar Lake deposit, Athabasca basin. Intl Geol Rev 42:163–171
Fayek M, Harrison TM, Ewing RC, Grove M, Coath CD (2002a) O and Pb isotopic analyses of uranium minerals by ion microprobe and U–Pb ages from the Cigar Lake deposit. Chem Geol 185:205–225
Fayek M, Kyser TK, Riciputi LR (2002b) U and Pb isotope analysis of uranium minerals by ion microprobe and the geochronology of McArthur River and Sue zone uranium deposits, Saskatchewan, Canada. Can Mineralog 40:1553–1569
Fischer RP (1950) Uranium bearing sandstone deposits of the Colorado Plateau. Econ Geol 45:1–11
Fritz B (1975) Etude thermodynamique et simulation des réactions entre minéraux et solutions. Application à la géochimie des altérations et des eaux continentales: Mem. Sciences Geol 41, Université Louis Pasteur, Strasbourg, p 152
Fryer BJ, Taylor RP (1987) Rare earth elements distributions in uraninites: implications for ore genesis. Chem Geol 63:101–108
Gaboreau S, Beaufort D, Vieillard P, Patrier P, Bruneton P (2005) Aluminum phosphate–sulfate minerals associated with Proterozoic unconformity-type uranium deposits in the East Alligator River Uranium Field, Northern Territories, Australia. Can Mineralog 43:813–827
Gaboreau S, Cuney M, Quirt D, Beaufort D, Patrier P, Mathieu R (2007) Significance of aluminum phosphate–sulfate minerals associated with U unconformity-type deposits: The Athabasca basin, Canada. Am Mineralog 92:267–280
Goldhaber MB, Reynolds RL, Rye RO (1978) Origin of a South Texas roll-type uranium deposit—2. Sulfide petrology and sulfur isotope studies. Econ Geol 73:1690–1705
Granger HC, Warren CG (1969) Unstable sulfur compounds and the origin of roll-type deposits. Econ Geol 64:160
Halter G, Sheppard SMF, Weber F, Clauer N, Pagel M (1987) Radiation-related retrograde hydrogen isotope and K–Ar exchange in clays minerals. Nature 330:638–641
Harshman EN (1974) Distribution of elements in some roll-type uranium deposits. Formation of uranium ore deposits. IAEA Conference, Athens, Greece, pp 169–183
Hoeve J, Quirt D (1984) Mineralization and host rock alteration in relation to clay mineral diagenesis and evolution of the middle Proterozoic Athabasca Basin, northern Saskatchewan, Canada. Saskatchewan Research Council Technical Report, p 187
Höhndorf A, Lenz H, Von Pechmann E (1985) Radiometric age determination on samples of Key Lake uranium deposits. In: Sibbald TII, Petruk W (eds) Geology of uranium deposits. Special Volume 32. Canadian Institute of Mining and Metallurgy, pp 48–53
Holliger P (1988) Ages U–Pb définis in situ sur oxydes d'uranium à l'analyseur ionique: méthodologie et conséquences géochimiques. CR Acad Sci Paris 307:367–373
Jaireth S, McKay A, Lambert I (2008) Sandstone uranium deposits associated with hydrocarbon-bearing basins: implications for uranium exploration in Australia. Australian Institute and Metallurgy’s International Conference, Adelaide, Australia
Jefferson CW, Thomas D, Gandhi SS, Ramaekers P, Delauney G, Brisbin D, Cutts C, Portella P, Olson RA (2007) Unconformity-associated uranium deposits of the Athabasca Basin, Saskatchewan and Alberta. In: Jefferson CW, Delaney G (eds) EXTECH IV: Geology and Uranium EXploration TECHnology of the Proterozoic Athabasca Basin, Saskatchewan and Alberta. Geological Survey of Canada Bulletin 588, pp 23–67
Keppie JD (2004) Terranes of Mexico revisited: a 1.3 billion year odyssey. Int Geol Rev 46:765–794
Kish L, Cuney M (1981) Uraninite–albite veins from Mistamisk Valley of the Labrador Trough, Quebec. Mineralog Mag 44:471–483
Kister P (2003) Mobilité des éléments géochimiques dans un bassin sédimentaire clastique, du Protérozoïque à nos jours: le bassin Athabasca (Saskatchewan, Canada). Unpublished PhD thesis, INPL, p 333
Kister P, Cuney M, Golubev VN, Royer J-J, De Veslud CLC, Rippert J-C (2004) Radiogenic lead mobility in the Shea Creek unconformity-related uranium deposit (Saskatchewan, Canada): migration pathways and Pb loss quantification. CR Geosci 336:205–215
Komninou A, Sverjensky DA (1996) Geochemical modeling on the formation of an unconformity-type uranium deposit. Econ Geol 91:590–606
Kotzer TG, Kyser TK (1993) O, U, and Pb isotopic and chemical variations in uraninite: implications for determining the temporal and fluid history of ancient terrains. Am Mineralog 78:1262–1274
Kotzer TG, Kyser TK (1995) Petrogenesis of the Proterozoic Athabasca Basin, northern Saskatchewan, Canada, and its relation to diagenesis, hydrothermal uranium mineralization and paleohydrogeology. Chem Geol 120:45–89
Kotzer TG, Kyser TK, Irving E (1992) Paleomagnetism and the evolution of fluids in the Proterozoic Athabasca Basin, northern Saskatchewan, Canada. Can J Earth Sci 29:1474–1491
Kyser K, Hiatt E, Renac C, Durocher K, Holk G, Deckart K (2000) Diagenetic fluids in paleo- and meso-Proterozoic sedimentary basins and their implications for long protracted fluid histories. In: Kyser T (ed) Fluids and basin evolution, 28. Mineralogical Association of Canada Short Course, pp 225–262
LeCheminant AN, Heaman LM (1989) Mackenzie igneous events, Canada: Middle Proterozoic hotspot magmatism associated with ocean opening. Earth Planet Sci Lett 96:38–48
Ludwig KR (1999) Isoplot/ex version 2.1.0. A geochronological toolkit for Microsoft Excel. Special Publication no. 1a, Berkeley Geochronological Center
Luo YR, Byrne RH (2001) Yttrium and rare earth element complexation by chloride ions at 25°C. J Solution Chem 30:837–845
Madore C, Annesley IR, Tran HT (1999) Petrology and geochemistry of Paleoproterozoic Wollaston Group metasediments from the eastern Keller Lake–Siemens Lake area, Saskatchewan: a preliminary interpretation. Saskatchewan Geological Survey. Summary of investigations, v. 2, pp 80–89
Mercadier J (2008) Conditions de genèse des gisements d'uranium associés aux discordances portérozoïques et localisés dans les socles. Exemple du socle du bassin d'Athabasca (Saskatchewan, Canada). Unpublished PhD thesis, INPL, p 325
Mercadier J, Cuney M, Quirt D (2009) Basement-hosted uranium oxides from Athabasca Basin: mineralogy, U/Pb dating, major and rare earth elements (REE) concentrations: comparison with U-oxides from deposits located in the vicinity of the unconformity. 24th IAGS, Fredericton, Canada, pp 437–440
Mercadier J, Richard A, Boiron M-C, Cathelineau M, Cuney M (2010) Migration of brines in the basement rocks of the Athabasca Basin through microfracture networks (P-Patch U deposit, Canada). Lithos 115:121–136
Min M, Xu H, Chen J, Fayek M (2005) Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China. Ore Geol Rev 26:198–206
Min M, Peng X, Zhou X, Qiao H, Wang J, Zhang L (2007) Hydrochemistry and isotope compositions of groundwater from the Shihongtan sandstone-hosted uranium deposit, Xinjiang, NW China. J Geochem Explor 93:91–108
Mwenifumbo CJ, Bernius GR (2007) Crandallite-group minerals: host of thorium enrichment in the eastern Athabasca basin, Saskatchewan. In: Jefferson CW, Delaney G (eds) EXTECH IV: Geology and Uranium EXploration TECHnology of the Proterozoic Athabasca Basin, Saskatchewan and Alberta. Geological Survey of Canada Bulletin 588, pp 521–638
Pagel M (1975) Détermination des conditions physico-chimiques de la silicification diagénétique des grès Athabasca (Canada) au moyen des inclusions fluides. CR Acad Sci Paris 280:2301–2304
Pagel M, Pinte G, Rotach-Toulhoat N (1987) The rare earth elements in natural uranium oxides. Monogr Ser Miner Depos 27:81–85
Philippe S, Lancelot JR, Clauer N, Pacquet A (1993) Formation and evolution of the Cigar Lake uranium deposit based on U–Pb and K–Ar isotope systematics. Can J Earth Sci 30:720–730
Piani L, Sangély L, Mercadier J, Cuney M (2008) A new method for rare earth elements analysis by secondary ion mass spectrometry. SIMS Europe 2008 Conference, Münster, Germany
Quirt D (1989) Host-rock alteration at Eagle Point South. Saskatchewan Research Council. SRC Publication No. R-855-1-E-89, p 72
Quirt D, Kotzer TG, Kyser K (1991) Tourmaline, phosphate minerals, zircon and pitchblende in the Athabasca Group: MAW zone and McArthur River areas. Summary of Investigations 1991. Saskatchewan Geological Survey, Saskatchewan Miner. Res., Rep. 91-4, pp 181–191
Ramaekers P (1990) Geology of the Athabasca Group (Helikian) in northern Saskatchewan. Saskatchewan Geological Survey, Saskatchewan Miner. Res., Technical Report 1950, p 49
Ramaekers P, Jefferson CW, Yeo G, Collier B, Long DGF, Catueanu O, Bernier S, Kupsch B, Post R, Drever G, McHardy S, Jiricka D, Cutts C, Wheatley K (2007) Revised geological map and stratigraphy of the Athabasca Group, Saskatchewan and Alberta. In: Jefferson CW, Delauney G (eds) EXTECH IV: Geology and Uranium EXploration TECHnology of the Proterozoic Athabasca Basin, Saskatchewan and Alberta. Geological Survey of Canada Bulletin 588, pp 155–191
Ramanaidou E, Nahon D, Decarreau A, Melfi AJ (1996) Hematite and goethite from duricrusts developed by lateritic chemical weathering of Precambrian banded iron formation, Minas Gerais, Brazil. Clays Clay Miner 44:22–31
Renaud A (2006) Unconformity and basement-hosted uranium deposits at the Rabbit Lake Operation, Collins Bay, Saskatchewan. 2006 CIM Field Conference: Athabasca Deposits & Analogues, Saskatoon, Canada, CIM
Respaut JP, Cathelineau M, Lancelot JR (1991) Multistage evolution of the Pierres-Plantées uranium ore deposit (Margeride, France): evidence from mineralogy and U–Pb systematics. Eur J Mineralog 3:85–103
Reynolds RL, Goldhaber MB, Carpenter DJ (1982) Biogenic and nonbiogenic ore-forming processes in the south Texas uranium district: evidence from the Panna Maria Deposit. Econ Geol 77:541–556
Richard A, Pettke T, Cathelineau M, Boiron M-C, Mercadier J, Cuney M, Derome D (2010) Brine–rock interaction in the Athabasca basement (McArthur River U deposit, Canada): consequences for fluid chemistry and uranium uptake. Terra Nova 22:303–308
Scotese CR (1997) The PALEOMAP Project: paleogeographic atlas and plate tectonic software. University of Texas, Department of Geology, Austin
Shawe DR, Granger HC (1965) Uranium ore rolls—an analysis. Econ Geol 60:240–250
Shimuzu N, Hart SR (1981) Isotope fractionation in secondary mass spectrometry. J Appl Phys 53:1303–1311
Spirakis CS (1996) The roles of organic matter in the formation of uranium deposits in sedimentary rocks. Ore Geol Rev 11:53–69
Stacey JS, Kramers JD (1975) Approximation of terrestrial lead isotope evolution by a two-model. Earth Planet Sci Lett 26:207–221
Tardy Y, Nahon D (1985) Geochemistry of laterites, stability of Al-goethite, Al-hematite, and Fe3+-kaolinite in bauxites and ferricretes. An approach to the mechanism of concretion formation. Am J Sci 285:865–903
Thomas D (2003) Preliminary observations on the structural setting of uranium mineralization and alteration—Eagle Point deposit. Unpublished Cameco report, Canada
Thomas D, Matthews RB, Sopuck V (2000) Athabasca Basin (Canada) unconformity-type uranium deposits: exploration model, current mine developments and explorations directions. Geology and Ore deposits 2000: The Great Basin and Beyond, Geological Society of Nevada Symposium, pp 103–125
Trolard F, Tardy Y (1987) The stabilities of gibbsite, boehmite, aluminous goethites and aluminous hematites in bauxites, ferricretes and laterites as a function of water activity, temperature and particle size. Geochim Cosmichim Acta 51:948–957
Wilson MR, Kyser TK (1987) Stable isotope geochemistry of alteration associated with the Key Lake uranium deposit, Canada. Econ Geol 82:1540–1557
Acknowledgements
AREVA Resources Canada Inc and Cameco are gratefully acknowledged for technical support and scientific assistance during sampling. AREVA NC is thanked for its financial support and for permission to publish the results on which this paper is based. Many thanks to Dave Quirt and Alain Renaud for their help and assistance during the field trip and to Laure Sangély and Laurette Piani for their help relative to the REE analysis of uranium oxides. The authors thank P. Williams, G. Beaudoin and two anonymous reviewers for their constructive comments and editorial handling.
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Mercadier, J., Cuney, M., Cathelineau, M. et al. U redox fronts and kaolinisation in basement-hosted unconformity-related U ores of the Athabasca Basin (Canada): late U remobilisation by meteoric fluids. Miner Deposita 46, 105–135 (2011). https://doi.org/10.1007/s00126-010-0314-7
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DOI: https://doi.org/10.1007/s00126-010-0314-7