Actinides in Geology, Energy, and the Environment. Petrography and geochronology of the Pele Mountain quartz-pebble conglomerate uranium deposit, Elliot Lake District, Canada
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Laura Bergen
und
Mostafa Fayek
Abstract
Uranium deposits older than about 2200 Ma are generally hosted within quartz-pebble conglomerates and are a source of economic uranium. The genesis of these deposits is controversial and genetic models include hydrothermal, detrital/placer, and modified placer. Petrography of the uranium mineralogy from the Pele Mountain quartz-pebble conglomerate uranium deposit of the Elliot Lake district, Canada, shows that the dominant uranium minerals are thorite [(Th,U)SiO4] and brannerite [(U,Ca,Ce) (Ti,Fe)2O6]. Uranium-lead (U-Pb) and lead-lead (Pb-Pb) isotopic analyses of thorite, brannerite, and galena were obtained using secondary ion mass spectrometry. Thorite has U-Pb age of 2489 ± 24 in the quartzose conglomerate and 280 ± 67 Ma in the quartz arenite. Brannerite has a U-Pb age of 2403 ± 120 Ma. Thorite Pb-Pb ages range from 521 ± 19 to 248 ± 8 Ma in the arenite and from 2453 ± 12 to 935 ± 27 Ma in the conglomerate, whereas brannerite Pb-Pb ages are between 1335 ± 0.11 and 848 ± 13 Ma. Galena has a Pb-Pb age of 2659 ± 8 Ma, which likely represents the age of the source formation that produced detrital galena. The rounded texture and U-Pb age of the conglomerate thorite corresponds to the depositional age of the host conglomerate bed of the Matinenda Formation, suggesting a detrital origin. The young U-Pb age of the thorite in the arenite represents the age of a resetting event. The brannerite, which replaces rutile, has a U-Pb consistent with fluid events associated with the Blezardian or Penokean Orogenic events, and is likely of hydrothermal origin. Therefore, based on the textures and variable ages of the uranium and sulfide minerals, the Pele Mountain quartz-pebble conglomerate uranium deposit is interpreted to be a modified placer-type deposit.
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
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Artikel in diesem Heft
- Actinides in Geology, Energy, and the Environment. Petrography and geochronology of the Pele Mountain quartz-pebble conglomerate uranium deposit, Elliot Lake District, Canada
- Celadonite in continental flood basalts of the Columbia River Basalt Group
- Thermodynamics of manganese oxides: Effects of particle size and hydration on oxidation-reduction equilibria among hausmannite, bixbyite, and pyrolusite
- Grossular: A crystal-chemical, calorimetric, and thermodynamic study
- Redetermination of high-temperature heat capacity of Mg2SiO4 ringwoodite: Measurement and lattice vibrational model calculation
- Thermal behavior of realgar As4S4, and of arsenolite As2O3 and non-stoichiometric As8S8+x crystals produced from As4S4 melt recrystallization
- Thermodynamics of the magnetite-ulvöspinel (Fe3O4-Fe2TiO4) solid solution
- Raman spectroscopy of (Ca,Mg)MgSi2O6 clinopyroxenes
- In-situ Raman spectroscopic study of sulfur speciation in oxidized magmatic-hydrothermal fluids
- Structural anisotropy and annealing-induced nanoscale atomic rearrangements in metamict titanite
- Hydrous fluid as the growth media of natural polycrystalline diamond, carbonado: Implication from IR spectra and microtextural observations
- Metastable equilibrium in the C-H-O system: Graphite deposition in crustal fluids
- Controlled morphogenesis of amorphous silica and its relevance to biosilicification
- Structural relaxation in tetrahedrally coordinated Co2+ along the gahnite-Co-aluminate spinel solid solution
- Limitations of Fe2+ and Mn2+ site occupancy in tourmaline: Evidence from Fe2+- and Mn2+-rich tourmaline
- Isothermal compression of face-centered cubic iron
- Bonding and structural changes in siderite at high pressure
- Energetics and kinetics of carbonate orientational ordering in vaterite calcium carbonate
- Growth process and crystallographic properties of ammonia-induced vaterite
- Argesite, (NH4)7Bi3Cl16, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy: A first example of the [Bi2Cl10]4− anion
- Experimental study of mineral equilibria in the system K2O(Li2O)-Al2O3-SiO2-H2O-HF at 300 to 600 °C and 100 MPa with application to natural greisen systems
- Tobelite and NH+4-rich muscovite single crystals from Ordovician Armorican sandstones (Brittany, France): Structure and crystal chemistry
- The enigmatic iron oxyhydroxysulfate nanomineral schwertmannite: Morphology, structure, and composition
- Ferric iron and water incorporation in wadsleyite under hydrous and oxidizing conditions: A XANES, Mössbauer, and SIMS study
- Kircherite, a new mineral of the cancrinite-sodalite group with a 36-layer stacking sequence: Occurrence and crystal structure
- Molecular models of birnessite and related hydrated layered minerals
- Letter: Gold-telluride nanoparticles revealed in arsenic-free pyrite
- Letter: XAS evidence for the stability of polytellurides in hydrothermal fluids up to 599 °C, 800 bar
