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Статті в журналах з теми "Uranium – Gisements – Nunavut (Canada)"
Shabaga, Brandi M., Mostafa Fayek, David Quirt, and Patrick Ledru. "Sources of sulphur for the Proterozoic Kiggavik uranium deposit, Nunavut, Canada." Canadian Journal of Earth Sciences 57, no. 11 (November 2020): 1312–23. http://dx.doi.org/10.1139/cjes-2018-0318.
Повний текст джерелаSharpe, Ryan, Mostafa Fayek, David Quirt, and Charlie W. Jefferson. "Geochronology and Genesis of the Bong Uranium Deposit, Thelon Basin, Nunavut, Canada." Economic Geology 110, no. 7 (September 22, 2015): 1759–77. http://dx.doi.org/10.2113/econgeo.110.7.1759.
Повний текст джерелаHiatt, Eric E., Sarah E. Palmer, T. Kurt Kyser, and Terrence K. O'Connor. "Basin evolution, diagenesis and uranium mineralization in the Paleoproterozic Thelon Basin, Nunavut, Canada." Basin Research 22, no. 3 (June 2010): 302–23. http://dx.doi.org/10.1111/j.1365-2117.2009.00415.x.
Повний текст джерелаShabaga, Brandi M., Mostafa Fayek, David Quirt, Charlie W. Jefferson, and Alfredo Camacho. "Mineralogy, geochronology, and genesis of the Andrew Lake uranium deposit, Thelon Basin, Nunavut, Canada." Canadian Journal of Earth Sciences 54, no. 8 (August 2017): 850–68. http://dx.doi.org/10.1139/cjes-2017-0024.
Повний текст джерелаChi, Guoxiang, Taylor Haid, David Quirt, Mostafa Fayek, Nigel Blamey, and Haixia Chu. "Petrography, fluid inclusion analysis, and geochronology of the End uranium deposit, Kiggavik, Nunavut, Canada." Mineralium Deposita 52, no. 2 (April 29, 2016): 211–32. http://dx.doi.org/10.1007/s00126-016-0657-9.
Повний текст джерелаGrare, Alexis, Antonio Benedicto, Olivier Lacombe, Anna Trave, Patrick Ledru, Mario Blain, and John Robbins. "The Contact uranium prospect, Kiggavik project, Nunavut (Canada): Tectonic history, structural constraints and timing of mineralization." Ore Geology Reviews 93 (February 2018): 141–67. http://dx.doi.org/10.1016/j.oregeorev.2017.12.015.
Повний текст джерелаQuirt, David, and Antonio Benedicto. "Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada)." Minerals 10, no. 6 (May 31, 2020): 512. http://dx.doi.org/10.3390/min10060512.
Повний текст джерелаRiegler, Thomas, Marie-France Beaufort, Thierry Allard, Anne-Catherine Pierson-Wickmann, and Daniel Beaufort. "Nanoscale relationships between uranium and carbonaceous material in alteration halos around unconformity-related uranium deposits of the Kiggavik camp, Paleoproterozoic Thelon Basin, Nunavut, Canada." Ore Geology Reviews 79 (December 2016): 382–91. http://dx.doi.org/10.1016/j.oregeorev.2016.04.018.
Повний текст джерелаGrare, Alexis, Olivier Lacombe, Julien Mercadier, Antonio Benedicto, Marie Guilcher, Anna Trave, Patrick Ledru, and John Robbins. "Fault Zone Evolution and Development of a Structural and Hydrological Barrier: The Quartz Breccia in the Kiggavik Area (Nunavut, Canada) and Its Control on Uranium Mineralization." Minerals 8, no. 8 (July 27, 2018): 319. http://dx.doi.org/10.3390/min8080319.
Повний текст джерелаSivarajah, Branaavan, Neal Michelutti, Xiaowa Wang, Christopher Grooms, and John P. Smol. "Limnological Characteristics Reveal Metal Pollution Legacy in Lakes near Canada’s Northernmost Mine, Little Cornwallis Island, Nunavut." ARCTIC 74, no. 2 (June 8, 2021): 167–74. http://dx.doi.org/10.14430/arctic72515.
Повний текст джерелаДисертації з теми "Uranium – Gisements – Nunavut (Canada)"
Grare, Alexis. "Tectono-metallogenic model of the Kiggavik uranium deposits, Nunavut, Canada." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS628.
Повний текст джерелаThe Paleoproterozoic to Mesoproterozoic (1750–1500 Ma) Athabasca (Saskatchewan) and Thelon (Nunavut) basins, Canada, host world-class high-grade uranium deposits. However, while being prospective, the Thelon Basin has been much less accessible and studied to date. The Kiggavik area, on the eastern border of the Thelon Basin was intensively explored by AREVA Resources Canada (ARC) until 2016, and hosts significant fracture-controlled uranium resources. Understanding the genesis, structural controls and timing of the mineralization is crucial to better understand the development and location of these deposits, and therefore to improve exploration strategies in this uranium district. This work focuses on the study of the complex multiphase fault and fracture network associated with uranium mineralization in the Kiggavik area. It consists in an integrated and multiscale study combining meso- and microstructural analyses from field and drill cores with petrological, geochemical and geochronological analyses. Geophysical and geological data from the recently discovered Contact prospect as well as from other nearby deposits and prospects enabled us to decipher the tectono-metallogenic multi-stage model at the scale of the entire Kiggavik area. Our results show that the main ENE-WSW and NE-SW fault zones formed earlier during the Thelon and Trans-Hudsonian orogenies and were mineralized in four stages, U0, U1, U2, U3, with distinctive fracture, alteration and mineralization patterns. U0, inferred of magmatic origin, likely occurred at ca. 1830 Ma and is related to micro-brecciation and weak clay-alteration under a yet poorly constrained stress, likely a WSW-ENE shortening. This event is followed by intense quartz brecciation, iron oxidation and veining at ca. 1750 Ma. This silicifying event that predates deposition of the Thelon formation is of magmatic epithermal origin; it caused pervasive silicification of former fault zones, giving birth to the so-called Quartz Breccia that compartimentalized subsequent fracturing and behaved as a barrier for mineralizing fluids. Both the U0 mineralization and the subsequent silicifying events reflect the importance of pre-Thelon magmatic-related fracturing/fluid circulation events on controlling the future development and location of later unconformity-type uranium deposits. U1, U2 and U3 postdate deposition of the Thelon formation; U1 and U2 mineralization events are associated with two fracturing stages that occurred in response to a far-field stress that evolved from WNW-ESE σ1 and NNW-SSE σ3 to NE-SW σ1 and NW-SE σ3, respectively; both formed at ~1500-1300 Ma and are related to circulation of Thelon-derived U-bearing basinal brines. A post U1/U2, but pre-MacKenzie dikes, NE-SW oriented extensional stress caused the normal-dextral offset of the orebodies by reactivating NNW-SSE and E-W faults. This fracturing event triggered circulation of hot acidic fluids, desilicifying, illitizing and bleaching the host-rock, remobilizing and reprecipitating previous uranium stock. U3 is linked to uranium redistribution/reconcentration along redox fronts and occurred through weak reopening of the fracture network enhancing percolation of meteoric fluids at 500-300 Ma. Our study shows that unlike in the Athabasca Basin where uranium deposits are unconformity-related in type and where clay alteration halos are spatially and genetically associated to ore bodies, in the Kiggavik area (1) uranium deposits are of mixed type evolving from magmatic-related (U0) to unconformity-related (U1-U2), with a final perturbation by meteoric fluid percolation (U3), and (2) the strongest clay alteration event postdates the main stages of mineralization (U0 to U2). Our study also emphasizes the need of accurate structural analyses combined with petro-geochemical and geochronological studies to better constrain the genesis and the structural plumbing responsible for ore deposits formation and to help provide more [...]
Maneglia, Nelly. "Minéraux indicateurs du district aurifère de Meliadine (Nunavut, Canada)." Master's thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27846.
Повний текст джерелаThe Meliadine Gold District is located about 25 kilometres north of Rankin Inlet, Nunavut (Canada), in the Archean Rankin Inlet greenstone belt. The bedrock is composed of greenschist facies metamorphic sedimentary rocks including Banded Iron Formations (BIF), interbedded with mafic volcanic rocks. Auriferous mineralization is distributed along the Pyke fault. Iron formations host the gold mineralization composed of sulfide-rich mesothermal quartz veins. Gold is mainly disseminated in BIF and quartz-carbonate veins. Seven till samples were collected parallel to the direction of ice flow at the Mustang showing, along a 2 km transect. Two are located up-ice and five down-ice in the dispersal train. The composition of magnetite, tourmaline, scheelite, arsenopyrite and galena has been investigated by Electron Probe Micro-Analyser and Laser Ablation Inductively Coupled Plasma Mass Spectrometry. The chemical composition of these indicator minerals in the deposits is compared with the composition of grains extracted from the till samples. Magnetite from BIF is enriched in Al and bears chemical similarities with hydrothermal magnetite, whereas magnetite from magmatic and metamorphic sources has a higher content in V. Tourmaline from quartz-carbonate veins hosted by mafic rocks is characterised by a flat Rare Earth Elements (REE) pattern with a positive europium anomaly also found in tourmaline from till samples down-ice of the Mustang showing. Scheelite with a bell-shape REE pattern and a negative europium anomaly from the Mustang showing is also found in till samples within the dispersal train. Gold grain abundance, as well as the signature of scheelite and tourmaline reflecting the gold deposits allow detecting the partially eroded gold mineralization.
De, Bronac de Vazelhes Victor, and Bronac de Vazelhes Victor De. "Étude de la dispersion d'un gisement d'or dans les sédiments glaciaires : le cas d'Amaruq (Nunavut, Canada)." Master's thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37057.
Повний текст джерелаLa minéralisation aurifère de la propriété Amaruq (Nunavut, CA) est recouverte par divers sédiments glaciaires ayant formé des traînées de débris minéralisés sur des surfaces importantes. Ce projet a pour objectif de caractériser la signature minéralogique et géochimique du gisement aurifère dans le till de surface afin de développer des méthodes de prospection pour les travaux d’exploration. 61 échantillons de till ont été récoltés le long de quatre transects pour déterminer les variations de composition dans la direction principale de l’écoulement glaciaire (NNO). Quatre profils verticaux d’ostioles, un par transect, ont été échantillonnés pour documenter la variation de la signature géochimique avec la profondeur. La signature chimique de la scheelite dans le gisement est comparée à celle retrouvée dans le till et permet de tester son utilisation comme outil de prospection glacio-sédimentaire. Trois des quatre profils d’ostioles présentent des concentrations stables des éléments traces avec la profondeur, indiquant une bonne homogénéisation du till par les processus cryogéniques. Les ostioles sont donc un milieu d’échantillonnage pertinent en région de pergélisol. Les analyses en composantes principales (ACP) de la géochimie des échantillons d’une campagne de till fournie par Mines Agnico Eagle ltée (AEM), et les données des transects, décrivent la variance de la roche encaissante mafique/ultramafique et de la minéralisation aurifére (CP1 et CP2 respectivement). Le krigeage des scores de la CP1 et CP2 indiquent des trains de dispersion vers le NNO, en aval glaciaire des zones minéralisées. Les comptages des minéraux indicateurs (MI : or et scheelite) augmentent de façon importante à environ 1.4 km en aval de la minéralisation dans le secteur est de la propriété, dans un till distal formant des formes drumlinoides. Dans le secteur ouest, recouvert d’un till proximal formant des crêtes morainiques, les comptages des MI et les scores de la CP1 augmentent directement en aval de la minéralisation. Les différences de distance de transport entre ces deux secteurs reflètent un changement de la dynamique glaciaire et démontrent l’importance du contexte local dans les travaux de prospection glaciaire. La comparaison de la signature géochimique de la scheelite entre le gisement et et des échantillons de till du transect de Whale Tail, grâce à des diagrammes discriminants et spectres des terres rares, montrent d’importantes similitudes, démontrant sa potentielle utilisation en prospection glacio-sédimentaire pour des gisements de type orogéniques.
On the Amaruq property (Nunavut, CA), the gold mineralization is covered by a patchwork of glacial sediments, including trains of mineralized debris dispersed over large surfaces. This project aims to define the deposit mineralogical and multi-elemental signatures in surface sediments to guide exploration in the area. A total of 61 samples were collected from frost boils along four NNW transects, parallel to the major ice flow direction, in order to assess the spatial variability of the deposit signature using till matrix geochemistry and indicator minerals. Four profiles in frost boils were sampled, one in each transect, in order to document trace elements depth variation. The scheelite geochemical signature from the deposit is compared to that in till from the Whale Tail transect to test its applicability in drift prospecting. Three out of four frost boil profiles exposed constant trace elements concentrations at depth, reflecting a good till homogenization by cryoturbation. Therefore, frost boils are a suitable medium of sampling for exploration purpose in permafrost terrain. Principal component analysis (PCA) of a previous till survey by Agnico Eagle Mines ldt (AEM) and transect samples define the ultramafic/mafic host rock of the mineralization and a pathfinder element suite characteristic of lode gold deposits (PC1 and PC2, respectively). Kriging of PC1 and PC2 defines a dispersal train oriented NNW, down ice of known mineralization. In the eastern part of the property, covered mostly by a distal till forming drumlinoid ridges, indicator mineral counts (IM: gold and scheelite) increase to a maximum approximately 1.4 km down ice from the outcropping zone. Western transects, largely covered by a proximal till forming morainal ridges, show a sharp increase of counts directly down-ice of mineralization. The difference in glacial transport between these two sectors represents a local change of ice dynamic and shows the importance of understanding the local context in exploration when interpreting glacial dispersal patterns. The comparison of the trace element signature between the deposit and the till scheelite using discriminant diagrams and REE abundance shows similarities, supporting its usefullness in drift prospecting for orogenic gold deposits.
On the Amaruq property (Nunavut, CA), the gold mineralization is covered by a patchwork of glacial sediments, including trains of mineralized debris dispersed over large surfaces. This project aims to define the deposit mineralogical and multi-elemental signatures in surface sediments to guide exploration in the area. A total of 61 samples were collected from frost boils along four NNW transects, parallel to the major ice flow direction, in order to assess the spatial variability of the deposit signature using till matrix geochemistry and indicator minerals. Four profiles in frost boils were sampled, one in each transect, in order to document trace elements depth variation. The scheelite geochemical signature from the deposit is compared to that in till from the Whale Tail transect to test its applicability in drift prospecting. Three out of four frost boil profiles exposed constant trace elements concentrations at depth, reflecting a good till homogenization by cryoturbation. Therefore, frost boils are a suitable medium of sampling for exploration purpose in permafrost terrain. Principal component analysis (PCA) of a previous till survey by Agnico Eagle Mines ldt (AEM) and transect samples define the ultramafic/mafic host rock of the mineralization and a pathfinder element suite characteristic of lode gold deposits (PC1 and PC2, respectively). Kriging of PC1 and PC2 defines a dispersal train oriented NNW, down ice of known mineralization. In the eastern part of the property, covered mostly by a distal till forming drumlinoid ridges, indicator mineral counts (IM: gold and scheelite) increase to a maximum approximately 1.4 km down ice from the outcropping zone. Western transects, largely covered by a proximal till forming morainal ridges, show a sharp increase of counts directly down-ice of mineralization. The difference in glacial transport between these two sectors represents a local change of ice dynamic and shows the importance of understanding the local context in exploration when interpreting glacial dispersal patterns. The comparison of the trace element signature between the deposit and the till scheelite using discriminant diagrams and REE abundance shows similarities, supporting its usefullness in drift prospecting for orogenic gold deposits.
Mercadier, Julien Cuney Michel. "Conditions de genèse des gisements d'uranium associés aux discordances protérozoïques et localisés dans les socles. Exemple du socle du bassin d'Athabasca (Saskatchewan, Canada)." S. l. : S. n, 2008. http://www.scd.inpl-nancy.fr/theses/2008_MERCADIER_J.pdf.
Повний текст джерелаPhilippe, Sylvie. "Systématique U-Pb et évolution comparée des minéralisations uranifères du bassin d'Athabasca (Saskatchewan, Canada) : cas des gisements de la structure Carswell et de Cigar Lake." Montpellier 2, 1988. http://www.theses.fr/1988MON20095.
Повний текст джерелаSangely, Laure. "Développement de l'analyse in situ de la composition isotopique du carbone organique par sonde ionique : apports à l'étude de l'origine des bitumes associés aux gisements d'uranium de l'Athabasca (Canada) et du Witwatersrand (Afrique du Sud)." Vandoeuvre-les-Nancy, INPL, 2004. http://www.theses.fr/2004INPL074N.
Повний текст джерелаRichard, Antonin. "Circulation de saumures à la discordance socle / couverture sédimentaire et formation des concentrations uranifères protérozoïques (Bassin de l'Athabasca, Canada)." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL092N/document.
Повний текст джерелаFluid circulations between crystalline basements and their sedimentary covers are major events for element transfer in the crust. In numerous settings, basinal fluids penetrate the low-permeability basement, interact with basement lithologies, leach metals, leading to metal concentrations, notably Pb, Zn, Cu, Ag and U. Unconformity-related uranium deposits from the Proterozoic Athabasca Basin (Canada) are crucial witnesses and useful tools for the understanding of mechanisms and consequences of such fluid events. Fluid inclusions allow us to directly sample and analyze paleofluids. Despite analytical difficulties, these micrometer size objects provide key information on fluid properties. Available analytical techniques (microthermometry, LA-ICP-MS, crush-leach, in-vacuo crushing) provide reconstruction of temperature, pressure, detailed fluid chemistry, including metal concentrations, as well as isotopic composition of water hydrogen, chlorine and of dissolved CO2 carbon. In addition, analysis of isotopic composition of oxygen and carbon from minerals in which fluid inclusions are trapped provide supplementary information on fluid temperatures and fluid-rock interactions. This approach was used on six uranium deposits from the Athabasca Basin and provided the following results, which can be potentially generalized to the entire basin. (1) Two brines, a calcium-rich brine and a sodium-rich brine have circulated and mixed at the base of the basin and in the basement at the time of formation of uranium deposits, at temperature close to 150 ± 30°C. (2) Both brines have transported uranium, whose exceptional and highly heterogeneous concentrations (0.2 to 600 ppm) indicate that it was leached in the basement. (3) Both brines share a common origin and were formed mainly by surface evaporation of seawater and mixing with fluids originating from dissolution of evaporitic minerals. (4) The calcium-rich brine was formed by interaction between the sodium-rich brine and basement lithologies. (5) Interaction with basement minerals and graphite, water radiolysis, and bitumen synthesis were the main controls on the oxygen, hydrogen and carbon isotopic composition of brines
Mercadier, Julien. "Conditions de genèse des gisements d'uranium associés aux discordances protérozoïques et localisés dans les socles. Exemple du socle du bassin d'Athabasca (Saskatchewan, Canada)." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL108N/document.
Повний текст джерелаNew basement-hosted uranium deposits in Athabasca Basin (Saskatchewan, Canada) were recently discovered. This ore type is now a new exploration target. The formation processes of basement-hosted ores are discussed and their discovery is not obvious. To better understand this deposit type, a multidisciplinary study has been focussed on three deposits: Eagle Point, Millennium and P-Patch. The basement-hosted uranium oxides have variable chemical characteristics function of their crystallisation and posterior alteration conditions. U-Pb isotopic ages are in accordance with uranium oxides localized at the unconformity. The same tendency is observed too for Rare Earth Elements (REE) concentrations. Physico-chemical conditions and fluid circulations are thus close to for the two types of deposit. The brines associated to deposit formation circulate in the basement, for a part, thanks to metamorphic structures and microstructures reopenings under the same stress field than those occurring during the late metamorphic episodes. Microfracturing determines directly the alteration degree of the rock and thus the chemistry evolution of the brines. Basement alteration by brines is progressive and favours the successive destabilisation of mineral, permitting the transfer of several elements from the basement to the basin. Basement accessory minerals are altered to totally dissolved, indicating that the basement is a main source of uranium and REE for the mineralization formation. Late meteoric fluids (<300 Ma) destabilized previous uranium oxides and favour the crystallization of uranium redox-front in hydrothermal alteration halo
Derome, Donatienne. "Evolution et origine des saumures dans les bassins protérozoi͏̈ques au voisinage de la discordance socle/couverture : l'exemple de l'environnement des gisements d'uranium associés aux bassins Kombolgie (Australie) et Athabasca (Canada)." Nancy 1, 2002. http://www.theses.fr/2002NAN10230.
Повний текст джерелаLorilleux, Guillaume. "Les brèches associées aux gisements d'uranium de type discordance du bassin Athabasca (Saskatchewan, Canada)." Nancy 1, 2001. http://docnum.univ-lorraine.fr/public/INPL_T_2001_LORILLEUX_G.pdf.
Повний текст джерелаUnconformity-type uranium deposits in the Athabasca Basin (Canada) are commonly hosted and surrounded by breccia bodies in quartzose sandstones. In order to understand the mechanisms of breccia formation and the ir significance for the genesis of uranium deposits, the breccias associated with U mineralizations of the Shea Creek prospect and Sue C open pit, and with the Y-REEU mineralization of the Maw Zone were studied. Structural mapping and 3D modeling evidence the control of breccia geometries by reverse faults that are graphite-rich in the basement. The study of mineral paragenesis and calculations of U-Pb chemical ages at Shea Creek reveal 3 breccia phases with sudoite-dravite, Fe-chlorite and hematite-siderite cements. These breccias developed over more than 1 Ga respectively during 3 stages of tectonic reactivations and/or basin uplift main! y between 1. 52 and 1. 25 Ga during the main event of primary uranium deposition and at about 900 and 350 Ma during phases of uranium remobilization. The breccias coeval with the genesis of the primary mineralization developed in 3 stages characterized by fractal analysis of fragment shapes expressing their degree ofmaturity. The first stage of breccia formation has been triggered by a reactivation of graphite-rich reverse faults inducing localized tectonic fracturing in the core offaults and widespread hydraulic fracturing in early silicified zones. The second stage corresponds to quartz dissolution due to the vertical circulation of a basement t1uid undersaturated relative to silica in fractured sandstones. Calculated minimum t1uid/rock ratios are very high with values of3,000 at the Maw Zone and 38,000 in the Sue « zones à boules» ret1ecting the decrease of dissolution intensity with the increase of distance to the unconformity. The minimum volume of basement t1uids that have circulated through the breccias is about 1 km3 • Mass balance calculations show an input of U, V, Mg, B, Al, K, Bi, Ni, Co, Mo, As, S, W, Zn, Y and REE, in accordance with the new formation of illite, Mg-rich sudoite and dravite and with the polymetallic sandstone-hosted mineralization. The third stage is expressed by gravity-driven collapse phenomenons resulting from the cavities created by quartz dissolution. In « zones à boules » developed in the core of faults, it is the tectonic contraction that progressively closed the open spaces formed by quartz dissolution. Volume Joss values reach 90 % in zones of intense dissolution close to the unconformity. In steeply dipping fault zones, collapse propagated up to more than 250 rn above the unconformity as observed at the Maw Zone, like in a karst. Uranium deposition induced by mixing of the reducing basement fluid undersaturated relative to quartz (> 250°C) with diagenetic oxidizing basin fluids (< 240°C) occurred during about severa! million years, simultaneously with quartz dissolution providing the space needed to form the massive mineralizations
Тези доповідей конференцій з теми "Uranium – Gisements – Nunavut (Canada)"
Burron, Ian, Mostafa Fayek, and Julie Brown. "Recent Uranium Mobility in the Kiggavik Region, Nunavut, Canada: Implications for the Effects of Glaciation on a DGR." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9093.
Повний текст джерела