 | Hidaka, Hiroshi, Janeczek, Janusz, Skomurski, Frances N., Ewing, Rodney C., Gauthier-Lafaye, François (2005) Geochemical fixation of rare earth elements into secondary minerals in sandstones beneath a natural fission reactor at Bangombé, Gabon. Geochimica et Cosmochimica Acta, 69 (3) 685-694 doi:10.1016/j.gca.2004.07.019 | Journal (article/letter/editorial) | | sandstones beneath a natural fission reactor at Bangombé, Gabon HIROSHI HIDAKA,1,2,* JANUSZ JANECZEK,3 FRANCES...RODNEY C. EWING,4 and FRANÇOIS GAUTHIER-LAFAYE5 1 Department of Earth and Planetary Systems Science, Hiroshima...University, Higashi-Hiroshima 739-8526, Japan 3 Department of Earth Sciences, University of Silesia, ul... Bedzinska 60, PL-41-200 Sosnowiec, Poland 4 Department of Geological Sciences, University of Michigan...coffinite, françoisite, uraniferous goethite, and uraninite found in a sandstone layer 30 to 110 cm beneath |  | | Journal (article/letter/editorial) | | micro-minerals bearing fission products in the Oklo and Bangombé natural reactors: A review of a natural analogue...migration of fission products H. Hidaka ∗ , M. Kikuchi Department of Earth and Planetary Systems Science, Hiroshima...Fission Rare earth elements (REE) Natural reactor Gabon Migration a b s t r a c t In the Precambrian, parts...the Oklo, Okélobondo and Bangombé uranium deposits of the Republic of Gabon, central Africa, functioned...fission reactors. Many elements in the Oklo and Bangombé uranium deposits show variations in isotopic composition |  | Deditius, A. P., Utsunomiya, S., Wall, M. A., Pointeau, V., Ewing, R. C. (2009) Crystal chemistry and radiation-induced amorphization of P-coffinite from the natural fission reactor at Bangombe, Gabon. American Mineralogist, 94 (5) 827-837 doi:10.2138/am.2009.3114 | Journal (article/letter/editorial) | | P-coffinite from the natural fission reactor at Bangombé, Gabon Artur P. DeDitius,1,* sAtoshi utsunomiyA,2...1 Véronique PointeAu,3 AnD roDney C. ewing1 1 Department of Geological Sciences, University of Michigan...Michigan, Ann Arbor, Michigan 48109-1005, U.S.A. Department of Chemistry, Kyushu University, Ropponmatsu, 4-2-1...P)O4·H2O, from the natural nuclear reactor at Bangombé, Gabon (depth 12.25 m), has been examined as an important...important primary mineral and alteration product of uraninite under reducing conditions. Based on electron microprobe |  | | Journal (article/letter/editorial) | | 1016/j.gca.2004.07.013 Uraninite recrystallization and Pb loss in the Oklo and Bangombé natural fission reactors...reactors, Gabon LENA Z. EVINS,1,* KELD A. JENSEN,2,3 and RODNEY C. EWING2 2 1 Swedish Museum of Natural...Natural History, Stockholm, Sweden Department of Geological Sciences, University of Michigan, Ann Arbor,...and Bangombé natural fossil fission reactors formed ca. 2 Ga ago in the Franceville basin, Gabon. The...The response of uraninite in the natural reactors to different geological conditions has implications for |  | | Journal (article/letter/editorial) | | Review of In Situ Isotopic Studies of the Oklo and Bangombé Natural Fission Reactors Using Microbeam Analytical...Analytical Techniques Hiroshi Hidaka Department of Earth and Planetary Sciences, Nagoya University, Chikusa-ku...have been found in and around the Oklo and the Bangombé natural reactors. In the past two decades, microbeam...of various elements in and around the Oklo and Bangombé natural reactors vary significantly because of...review the isotopic results related to the Oklo and Bangombé reactors mainly based on my works using a sensitive |  | Fayek, Mostafa, Utsunomiya, Satoshi, Ewing, Rodney C., Riciputi, Lee R., Jensen, Keld A. (2003) Oxygen isotopic composition of nano-scale uraninite at the Oklo-Okélobondo natural fission reactors, Gabon. American Mineralogist, 88 (10) 1583-1590 doi:10.2138/am-2003-1021 | Journal (article/letter/editorial) | | composition of nano-scale uraninite at the Oklo-Okélobondo natural fission reactors, Gabon MOSTAFA FAYEK,1,3...electron microscopy (HRTEM), were used to show that uraninite from the Oklo-Okélobondo natural fission reactors...Oklo-Okélobondo and Bangombé U deposits. However, the post-criticality evolution of the uraninite is only partially...deposits is complicated by the susceptibility of uraninite to alteration and radiation damage (e.g., Fayek...and micro- scale. Oxygen isotope analysis of uraninite on the micrometer scale has been demonstrated |  | Meisser, N., Brugger, J., Ansermet, S., Thelin, P., Bussy, F. (2010) Francoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis. American Mineralogist, 95 (10) 1527-1532 doi:10.2138/am.2010.3413 | Journal (article/letter/editorial) | | hypogene minerals: allanite-(Ce), monazite-(Ce), ±uraninite at Les Marécottes; monazite-(Ce), ishikawaite-samarskite...Permo-Triassic) resulted in the precipitation of uraninite and pyrite in breccia and veins. A second, later...arsenopyrite produced acidic fluids, which reacted with uraninite, fluorapatite, and silicates from the host rock...sulfate-rich waters. These waters reacted with uraninite, clinochlore, illite, calcite, and siderite to...Paralana Hot Springs (Brugger et al. 2005). The province contains many small Paleozoic hematite-U-CuNb-REE |  | | Journal (article/letter/editorial) | | Deditius ⁎, Satoshi Utsunomiya 1, Rodney C. Ewing Department of Geological Sciences, University of Michigan...Deditius). 1 Current address. Kyushu University, Department of Chemistry, Ropponmatsu, 4-2-1, Chuou-ku, Fukuoka-shi...amounts of associated minerals, such as illite, uraninite and REE-phosphates, which is often the 34 A...composition of coffinite is from the U-deposits in Oklo, Gabon (e.g., Janeczek, 1999; Jensen and Ewing, 2001; Bros...deposits coffinite is an alteration product of uraninite, UO2 + x, and forms crystals smaller than 5 μm |  | | Journal (article/letter/editorial) | | 152-8551, Japan (ueno.y.ac@m.titech.ac.jp) 2 Department of Applied Chemistry, Tokyo Institute of Technology...Technology, Meguro, Tokyo, 152-8551, Japan 3 Department of Environmental Science and Technology, Tokyo Institute...ULMER1*, O. MÜNTENER2 AND R. ALONSO PEREZ1 1 Department of Earth Sciences, ETH-Zurich, CH-8092 Zurich...MEKALA1 AND M.J. WHITEHOUSE2 M.J. UNSWORTH 1 Department of Earth Sciences, Laurentian University, Sudbury...ningyoite from the natural nuclear reactor at Bangombé, Gabon T. USHIKUBO1*, N.T. KITA1, A.J. CAVOSIE2, |  | René, Miloš, Dolníček, Zdeněk, Sejkora, Jiří, Škácha, Pavel, Šrein, Vladimír (2019) Uraninite, Coffinite and Ningyoite from Vein-Type Uranium Deposits of the Bohemian Massif (Central European Variscan Belt) Minerals, 9 (2) 123 doi:10.3390/min9020123 | Journal (article/letter/editorial) | | minerals Article Uraninite, Coffinite and Ningyoite from Vein-Type Uranium Deposits of the Bohemian...Czech Republic, 182 09 Prague, Czech Republic Department of Mineralogy and Petrology, National Museum...Abstract: Uraninite-coffinite vein-type mineralisation with significant predominance of uraninite over coffinite...Textural features and the chemical composition of uraninite, coffinite and ningyoite were studied using an...an electron microprobe. Collomorphic uraninite was the only primary uranium mineral in all deposits studied |  | | Journal (article/letter/editorial) | | Technology, Rechbauerstrasse 12, 8010 Graz, Austria Department of Earth and Environmental Sciences, University...often reported to be an alteration product of uraninite under Si-rich, low-temperature, reducing conditions...significant amorphization of P-coffinite from Bangombé, Gabon (Deditius et al. 2009). Synthesis of thorite...associated apatite-(CaF) and garnet (Fig. 1e). No uraninite and/or thorianite, ThO2, were observed in the...A-site cations, possibly caused by inclusions of uraninite in thorite, was reported by Johan and Johan (2005) |  | | Journal (article/letter/editorial) | | Kenji Horie a , Françoise Gauthier-Lafaye c a Department of Earth and Planetary Systems Science, Hiroshima...sandstone near the Oklo uranium deposit, Republic of Gabon, show extremely low 207Pb/206Pb (∼ 0.0158) isotopic...interest to understand the ⁎ Corresponding author. Department of Earth and Planetary Systems Science, Hiroshima...geological media. The Oklo uranium deposit, Republic of Gabon, central Africa, is a unique example of a natural...uranium ore located in the southeastern part of Gabon, central Africa, is known as natural fission reactors |  | | Journal (article/letter/editorial) | | beneath a natural fission reactor at Bangomb6, Gabon JANUSZ JANECZEK RODNEY EWING SPONTANEOUS fission...reactions occurred in several uranium deposits in SE Gabon approximately two billion years ago. The reactor...of high-grade uranium ore mantled by illite Department of Earth Sciences, University of Silesia, uL...uL Bedzinska 60, PL-41-200 Sosnowiec, Poland Department of Earth and Planetary Sciences, University of...pleochroic. Some of the grains contain relics of uraninite (Fig. 1). Inclusions of a Ru- and As-bearing mineral |  | Dubois, Manon, Lopez, Michel, Orberger, Beate, Gay, Aurélien, Moussavou, Mathieu, Pambo, Florent, Rodrigues, Sophie (2017) The 2.1 Ga-old injectite network of the Franceville Basin, Gabon: Architecture, origin and implications on manganese mineralization. Precambrian Research, 302. 255-278 doi:10.1016/j.precamres.2017.09.022 | Journal (article/letter/editorial) | | 1Ga-old injectite network of the Franceville Basin, Gabon: Architecture, origin and implications on manganese...1Ga-old injectite network of the Franceville Basin, Gabon: Architecture, origin and implications on manganese...1Ga-old injectite network of the Franceville Basin, Gabon: Architecture, origin and implications on manganese... Franceville, Gabon e COMILOG SA- Société du groupe Eramet, B.P. 27-28 Moanda, Gabon Bulletin: Precambrian...drill-core sections in the 2.1-Gaold Franceville basin, Gabon, provide evidence for a large-scale injectite network |  | | Journal (article/letter/editorial) | | OLDEST OBSERVED PRIMARY URANINITE Ryan SHARPE§ and Mostafa FAYEK Department of Geological Sciences, 240...micro-analytical technique, was used to date uraninite from the Huron Claim pegmatite in southeastern...petrography shows that there are zones in the uraninite grains that have undergone varying degrees of...In situ U–Pb isotopic analysis shows that the uraninite from the Huron Claim pegmatite is highly discordant...age of the uraninite is interpreted to be 2575 ± 38 Ma. A comparison of this age with uraninite from other |  | Kirchenbaur, Maria, Maas, Roland, Ehrig, Kathy, Kamenetsky, Vadim S., Strub, Erik, Ballhaus, Chris, Münker, Carsten (2016) Uranium and Sm isotope studies of the supergiant Olympic Dam Cu–Au–U–Ag deposit, South Australia. Geochimica et Cosmochimica Acta, 180. 15-32 doi:10.1016/j.gca.2016.01.035 | Journal (article/letter/editorial) | | within a granite of the 1.59 Ga Gawler Silicic Province. Emerging evidence indicates that both the breccia...preferentially partitions into the reduced species, i.e., uraninite (UO2). Theory further predicts systematic differences...U ore deposits and for different U minerals (uraninite, coffinite; e.g., Chernyshev et al., 2014; Murphy...deposit in general. Limited published data for uraninite and U ore concentrate from Olympic Dam indicate...present in the deposit (Ehrig et al., 2012). Uraninite, coffinite and brannerite are the three dominant |  | | Journal (article/letter/editorial) | | Branch Road NW, Washington, D.C. 20015, U.S.A. Department of Geological Sciences, University of Michigan...Avenue, Ann Arbor, Michigan 48109-1005, U.S.A. 3 Department of Earth and Planetary Sciences, Johns Hopkins...fluids from which the first U4+ and Th4+ minerals, uraninite (ideally UO2), thorianite (ThO2), and coffinite...of large low-grade concentrations of detrital uraninite (containing several wt% Th) in the Witwatersrand-type...anoxic fluvial environment. Abiotic alteration of uraninite and coffinite, including radiolysis and auto-oxidation |  | | Journal (article/letter/editorial) | | Barcelona, Spain E-mail: jbruno@enviros.biz 3 Department of Geological Sciences, University of Michigan...the Office of Civilian Radioactive Waste in the Department of Energy has created a Source Term Research...and draws on early work on the dissolution of uraninite (Grandstaff 1976; Parks and Pohl 1988). The main...variety of geologic settings (Bruno et al. 2002). Uraninite, UO2+x, and UO2 in spent fuel share identical...particular relevance to nuclear waste management is in Gabon, where at least 15 natural fission reactors have |  | | Journal (article/letter/editorial) | | P-U-bearing phases. Uraninite is rare and was only found in the Variscan granite. Some uraninite analyses show...tendency to crystallize as uraninite (Cuney & Friederich 1987, Förster 1999). Uraninite is the most important... and economic value (Finch & Murakami 1999). Uraninite exposed to oxidizing conditions may give rise... and contains on average 10 ppm U, hosted in uraninite and other U-bearing minerals, such as monazite...using a Jeol electron-microprobe JX8600 at the Department of Earth Sciences, University of Bristol, U.K |  | Macmillan, Edeltraud, Cook, Nigel J., Ehrig, Kathy, Ciobanu, Cristiana L., Pring, Allan (2016) Uraninite from the Olympic Dam IOCG-U-Ag deposit: Linking textural and compositional variation to temporal evolution. American Mineralogist, 101 (6) 1295-1320 doi:10.2138/am-2016-5411 | Journal (article/letter/editorial) | | SPECIAL COLLECTION: FROM MAGMAS TO ORE DEPOSITS Uraninite from the Olympic Dam IOCG-U-Ag deposit: Linking...main U-minerals: uraninite, coffinite, and brannerite. Four main classes of uraninite have been identified...identified. Uraninite occurring as single grains is characterized by high-Pb and SREE+Y (SREY) but based on...typically present in the same sample. Primary uraninite (Class 1) is smallest (10–50 mm), displays a cubic-euhedral...both oscillatory and sectorial zoning. “Zoned” uraninite (Class 2) is coarser, sub-euhedral, and combines |  | | Journal (article/letter/editorial) | | deposits and thereby determine long-term rates 1 Department of Geology, FCFM, Universidad de Chile Plaza...(Cu2O). (B) Supergene alteration products of black uraninite (UO2) sample from Congo: lemon yellow schoepite...deposits occur in Australia. In the Hamersley province of Western Australia, there are channel iron deposits...famous ~2 billion-year-old Oklo uranium deposit (Gabon), considered a natural fission reactor, have provided...KA, Ewing RC (2005) Uraninite recrystallization and Pb loss in the Oklo and Bangombé natural fission reactors |  | | Report (issue) | | deposits of Mas Laveyre (France) and Mikouloungou (Gabon). 5 3. Hematite breccia complex deposits: Deposits...mineralisation can be up to 1.5 km. Ores are uraninite-brannerite by composition and belong to ordinary...concentrated as primary uranium ore, generally uraninite, in the permeable breccia matrix, and in the arcuate...Limestone in the Grants district (USA) where uraninite occurs in intraformational folds and fractures...massive pods, veins and/or disseminations of uraninite spatially associated with major unconformities |  | | Journal (article/letter/editorial) | | Australia, contains three dominant U minerals: uraninite; coffinite; and brannerite. Microanalytical and...always found with uraninite, and includes collomorph coffinite enveloped by massive uraninite, as well as aureoles...aureoles of coffinite on the margins of uraninite crystals. Coffinite-C is associated with brannerite...and/or reprecipitation of earlier precipitated uraninite, or could represent the products of a later U...(2) coffinite is commonly found on the edges of uraninite, implying later deposition; and (3) coffinite |  | Škácha, P., Goliáš, V., Sejkora, J., Plášil, J., Strnad, L., Škoda, R., Ježek, J. (2009) Hydrothermal uranium-base metal mineralization of the Jánská vein, Březové Hory, Příbram, Czech Republic: lead isotopes and chemical dating of uraninite. Journal of GEOsciences, 54 (1) 1-13 | Journal (article/letter/editorial) | | Republic: lead isotopes and chemical dating of uraninite Pavel Škácha1*, Viktor Goliáš1, Jiří Sejkora2...43 Prague 2, Czech Republic; skachap@volny.cz Department of Mineralogy and Petrology, National Museum...macroscopic and microscopic study. Most specimens of uraninite, obtained from archive, contain more or less abundant...Pb in uraninite fluctuates from 48 up to 89.8 %. The age of theoretical end member of uraninite, calculated...208Pb/206Pb = 0), is 269.8 ± 20.3 Ma (2σ). The only uraninite grain without galena inclusions yielded an age |  | | Book | | spark; and George Dials, nuclear engineer and Department of Energy—Carlsbad Office manager, who cleared...geologic disposal of anthropogenic nuclear waste Department of Geography, David J. Mossman* Mount Allison...New South Wales 2006, Australia Ralf Briining Department of Physics, Mount Allison University, 67 York...uranium and fissiogenic isotopes are held in uraninite, which became enclosed in liquid bitumen during...geologic disposal sites. Indications are that at Oklo, Gabon, carbonaceous substances have combined to restrain |
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