 | Ndongo, Alexis, Guiraud, Michel, Vennin, Emmanuelle, Mbina, Michel, Buoncristiani, Jean-François, Thomazo, Christophe, Flotté, Nicolas (2016) Control of fluid-pressure on early deformation structures in the Paleoproterozoic extensional Franceville Basin (SE Gabon) Precambrian Research, 277. 1-25 doi:10.1016/j.precamres.2016.02.003 | Journal (article/letter/editorial) | | Paleoproterozoic extensional Franceville Basin (SE Gabon) Alexis Ndongo a , Michel Guiraud a,∗ , Emmanuelle...et Techniques de Masuku, B.P. 943, Franceville, Gabon c AREVA Mining Business Group Tour AREVA, 1 place...M’vengue underlined the former structuration, while quartz veins and stylolites observed in Socoba quarry...during postlithification extensional episodes (i.e. quartz veins and stylolites) close to synsedimentary faults...Outline of the geology of Gabon The emplacement of various geological domains of Gabon is associated with the |  | 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...110 cm beneath a natural fission reactor at Bangombé, Gabon. Phosphate minerals such as phosphatian coffinite |  | 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...coffinite, uraninite, natural fission reactor, Bangombé introDuCtion Janeczek and Ewing (1996) first |  | Bankole, Olabode M., El Albani, Abderrazak, Meunier, Alain, Gauthier-Lafaye, François (2015) Textural and paleo-fluid flow control on diagenesis in the Paleoproterozoic Franceville Basin, South Eastern, Gabon. Precambrian Research, 268. 115-134 doi:10.1016/j.precamres.2015.07.008 | Journal (article/letter/editorial) | | Paleoproterozoic Franceville Basin, South Eastern, Gabon Olabode M. Bankole a,∗ , Abderrazak El Albani a...Basin Gabon a b s t r a c t The Paleoproterozoic (∼2.15 Ga) Franceville Basin, South Eastern Gabon, is...fluvio-deltaic quartz arenite in upper part of FA Formation is characterized by pervasive authigenic quartz cementation...arkosic to sub-arkosic sandstones that escaped early quartz cementation show considerable pressure solution...Franceville Basin (Fig. 1), located in south-eastern Gabon, represents one of the world oldest petroleum systems |  | | 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 |  | 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) | | 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 |  | | Journal (article/letter/editorial) | | recrystallization and Pb loss in the Oklo and Bangombé natural fission reactors, Gabon LENA Z. EVINS,1,* KELD A. JENSEN...Museum of Natural History, Stockholm, Sweden Department of Geological Sciences, University of Michigan...and Bangombé natural fossil fission reactors formed ca. 2 Ga ago in the Franceville basin, Gabon. The...from two reactor zones, RZ16 at Oklo and RZB at Bangombé, were studied to clarify the chronology and effect...loss from uraninite occurred at both Oklo and Bangombé during regional extension and the intrusion of |  | 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) | | 5 kbar and 350 °C), well-shaped Dauphiné habit quartz crystals coexist with albite, abundant clinochlore...Paralana Hot Springs (Brugger et al. 2005). The province contains many small Paleozoic hematite-U-CuNb-REE...large epithermal system characterized by complex quartz±fluorite veins and breccias (Coats and Blissett...consisting of quartz veins with abundant pseudomorphs after fluorite and “needle quartz” growing around...occur mainly in the cavities of the epithermal quartz, and in cavities resulting from the dissolution |  | 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) | | at the Oklo-Okélobondo natural fission reactors, Gabon MOSTAFA FAYEK,1,3,* SATOSHI UTSUNOMIYA,2 RODNEY...studying the evolution of the Oklo-Okélobondo and Bangombé U deposits. However, the post-criticality evolution...FRANCEVILLIAN URANIUM DEPOSITS, GABON, AFRICA The Oklo-Okélobondo and Bangombé U deposits are located in the...Franceville sedimentary basin in South Eastern Gabon (e.g., see Fig. 1 in Gauthier-Lafaye and Weber 1989;...reproducible to ± 0.1‰, and the d18O value of NIST-28 quartz is 9.6‰. The O yield for the UO2 crystal was 3 |  | | 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...composition of coffinite is from the U-deposits in Oklo, Gabon (e.g., Janeczek, 1999; Jensen and Ewing, 2001; Bros...has been reported in the natural reactor in Bangombé, Gabon, suggesting that coffinite may play an important...the groundwater is controlled by Al-silicates, quartz and chalcedony. Janeczek and Ewing (1992a) and |  | | 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, |  | | 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...Although the Pb isotopic ratios of calcite and quartz coexisting with illite indicate the formation age...contrast with low contents of Ba in calcite and quartz (b 0.26 ppm). Considering the chemical similarity...interest to understand the ⁎ Corresponding author. Department of Earth and Planetary Systems Science, Hiroshima |  | Ossa Ossa, Frantz, Hofmann, Axel, Vidal, Olivier, Kramers, Jan D., Agangi, Andrea, Belyanin, Georgy A., Mayaga-Mikolo, Francis (2014) Hydrothermal clay mineral formation in the uraniferous Paleoproterozoic FA Formation, Francevillian basin, Gabon. Precambrian Research, 246. 134-149 doi:10.1016/j.precamres.2014.03.003 | Journal (article/letter/editorial) | | Paleoproterozoic FA Formation, Francevillian basin, Gabon Frantz Ossa Ossa a,∗ , Axel Hofmann a , Olivier...Georgy A. Belyanin a , Francis Mayaga-Mikolo c a Department of Geology, University of Johannesburg, Auckland...Ministère de l’Industrie et des Mines, Libreville, Gabon b a r t i c l e i n f o Article history: Received...Formation of the Francevillian basin, south-east Gabon, which hosts high-grade U ore deposits associated...succession (Cortial ∗ Corresponding author at: Department of Geology, University of Johannesburg, APK Campus-C1 |  | 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) | | Czech Republic, 182 09 Prague, Czech Republic Department of Mineralogy and Petrology, National Museum...The mineralization showed vertical zoning with quartz–calcite–coffinite recognised ningyoite. Economic...The mineralization showed vertical zoning with quartz–calcite–coffinite mineralization in the upper parts...stockwork bodies, and was located whichcomplex consists quartz-carbonate of 30 30 individual individual veins...the mined ore mainly in the N–S striking complex quartz-carbonate veins up to 25 cm thick [33]. One-third |  | | Journal (article/letter/editorial) | | University, New York (schlosser@ldeo.columbia.edu) 2 Department of Earth and Env. Engineering, Columbia Univ...(frank@erdw.ethz.ch) 2 University of Oxford, Department of Earth Sciences, Oxford OX1 3PR, U.K. 3 Laboratory...Uppsala, Sweden (goran.possnert@material.uu.se) 2 Department of Earth Sciences, Uppsala University, 752 36...ALDAHAN1, G. POSSNERT2, M. MEILI3 AND V. ALFIMOV2 1 Department of Earth Sciences, Uppsala University, 752 36...Palisades, NY 10964 (jcole@ldeo.columbia.edu) 2 Department of Geosciences, State University of New York |  | | 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...1989). During a mineralogical study of sandstones (quartz arenites) underlying a natural fission reactor |  | | Journal (article/letter/editorial) | | deposit of the Shuikoushan mineral district, Hunan Province, China— Nanshi Zeng, E. Izawa, Y. Motomura, and...and titaniferous magnetiteilmenite-orthopyroxene-quartz oxygen barometry in granulite facies gneisses,...Evidence for a Cambrian diamondiferous alkaline province in northeastern North America—Stéphane Digonnet...around natural fission reactors at Oklo and Bangombé, Gabon —Hiroshi Hidaka and François Gauthier-Lafaye...orientation on the cathodoluminescence colors of quartz—Olav Walderhaug and Johannes Rykkje 545 Depositional |  | | 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...geologic disposal sites. Indications are that at Oklo, Gabon, carbonaceous substances have combined to restrain...INTRODUCTION The Proterozoic Franceville Series of Gabon consists of a 1— 4-km-thick succession of mainly |  | Dutkiewicz, A., George, S.C., Mossman, D.J., Ridley, J., Volk, H. (2007) Oil and its biomarkers associated with the Palaeoproterozoic Oklo natural fission reactors, Gabon. Chemical Geology, 244 (1) 130-154 doi:10.1016/j.chemgeo.2007.06.010 | Journal (article/letter/editorial) | | Palaeoproterozoic Oklo natural fission reactors, Gabon A. Dutkiewicz a,⁎, S.C. George b , D.J. Mossman...Australia Australian Centre for Astrobiology, Department of Earth and Planetary Sciences, Macquarie University...Australia c Department of Geography, Mount Allison University, Sackville, NB, Canada E4L A7 d Department of Geosciences...Formation sandstone of the Franceville Basin in Gabon that hosts the Oklo natural fission reactors has...syntaxial quartz overgrowths and intragranular and transgranular microfractures in detrital quartz. Homogeneous |  | | Journal (article/letter/editorial) | | Oklo–Okélobondo and Bangombé natural nuclear reaction zones (Franceville basin, Gabon)—Régis Mathieu, Lena...at the Zenith deposit, Southwestern Grenville Province, Renfrew area, Ontario, Canada—S. Salvi 77 CONTRIBUTIONS...precious-metal ores in the western Mediterranean province (Cévennes, France - Sardinia, Italy)— P. Béziat...R. Oyarzun B121 Agua Rica prospect, Catamarca province, Argentina: An example of deposit evaluation based...and preliminary interpretations of the Jilau gold-quartz vein deposit, Tajikstan— A. Cole, J.J. Wilkinson |  | 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...minerals within the ODBC are hematite (±magnetite), quartz, sericite, orthoclase, chlorite, barite, fluorite...metal-rich (Cu-Pb-Zn) minerals → sulfide-barren hematite-quartz-barite breccia in the deposit centre. Spatially...remnants of advanced argillic alteration (sericite + quartz ± Al-OH) are also present in the deposit (Ehrig...major ore and gangue minerals, e.g., hematite, quartz, sericite, orthoclase, chlorite, fluorite, siderite |  | | 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...particular relevance to nuclear waste management is in Gabon, where at least 15 natural fission reactors have...and the presence of neutron reflectors, such as quartz, in the surrounding sandstone enabled the nuclear...were created around each reactor zone, in which quartz was replaced by clay, the argile de pile (Jensen |  | | Report (issue) | | production in Olympic Dam deposit............... 37 Quartz-pebble conglomerate deposits ....................deposits of Mas Laveyre (France) and Mikouloungou (Gabon). 5 3. Hematite breccia complex deposits: Deposits...consist mainly of gangue material (e.g. carbonates, quartz) and ore material, mainly pitchblende. Typical...molybdenum, other sulphides, violet fluorine and quartz. Most significant commercial deposits are located...Sandstone–Tectonic/Lithologic • Hematite Breccia Complex • Quartz-pebble Conglomerate • Vein • Intrusive • Volcanic |  | | 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...(containing several wt% Th) in the Witwatersrand-type quartz-pebble conglomerates deposited in a highly anoxic...and the unique Oklo natural nuclear reactors in Gabon. The onset of hydrothermal transport of (UO2)2+...detrital Th-bearing uraninite in Witwatersrand-type quartz-pebble conglomerates deposited in an anoxic surface |
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