 | 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...Well-preserved outcrops may be found in quarries (i.e. Oklo, Mikouloungou and Socoba) and along roads and railways’...in Oklo quarry and sand injectites at M’vengue underlined the former structuration, while quartz veins...extensional episodes (i.e. quartz veins and stylolites) close to synsedimentary faults at Oklo and Mikouloungou |  | 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) | | Kenji Horie a , Françoise Gauthier-Lafaye c a Department of Earth and Planetary Systems Science, Hiroshima...included in sandstone near the Oklo uranium deposit, Republic of Gabon, show extremely low 207Pb/206Pb...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... Keywords: radium; adsorption; illite; calcite; Oklo natural reactor; Pb isotopes 1. Introduction Radium |  | | Journal (article/letter/editorial) | | EOA3CO,Canada 21aboratory of Organic Geochemistry, Department of Geosciences, The University of Arizona, Tucson...kerogen and solid bitumen as it is in many of the Oklo uranium deposits and in the Witwatersrand gold-uranium...to the 3 Ga old Witwatersrand and the 2.1 Ga old Oklo ore deposits. They have been regionally metamorphosed...uranium ores and natural fission reactors of Oklo, Republic of Gabon. Twenty-five maximum and minimum reflectance...some of the organic matter in the vicinity of the Oklo natural fission reactors ( NAGY et al., 199 1). |  | | Journal (article/letter/editorial) | | Ma ago. The model explaining the formation of the Oklo uranium deposits suggests that at the time of sediment...Paleoproterozoic; Uranium; Manganese; Atmosphere; Oklo; Gabon; Carbon isotopes; Black shales 1. Introduction...Introduction The natural nuclear fission reactors in Gabon are unique. The possibility that nuclear fission reactions...occur 2.0 Ga ago in the Oklo uranium deposit of the Francevillian Series, Gabon (Neuilly et al., 1972)...in the Paleoproterozoic uranium ore deposits of Gabon. This observation raises the question whether this |  | | Journal (article/letter/editorial) | | uraninite in the natural fission reactors in Gabon J. ‘Department JANECZEK’ and R. C. EWING’ ‘Faculty of...uranium ore from the natural fission reactors in Gabon were studied by detailed electron microprobe analysis...Ru. INTRODUCTION it has also been recognized at Oklo (Havette et al., 1975; Lancelot et al., 1975; Devillers...loss from uraninite, the U-P\, ages of U ore at Oklo range from 1780 Ma to 2050 Ma (Naudet, 1991). A...1993b). The major episode of Pb mobilization at Oklo has been related to the intrusion of a dolerite |  | Préat, Alain, Bouton, Pascal, Thiéblemont, Denis, Prian, Jean-Pierre, Ndounze, Serge Simo, Delpomdor, Franck (2011) Paleoproterozoic high δ13C dolomites from the Lastoursville and Franceville basins (SE Gabon): Stratigraphic and synsedimentary subsidence implications. Precambrian Research, 189 (1) 212-228 doi:10.1016/j.precamres.2011.05.013 | Journal (article/letter/editorial) | | from the Lastoursville and Franceville basins (SE Gabon): Stratigraphic and synsedimentary subsidence implications...Serge Simo Ndounze d , Franck Delpomdor a a Department of Earth Science and Environmental Sciences,...des Mines et de la Géologie, BP 284 Libreville, Gabon b a r t i c l e i n f o Article history: Received...Stable isotopes Paleoproterozoic Francevillian Group Gabon a b s t r a c t New data for the isotopic composition...shallow-marine sedimentary carbonates in southeastern Gabon (Franceville and Lastoursville sub-basins) indicate |  | Mathieu, Régis, Zetterström, Lena, Cuney, Michel, Gauthier-Lafaye, François, Hidaka, Hiroshi (2001) Alteration of monazite and zircon and lead migration as geochemical tracers of fluid paleocirculations around the Oklo–Okélobondo and Bangombé natural nuclear reaction zones (Franceville basin, Gabon) Chemical Geology, 171 (3) 147-171 doi:10.1016/s0009-2541(00)00245-x | Journal (article/letter/editorial) | | around the Oklo–Okelobondo and Bangombe´ natural nuclear reaction zones ´ žFranceville basin, Gabon/ Regis...rue Blessig, Strasbourg Cedex F-67084, France ´ Department of Earth and Planetary Systems, Faculty of Science...sandstones of the Franceville basin ŽGabon. hosting Oklo natural nuclear reaction zones ŽRZ. in relation...Zircon; Alteration; Diagenesis; Migration; Lead; Oklo; Franceville 1. Introduction Spontaneous natural...three U deposits of the Franceville basin, Gabon, namely Oklo, Okelobondo and Bangombe´ ŽFig. 1.. ´ Natural |  | 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) | | beneath a natural fission reactor at Bangombé, Gabon HIROSHI HIDAKA,1,2,* JANUSZ JANECZEK,3 FRANCES N...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...beneath a natural fission reactor at Bangombé, Gabon. Phosphate minerals such as phosphatian coffinite |  | | Journal (article/letter/editorial) | | Paleoproterozoic natural nuclear fission reactors of Oklo, Gabon: paragenesis, thermal maturation and carbon isotopic...François Gauthier-Lafaye b, Simon E. Jackson c,1 a Department of Physics, Engineering and Geoscience, Mount...France c Centre for Earth Resources Research, Department of Earth Sciences, St. John’s, Newfoundland,...uranium ores and fossil nuclear fission reactors of Oklo. The categories include kerogens of the Mikouloungou...late dolerite dikes. Bitumen migration occurred at Oklo during at least three intervals: (1) ca. 2.0 Ga |  | Loss, R.D., Rosman, K.J.R., De Laeter, J.R., Curtis, D.B., Benjamin, T.M., Gancarz, A.J., Maeck, W.J., Delmore, J.E. (1989) Fission-product retentivity in peripheral rocks at the Oklo natural fission reactors, Gabon. Chemical Geology, 76 (1) 71-84 doi:10.1016/0009-2541(89)90128-9 | Journal (article/letter/editorial) | | retentivity in peripheral rocks at the Oklo natural fission reactors, Gabon R.D. LOSS 1'.1, K.J.R. ROSMAN 1...retentivity in peripheral rocks at the Oklo natural fission reactors, Gabon. Chem. Geol., 76: 71-84. Thermal...the immediate vicinity of Reactor Zone 9 at the Oklo mine site. The mass spectrometric isotope dilution...occurring fission reactors found at the Oklo uranium mine in Gabon, Southwest Africa (De Laeter, 1985)....Ruffenach et al., 1980). 1.1. Setting The Oklo uranium mine is located in the Francevillian Basin in the |  | | Journal (article/letter/editorial) | | radiolysis on local redox conditions in the Oklo, Gabon, natural fission reactors 10 and 16 CREGU VI~RONIQIJE...significantly modify the local redox conditions. The Oklo natural fission zones are good examples where the...of the alteration zone, barite partly replaces quartz. In the reactor zone, hematite is sometimes replaced...observed in healed microcracks in the detrital quartz grains. Based on microthermometric measurements...claimed that, in the conditions of the operating Oklo reactors, there had been the same recombination |  | | Journal (article/letter/editorial) | | os de Caldas, Cigar Lake, Maqarin, El Berrocal, Oklo and Palmottu. To make this comparison meaningful...by a quartz vein with associated primary uranium mineralisations (Enresa, 1996); Oklo (Gabon), a fossil...carried out to date. For example, the studies at Oklo and Palmottu were completed only during 1999. Consequently...BPM exercises, from the Pocß os de Caldas to the Oklo and Palmottu projects, has not varied significantly...(Spain), CSIC (Spain) and MBT/QuantiSci (Spain). Oklo: CEA (France), Ciemat (Spain), CNRS (France), CSIC |  | | Journal (article/letter/editorial) | | reactors in Oklo were operating (Adam, 2007; Fig. 3). 3.2. Proterozoic natural nuclear reactor in Oklo, Gabon...uranium deposits of the Francevillian series in Gabon (Bodu et al., 1972; Neuilly et al., 1972). Since...reactor zones (RZs) have been found in the Oklo in Gabon, several of which are characterized in Table...within Okelobondo and Bangombe deposits close to Oklo (Hidaka and Kikuchi, 2010). The RZs consist of high-grade...2016). Summarizing the formation history of the Oklo natural reactors, detrital U-bearing minerals were |  | 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) | | associated with the Palaeoproterozoic Oklo natural fission reactors, Gabon A. Dutkiewicz a,⁎, S.C. George b...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...sandstone of the Franceville Basin in Gabon that hosts the Oklo natural fission reactors has been discovered...syntaxial quartz overgrowths and intragranular and transgranular microfractures in detrital quartz. Homogeneous |  | | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY PRELIMINARY RESULTS FROM MICRQANALYSES OF...MATTER IN THE LOWER PROTEROZOIC URANIUM ORES AT OKLO IN GABON By Joel S. Leventhal , Bartholomew Nagy2 ,...CO 80225 p Laboratory of Organic Geochemistry, Department of Geosciences, The University of Arizona Tucson...column and interpretation of the Cl layer at the Oklo deposit. (After Gauthier-Lafaye and Weber, 1989).............. Figure 5a. Laser Raman spectra from Oklo sample KP 3...................... Figure 5b. Laser |  | | Journal (article/letter/editorial) | | in micro-minerals bearing fission products in the Oklo and Bangombé natural reactors: A review of a natural...migration of fission products H. Hidaka ∗ , M. Kikuchi Department of Earth and Planetary Systems Science, Hiroshima...Natural reactor Gabon Migration a b s t r a c t In the Precambrian, parts of the Oklo, Okélobondo and...Republic of Gabon, central Africa, functioned as natural fission reactors. Many elements in the Oklo and Bangombé...analyses on micro-minerals found in and around the Oklo and Bangombé natural reactors are reviewed in this |  | | Book | | spark; and George Dials, nuclear engineer and Department of Energy—Carlsbad Office manager, who cleared... Pe Pee ee Vii 1. Carbonaceous substances in Oklo reactors—Analogue for permanent deep geologic disposal...31 Geological characterization of the Asse salt mine for mining, disposal of radioactive waste, ANI ...the German Konrad repository in a former iron ore mine for radioactive waste generating no to negligible...Engineering Geology XIX 2008 Carbonaceous substances in Oklo reactors—Analogue for permanent deep geologic disposal |  | | Journal (article/letter/editorial) | | recrystallization and Pb loss in the Oklo and Bangombé natural fission reactors, Gabon LENA Z. EVINS,1,* KELD A....Museum of Natural History, Stockholm, Sweden Department of Geological Sciences, University of Michigan...accepted in revised form July 19, 2004) Abstract—The Oklo and Bangombé natural fossil fission reactors formed...formed ca. 2 Ga ago in the Franceville basin, Gabon. The response of uraninite in the natural reactors...Uraninite and galena from two reactor zones, RZ16 at Oklo and RZB at Bangombé, were studied to clarify the |  | | Journal (article/letter/editorial) | | 155–174 Hydrothermal and supergene clays of the Oklo natural reactors: conditions of radionuclide release...surrounding two natural fission reactors of the Oklo deposit. In the deeply preserved reactor 10 Ž450...Elsevier Science B.V. All rights reserved. Keywords: Oklo; Nuclear waste; Clays; Weathering; O-isotopes; Fission...fission reactors located in the uranium deposits of Gabon constitute an unique opportunity to study the long...have been recognised in the Oklo open pit and in the deeper Oklo–Okelobondo mine Ž200–600 m deep.. In the |  | | Report (chapter) | | 2015 Special cases of natural analogues: The Gabon and Cigar Lake U ore deposits F. G A U T H I E R... Tokai-mura, Ibaraki-ken, Japan Abstract: The Gabon and Cigar Lake uranium deposits may be used as natural...clay matrix. Futhermore, the Oklo and Bangomb6 uranium deposits in Gabon were natural nuclear fission...explain the preservation of the natural reactors of Gabon and of the Cigar Lake deposit. The mineralogy of...Cigar Lake deposit and in the natural reactors of Gabon. Coffinitization may be related to hydrothermal |  | | Journal (article/letter/editorial) | | TcrRu fractionation in the Oklo and Bangombe´ natural fission reactors, Gabon Hiroshi Hidaka a a,b,) ...Philippe Holliger c , François Gauthier-Lafaye b Department of Earth and Planetary Systems Science, Hiroshima...rue Blessig, 67084 Strasbourg Cedex, France ´ c Department of Optronics, Commissariat a` l’Energie Atomique...selected from four kinds of natural fission reactors at Oklo and Bangombe´ uranium deposits were determined by...Introduction The Oklo uranium deposit in the Francevillian sedimentary series, southeastern Gabon, has retained |  | | Journal (article/letter/editorial) | | 1989, pp• 2286-2295 Natural Fission Reactors of Oklo F. GAUTHIER-LAFAYE, F. WEBER, Centrede Sddimentologie...famous and the first discovered are those in the Oklo uranium ore deposit.Petrographic,geochemical,and...fissionreactionsat Oklo is characterizedby a gangueof clay minerals,whereasthe normalore of Oklo consistsof sandstones...stabledaughterisotopes. The nuclear phenomenonat Oklo is unique URANIUMwith an abnormalisotopiccomposition...sionproductsstoredin a geologicenvironmentfor a deposit (Gabon) in 1972 by the Commissariat?t geologicallysignificantperiod |  | | Journal (article/letter/editorial) | | phases and bitumen in the Oklo Proterozoic natural fission reactors, Gabon JOHN PARNELL School of Geosciences...the Proterozoic natural fission reactors at Oklo, Gabon contain abundant organic matter (bitumen), with...bitumen, uranium, Oklo, Gabon. Introduction TllE uranium ore deposits at Oklo, Gabon, are unique in including...the migration and retention of elements about the Oklo reactors. Work on fissiogenic isotopes shows that....... i :ili~Libreville 0~ F GABON -::I" - 1 ,:.."" N 5~3 4 Oklo ;\ 2" "2-.... " 9 "2:.... |  | | Journal (article/letter/editorial) | | Review A Review of In Situ Isotopic Studies of the Oklo and Bangombé Natural Fission Reactors Using Microbeam...Microbeam Analytical Techniques Hiroshi Hidaka Department of Earth and Planetary Sciences, Nagoya University...fission products, have been found in and around the Oklo and the Bangombé natural reactors. In the past two...compositions of various elements in and around the Oklo and Bangombé natural reactors vary significantly...like to review the isotopic results related to the Oklo and Bangombé reactors mainly based on my works using |
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