 | 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...Franceville Basin (Fig. 1), located in south-eastern Gabon, represents one of the world oldest petroleum systems...2010, 2014) and natural nuclear fission reactors at Oklo, and widely explored for uranium and manganese ore...Regional geological map of Franceville Basin in Gabon (Ossa et al., 2013) that shows location of the study |  | | 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) | | 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...Pb-bearing calcite. In the surrounding sandstones, hematite is widespread. In zone 16, the mineral paragenesis...barite partly replaces quartz. In the reactor zone, hematite is sometimes replaced by pyrite. In an area where...radiolytic products, oxidizing conditions prevailed and hematite and minium have formed. Consequently, presence |  | | 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 |  | | Report (issue) | | .......................................... 30 Hematite Breccia Complex deposits........................Mikouloungou (Gabon). 5 3. Hematite breccia complex deposits: Deposits of this group occur in hematite-rich...activities include drilling and coring to complete final mine plans and establish final processing flowsheets...case of an underground mine or overburden stripping in the case of an open pit mine, mill construction,...Sandstone–Basal Channel • Sandstone–Tectonic/Lithologic • Hematite Breccia Complex • Quartz-pebble Conglomerate |  | 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 |  | | Journal (article/letter/editorial) | | DouglasG. Brookins 1936-1991 Wor-rc.q.NcE. Ersrox Department of Geology, University of New Mexico, Albuquerque...contributions to university affairs included service as a department chairman (1976-1979), a faculty senator for three...authority on methods to contain radioactive wastes from mine dumps and reactors. From studies of the dispersal... he derived predictions as to their behavior in mine dumps and other disposal sites, including the Waste...This approach led him to a study of the Oklo phenomenon in Gabon, central Africa, where a natural uranium |  | | Journal (article/letter/editorial) | | os de Caldas, Cigar Lake, Maqarin, El Berrocal, Oklo and Palmottu. To make this comparison meaningful...primary uranium mineralisations (Enresa, 1996); Oklo (Gabon), a fossil natural nuclear reactor systems located...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 |  | 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 |  | Stille, P., Gauthier-Lafaye, F., Jensen, K.A., Salah, S., Bracke, G., Ewing, R.C., Louvat, D., Million, D. (2003) REE mobility in groundwater proximate to the natural fission reactor at Bangombé (Gabon) Chemical Geology, 198 (3) 289-304 doi:10.1016/s0009-2541(03)00035-4 | Journal (article/letter/editorial) | | proximate to the natural fission reactor at Bangombé (Gabon) P. Stille a,*, F. Gauthier-Lafaye a, K.A. Jensen...Michigan, Ann Arbor, MI 48109-2104, USA c Asse Research Mine, Long Term Safety Assessment, D-38319 Remlingen...from only two uranium ore deposits of the world at Oklo 0009-2541/03/$ - see front matter D 2003 Elsevier...Chemical Geology 198 (2003) 289–304 and Bangombé in Gabon (Africa). These deposits are located in the Francevillian...rocks adjacent to the natural fission reactor 10 at Oklo revealed enrichments of 235U of up to 0.0105 that |  | | Journal (article/letter/editorial) | | SASKATCHEWAN, CANADA P. ALEXANDRE† AND T. K. KYSER Department of Geological Sciences and Geological Engineering...elsewhere (e.g., the “natural fission reactors” at Oklo, Gabon: Mossman et al., 1993a; in uranium occurrences...Cree Lake mobile zone, situated between the Rae province and the Trans-Hudson orogen (Lewry and Sibbald...Athabasca Group. Early diagenesis was characterized by hematite staining and quartz overgrowths (Fig. 3A), followed...(QO) separated from detrital quartz (QD) by a hematite rim (H). B. Fine- and coarse-grained kaolinite |  | | 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 |  | 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) | | hosted in a lithologically and texturally diverse, hematite-rich breccia complex developed within a granite...granite of the 1.59 Ga Gawler Silicic Province. Emerging evidence indicates that both the breccia complex...and Weber, 2003), of the type discovered at the Oklo uranium deposit (e.g., Naudet, 1974; Gauthier-Lafaye...(2012). The ODBC contains weakly to intensely hematite±sericite-altered clasts of host granite, bedded...Gawler Range Volcanics (GRV) in a fine-grained 7 hematite-rich matrix. Figure 1 is a schematic geological |  | Shukolyukov, Yuri A, Jessberger, Elmar K, Meshik, Alexander P, Vu Minh, Dang, Jordan, Jimmy L (1994) Chemically fractionated fission-xenon in meteorites and on the earth. Geochimica et Cosmochimica Acta, 58 (14) 3075-3092 doi:10.1016/0016-7037(94)90180-5 | Journal (article/letter/editorial) | | material processed in a natural nuclear reactor (Oklo phenomenon). Excess of these isotopes had also been...and after selective dissolving of rocks from the Oklo natural reactor was determined. The results of these...I; MARTY, 1989), especially in samples from the Oklo uranium deposit (SHUKOLYUKOV, 1982). A genetic link...Extraction (a) For the xenon analyses in samples from Oklo uranium ores at the Institute of Geochemistry and...in then Leningrad, xenon analyses in samples from Oklo uranium ores were done with a system with higher |  | | 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) | | 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...(Australia and Canada) and the unique Oklo natural nuclear reactors in Gabon. The onset of hydrothermal transport...abundances [e.g., ~3 metric tons (mT) of Pu at the Oklo natural reactors, 5 mT of Pu from atmospheric testing...(Australia and Canada) and the unique Oklo natural nuclear reactors in Gabon. During this phase, most uranyl |  | | Journal (article/letter/editorial) | | Natural fission reactors in the Franceville basin, Gabon: A review of the conditions and results of a "critical...deposits in the world, the Oklo and Bangomb6 deposits of the Franceville basin: Gabon. Since 1982, five new...over a long period of time. Therefore, the sites of Oklo and Bangomb6 are well preserved. For the reactors...program was initiated as a European Community project "Oklo: Natural analogue." These studies attempted to reconstruct...Franceville basin, Gabon, namely Oklo and Bangomb6. During the seventies, the Oklo natural fission reactors |  | | Journal (article/letter/editorial) | | NoirsLimoazat, Forez, France Margnac and Fanay, France Oklo, Gabon, Africa ChateauLambert, S.Vosges, France Ceara...Canning, Owl Creek Mountains, Wyoming, USA Ukraine Oklo, Gabon, Africa Northern Arizona, USA Mary Kathleen,...Colorado, USA Cottonwood Wash, Utah, USA Oklo, Gabon, Africa Oklo, Gabon, Africa Rabbit Lake, Saskatchewan,...Australia Akouta, Nigeria, Africa Lodeve, France Oklo, Gabon, Africa Coronation Hill, Australia Capitan Mountains...[42] Bernardan, France U 54–360 – – [43] Oklo, Gabon, Africa U 160–468 – 0.2–17.8 [44] Marysvale |  | 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 mAtthew...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... from the natural nuclear reactor at Bangombé, Gabon (depth 12.25 m), has been examined as an important...P-coffinite-(i) 7 beige to brown altered clay with hematite uraninite 100µm 8 clay, red Fe-oxides quartz |  | | Journal (article/letter/editorial) | | LOWER PROTEROZOIC SEDIMENTS: THE FRANCEVILLIAN IN GABON M.G. BONHOMME, F. GAUTHIER-LAFAYE and F. WEBER...Lower Proterozoic sediments: the Francevillian in Gabon. Precambrian Res., 18: 87--102. New mineralogical...the upper part o ~ t h e Ogoo~ River basin in the Gabon Republic. The discovery, in 1972, of natural nuclear...nuclear reactors in the uranium ore deposit at Oklo (Bodu et al., 1972; Neuilly et al., 1972) increased...dating technique using fission products f o u n d at Oklo. These methods reveal an age of ca. 2000 Ma (DeviUers |  | Sangély, L., Chaussidon, M., Michels, R., Brouand, M., Cuney, M., Huault, V., Landais, P. (2007) Micrometer scale carbon isotopic study of bitumen associated with Athabasca uranium deposits: Constraints on the genetic relationship with petroleum source-rocks and the abiogenic origin hypothesis. Earth and Planetary Science Letters, 258 (3) 378-396 doi:10.1016/j.epsl.2007.03.018 | Journal (article/letter/editorial) | | been unequivocally established (samples from Oklo, Gabon, and Lodève, France, uranium deposits); (iii)...with the Paleoproterozoic uranium deposits of Oklo (Gabon) could be established on the basis of obvious...microspectroscopy on bitumen samples from the Athabasca (A), the Oklo and Lodève (B) uranium deposits. Numbers refer to...spatially independent uranium deposits of Oklo (Paleoproterozoic, Gabon) and Lodève (Permian, SE France). Both...Planetary Science Letters 258 (2007) 378–396 2.2. Oklo The Oklo uranium deposit is located in the Francevillian |  | | Report (volume) | | Editors: Peter C. Burns' & Robert Finch 2 1 Department of Civil Engineering and Geological Sciences...Environmental issues such as coping with uranium mine and mill tailings and other uranium-contaminated...and Geochemistry of Natural Fission Reactors in Gabon Janusz Janeczek 8 393 Geomicrobiology of Uranium...and Geochemistry of Natural Fission Reactors in Gabon Janusz Janeczek INTRODUCTION: NATURAL FISSION REACTORS...largest construction projects in the history of the Department of Energy. Approximately three billion dollars |  | Dubessy, Jean, Pagel, Maurice, Beny, Jean-Michel, Christensen, Hilbert, Hickel, Bernard, Kosztolanyi, Charles, Poty, Bernard (1988) Radiolysis evidenced by H2-O2 and H2-bearing fluid inclusions in three uranium deposits. Geochimica et Cosmochimica Acta, 52 (5) 1155-1167 doi:10.1016/0016-7037(88)90269-4 | Journal (article/letter/editorial) | | uranium deposits: Oklo (Gabon), Rabbit Lake and Cluff Lake D (Saskatchewan, Canada). In the Oklo uranium deposit...deposits are consistent with the first model. In the Oklo deposit, the H2-bearing fluid inclusions found in...(Saskatchewan, Canada) and to the Oklo uranium ore deposit (Gabon). Previous studies on Rabbit Lake (PAGEL...Cluff Lake D (PAGEL, 1975; PAGEL et al., 1980), and Oklo (OPENSHAWet al., 1978) have shown INTRODUCTION...from Oklo, Rabbit Lake, and CIuff Lake D uranium deposits are compared in Table 1. Oklo. The Oklo uranium |  | | 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;...been reported in the natural reactor in Bangombé, Gabon, suggesting that coffinite may play an important...vanuralite with coffinite in the altered “pitchblende” at Oklo, indicating a potentially important role of V during |  | | Journal (article/letter/editorial) | | Near-Surface Environments HEINRICH D. HOLLAND† Department of Earth and Planetary Sciences, Harvard University...have been: 3Fe2+ + 4H2O → Fe3O4 + 6H+ + H2. (1) Hematite is rare in the Isua BIF but not in some other...with seawater very low in H2 could have generated hematite via the overall reaction: 2Fe2+ + 3H2O → Fe3O3...under anoxic conditions. The precipitation of hematite and its hydrated precursors does not, therefore...oxygen-rich atmosphere. Hence the presence of hematite in places such as Marble Bar, Australia, cannot |
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