 | | Journal (article/letter/editorial) | | stromatolites in the 2000 Ma Franceville Group, Gabon J. Bertrand-Sarfati*,” and B. Potinb ‘Institut des...Palaeoproterozoic (2000 Ma) cover of the Chaillu craton in Gabon. They occur in two different areas, probably in...the other (B) comes from a drill-hole in the Nord Leyou domain (Fig. 1) . In both cases the beds consist...stromatolites outcrop along the road from Franceville to Moanda, close to the village of Djoutou (Fig. 2A). The...3=Francevillian SW. Franceville ,” /, 1’ I / Moanda Fig. 2. (A) Location of the outcrops (from COGEMA |  | 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...Outline of the geology of Gabon The emplacement of various geological domains of Gabon is associated with the...is represented by the Chaillu massif in southern Gabon and the Monts de Cristal in the north (Fig. 1)....two sub-domains: (Sub-domain 1) The metamorphic Ogooué block (Fig. 1) is characterized by compressive |  | 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 |  | | Journal (article/letter/editorial) | | 323--336 (1972) © by Springer-Verlag 1972 La province urani~re du bassin de Franceville (R6publique...sedimentary series of the Franceville Precambrian basin (Gabon Republic) consists of two successive sandstony-pelitic...1958 et F. WEBER 1969; Echelle: 1/5.000.000 La province uranif4re Les travanx de reconnaissance se poursuivent...de penser qu'elle d4passe 400 m au Nord-Ouest de Moanda, qu'elle atteint 500 m 325 et plus au centre du...COMUF); j. BouRae~ et J. P. PFIFFEL.~IANN:La province uranifhre Episode p41itique Flb Annonc& par tes |  | | Journal (article/letter/editorial) | | e r a i II est possible de distinguer de bas en haut des coupes 6tudi6es (coupes naturelles, puits d'hommes...poissons>> comparable ~ celle qui a 6t6 d6crite/t Moanda au Gabon (Perseil et Bouladon 1971; Nahon et al. 1983)...front d'alt6ration (Fig. 1). On y d6crit de bas en haut: - (i) une unit6 mangan6sif6re inf6rieure d'environ...phyllosilicates (15 g 25%), de feldspaths (0 fi 10%), de pyrite ( ~ 5%) et de mati6re charbonneuse. 1 Non fournies...6t6 d6jfi observ6 dans les gisements africains de Moanda et de Ziemougoula par Beauvais et Nahon (]!985) |  | Nahon, Daniel, Beauvais, Anicet, Boeglin, Jean-Loup, Ducloux, Jacques, Nziengui-Mapangou, Pacome (1983) Manganite formation in the first stage of the lateritic manganese ores in Africa. Chemical Geology, 40 (1) 25-42 doi:10.1016/0009-2541(83)90089-x | Journal (article/letter/editorial) | | 3COMILOG, Service Prospections Extdrieures, Moanda (Gabon) (Received June 23, 1982; revised and accepted...whereas in a weathered carbonate sequence (Moanda, Gabon) manganite replaces thodochrosite. In both areas...tephroitites. The second is the minefield of Moanda in Gabon where the weathering profile overlies Precambrian...CARBONATE ROCKS OF MOANDA (GABON) The l>recambrian parent-rock of the Moanda minefield is a black...up of illite, Mn-bearing carbonates, clusters of pyrite and some detrital silt-size quartz. This shale |  | | Journal (article/letter/editorial) | | weathering of sedimentary parent rocks at Moanda, in Gabon. Manganese concentration through chemical...ZlEMOUGOtJLA WHEATRERIRG PROFILE ~ gondile b _ THE MOANDA WHEATHERING PROFILE Fig. 1. Sketch of two weathering...Ziemougoula and (b) Mn2+-bearing sedimentary rocks at Moanda. 322 D. NAHON & S. PARC phides which weather...sulphides occuring at the same time and goanda area (Gabon) decreasing strongly the pH. At the same level of...Moanmanganiferous calcite transformations, is replaced by da in Gabon where the weathering profile, which is birnessite |  | | Journal (article/letter/editorial) | | EYLANDT, NORTHERN TERRITORY, AUSTRALIA BERNHARD Department PRACEJUS. of Geology and Geophysics, BARRIE...example, the highest grade ores at the giant Moanda deposit in Gabon include supergene manganite, pyrolusite...makes Groote Eylandt an analogue of the Moanda deposit in Gabon. The importance of supergene processes... 94 Moanda, Gabon According to Leclerc and Weber (1980) the superficial manganese ores of Moanda have...upgraded ore in other areas. Remobilization in Moanda produces topographically controlled (lower areas) |  | | Journal (article/letter/editorial) | | ACCOMPANYING PHASES IN A LATERITIC PROFILE OF MOANDA, GABON M. AMOURIC,I S. PARC,2 AND D. NAHON2 I...mixtures of manganite and pyrolusite from the Moanda sequence (Gabon) were examined by HRTEM in an effort to...manganiferous sedimentary rocks in the Moanda minefield, Gabon. A global cross section of this profile... 23% illite, 11% detrital silt-size quartz, 4% pyrite, and 6% organic matter (Parc et aI., 1989). In...manganite and pyrolusite occurred at the base of the Moanda sequence. The samples consisted of MANGANIFEROUS |  | 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) | | generation in the Paleoproterozoic Franceville Series, Gabon David J. Mossman a,∗ , François Gauthier-Lafaye...Gauthier-Lafaye b,1 , Simon E. Jackson c,2 a c Department of Geography, Mount Allison University, 144 Main St. Sackville...Formation of the Franceville Series, southeastern Gabon, contains one of the greatest accumulations of organic...Organic matter; Geochemistry; Paleoproterozoic; Gabon 1. Introduction The 2.1 Ga old black shales of...of the Franceville Series, Republic of Gabon (Fig. 1) rank as one of the major Precambrian accumulations |  | | Journal (article/letter/editorial) | | 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...Oklo uranium deposit of the Francevillian Series, Gabon (Neuilly et al., 1972). Other uranium deposits of...in the Paleoproterozoic uranium ore deposits of Gabon. This observation raises the question whether this...Mn-deposits in the world, namely the Moanda deposit. Reserves of the Moanda deposits are estimated to be 200 |  | | Report (issue) | | United States of America 1984 CIRCULAR 930-A Department of the Interior WILLIAM P. CLARK, Secretary...compiler), USGS; Ian Goldberg, South African Department of Mineral and Energy Affairs (MEA), Minerals...A. B. T. Werner and Jan Zwartendyk, Canadian Department of Energy, Mines and Resources (EMR), Mineral...of Mines and the Geological Survey of the U.S. Department of the Interior; the Geological Survey and the...the Mineral Policy Sector of the Canadian Department of Energy, Mines and Resources; the Federal Institute |  | | Journal (article/letter/editorial) | | removalof dissolved iron from the system,primarilyby pyrite precipitation in basinal environments,and on the...seawater. 2. During anoxicdiagenesis,iron is fixed in pyrite during sulfate-reducing diagenetic reactions under...(carbonatezone) Molango GrooteEylandt (carbonatezone) Moanda ? Chamberlain (Gregory Member) pear to be early...n(e.g., laminated shallow-marine rhodochrosite-pyrite deposits). This variation treats the contact between...bivalves (replaced by rhodochrosite)is presentin pyrite-rich rock 6 to 9 m abovethe formationbase,a horizonof |  | | Journal (article/letter/editorial) | | system: Quantitative approach Peter Laznicka Department of Geological Sciences, Universityof Manitoba...51%) evaluated. Correspondence to: P. Laznicka, Department of Geological Sciences, University of Manitoba...lumped together with the output of a larger local mine. The locality registered in the literature is thus...of an orebody (or orebodies). At the old Crimora Mine in Virginia (Eilertsen and Feiss, 1946), "about...credited with 1045 Mn mines. This amounts to one mine per 362 km 2. Canada, on the other hand, has only |  | Polgári, M., Hein, J.R., Vigh, T., Szabó-Drubina, M., Fórizs, I., Bíró, L., Müller, A., Tóth, A.L. (2012) Microbial processes and the origin of the Úrkút manganese deposit, Hungary. Ore Geology Reviews, 47. 87-109 doi:10.1016/j.oregeorev.2011.10.001 | Journal (article/letter/editorial) | | Mangán Ltd. Úrkút, Külterület 1, H-8409, Hungary d Department of Mineralogy, Geochemistry and Petrology, University...shale-hosted Mn-carbonate deposits include Moanda, Gabon (Early Proterozoic, 2.095 Ga), Wafangzi, Gaoyan...Molango—Mexico, Okita, 1987; Okita and Shanks, 1988; Moanda—Gabon, Hein et al., 1989; Úrkút—Hungary, Polgári et...exploited ore volume is 436,000 m 3 and an open-pit mine site covered 1.81 km2 (Fig. 6a). The (ii) black...lithostratigraphy (b) of the Mn carbonate ore bed (Úrkút Mine, Shaft No. III, + 180 m) (c) A–A and B–B sections |  | | Book | | ........................ 97 Example of the Moanda (Gabon) Sedimentary Manganese Deposit Enriched by Lateritization...142 Laterites in a Humid Equatorial Climate:the Gabon Example ....... 145 Conclusions and Perspectives...(PE), Brazil DANIEL JEANNETTE SAM CHAUDHURI Department of Geology, Kansas State University Manhattan...carbonates dans les series rouges mesozo·,ques du Haut-Atlas central (secteur de Telouet- lghrem, Maroc)...continentales epigeniques dans le Jurassique moyen du Haut-Atlas central (Maroc) Double signification des palygorskites |  | Ossa Ossa, Frantz, El Albani, Abderrazak, Hofmann, Axel, Bekker, Andrey, Gauthier-Lafaye, François, Pambo, Florent, Meunier, Alain, Fontaine, Claude, Boulvais, Philippe, Pierson-Wickmann, Anne-Catherine, Cavalazzi, Barbara, Macchiarelli, Roberto (2013) Exceptional preservation of expandable clay minerals in the ca. 2.1Ga black shales of the Francevillian basin, Gabon and its implication for atmospheric oxygen accumulation. Chemical Geology, 362. 181-192 doi:10.1016/j.chemgeo.2013.08.011 | Journal (article/letter/editorial) | | 2.1 Ga black shales of the Francevillian basin, Gabon and its implication for atmospheric oxygen accumulation...Barbara Cavalazzi a,g, Roberto Macchiarelli h,i a Department of Geology, University of Johannesburg, Auckland...Université de Poitiers, 86022 Poitiers, France c Department of Geological Sciences, University of Manitoba...Strasbourg, France e Direction Mine, COMILOG SA, BP 27-28 Moanda, Gabon f Géosciences Rennes, UMR 6118...ca. 2.1 Ga Francevillian Group in southeastern Gabon. The FB Formation of the Francevillian Group is |  | | Journal (article/letter/editorial) | | principal varieties: a) carbonaceous-cher t sericite , pyrite-bearingslates, associated with manganese carbonate...consists of graphite- muscovite-biotitequartz, pyrite-bearing schists, often with andalusite. The graphite...of the Okonja River and in the vicinity of the Moanda deposit. At the base of the Franceville Series...position In the dolomitic slates, silty material and pyrite are disseminated in the matrix which consists of...basin of the Okonja River, located 150 km NE of Moanda, the rhodochrosite- and IGR 81/5 pyrolusite-bearing |  | | Journal (article/letter/editorial) | | contrast the pisoliths of the upper ore zone at Moanda, Gabon, are concretions of weathering origin (Le Clerc...Broken Hill Proprietary (BHP) Co. Ltd. manganese ore mine is currently rated as the No. 3 producer in the...capacity of 2.4 million tonnes per annum. In 1986, the mine produced 2 million tonnes of manganese of which...shales contain mangano-calcite, nickel-containing pyrite and nickel-containing kerogen (Dale et al., 1984)...1984). Mangano-calcite and nickel-containing pyrite also occur in the Groote Eylandt Southern Basin (J |  | | Catalog/List | | specimen •. 2x2xl". £6.00. 10. BARYTES. wetgrove Mine,Aysgarth, Yorkshire.Specimen A:Select lustrous creamy-white...2i;xHxl". £13.00. 2 12. BoTALLACKITE. Levant Mine, Pendeen, Cornwall. Specimen A: Light green lustrous...scattered on und infilling cavities in calcite/pyrite veinstuff, with odd well formed Pyrites crystals...in plac8s. 4x1ix1t", £7.00 14. CALCITE. Black~ene Mine, Weardale, Co. Durham. Select creamy translucent...specimen. 32-x2 x1f..", £7.00 15. CARNOTITE. Gould Mine, Fall River Co., S. Dakota, U.S.A. Bright yellow |  | 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...Regional geological map of Franceville Basin in Gabon (Ossa et al., 2013) that shows location of the study...Lastoursvilles, and Okonja basins in the South Eastern Gabon (Gauthier-Lafaye and Weber, 1989, 2003; Gauthier-Lafaye |  | | Journal (article/letter/editorial) | | phase, e.g., deposits in Africa (South Africa, Gabon, Ghana, Congo), Brazil, Australia, India, Sweden...medium and large manganese deposits (e.g., Moanda deposit, Gabon) (Weber, 1970). Significant Mn reserves...the Marra Gamba BIF, Hammersley basin, Pilbara province (Western Australia). The weathering profiles of...manganese oxides in the Pilbara manganese ore province (Western Australia) located 400 km SE of Port...direction, respectively. The largest deposits in this province are Rippon Hill, Woodie Woodie, Ant Hill, Hitek |  | De Putter, Thierry, Liégeois, Jean-Paul, Dewaele, Stijn, Cailteux, Jacques, Boyce, Adrian, Mees, Florias (2018) Paleoproterozoic manganese and base metals deposits at Kisenge-Kamata (Katanga, D.R. Congo) Ore Geology Reviews, 96. 181-200 doi:10.1016/j.oregeorev.2018.04.015 | Journal (article/letter/editorial) | | East Kilbride, United Kingdom Ghent University, Department of Geology, Mineralogy and Petrology, Krijgslaan...Manganese Field (hereafter 54 KMF), the Moanda deposits of Gabon and the Serra do Navio deposit in Brazil...Kisenge-Kamata area is located in the former Katanga province, 250 km west of 67 Kolwezi (Fig. 1a). Geologically...1973). In the region of Mwene Ditu (Kasai Oriental Province, ~400km 91 North of Kisenge; Fig. 1a), where...such as Mwene Ditu (Fig 1; Kasai Oriental 128 Province; Morelli & Raucq, 1961), for which an E-W elongated |  | | 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...and gypsum and the non oxidized facies contains pyrite and asphaltic material. The limit between red and...channels, are to be observed at different levels. Moanda manganese ore was formed through the weathering |
|
