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Precipitation of Uraninite in Chlorite-Bearing Veins of the Hydrothermal Alteration Zone (Argile De Pile) of the Natural Nuclear Reactor at Bangombé, Republic of Gabon

Published online by Cambridge University Press:  15 February 2011

P. Eberly ,
J. Janeczek  and
R. Ewing
P. Eberly
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. (e-mail: [email protected])
J. Janeczek
Affiliation:
Department of Earth Sciences, Silesian University, Bedzinska 60,41–200 Sosnowiec, Poland
R. Ewing
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. (e-mail: [email protected])
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Abstract

This paper describes the mineralogy of a phyllosilicate/uraninite/galena-bearing vein located within the hydrothermal alteration halo associated with the Bangombé reactor. Phyllosilicates within the vein include a trioctahedral Al-Mg-Fe chlorite (ripidolite), Al-rich clay (kaolinite and/or donbassite) and illite. Textural relations obtained by backscattered-electron imaging suggest that ripidolite crystallized first among the sheet silicates. Uraninite is spatially associated with ripidolite and probably precipitated at a later time. While energy-dispersive x-ray analyses suggest that the uranium phase is predominantly uraninite, coffinite or other phases may also be present.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 1195
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1. Nagy, B., Gauthier-Lafaye, F., Holliger, P., Davis, D., Mossman, D., Leventhal, J., Rigali, M. and Parnell, J., Nature 354, 472 (1991).Google Scholar
2. Gauthier-Lafaye, F., Weber, F. and Ohmoto, H., Economic Geology 84, 2286 (1989).Google Scholar
3. Bros, R., Gauthier-Lafaye, F., Larqué, P. and Stille, P., in Bangombé Reactor: Petrography, Mineralogy and Geochemistry of the Solid Phases, Preliminary Reports, edited by Gauthier-Lafaye, F. (Centre de Géochimie de la Surface, Strasbourg, France. 1994).Google Scholar
4. Janeczek, J. and Ewing, R., in Proceedings of the Third CEC-CEA Oklo Working Group Meeting, EUR-report, (Commission of the European Communities, Luxembourg, Luxembourg, 1993).Google Scholar
5. Papike, J., Reviews of Geophysics 26, 407 (1988).Google Scholar
6. Bailey, S.W. and Lister, J.S., Clays and Clay Minerals 37, 193 (1989).Google Scholar
7. Deer, W., Howie, R. and Zussman, J., An Introduction to the Rock-Forming Minerals, (Longman Group Limited, London, Great Britain, 1966), p. 257.Google Scholar
8. Weaver, C. and Pollard, L., The Chemistry of Clay Minerals: Developments in Sedimentology 15 (Elsevier Scientific Publishing Company, Amsterdam, Netherlands, 1973).Google Scholar
9. Janeczek, J. and Ewing, R.C., Geochimica Cosmochimica Acta, submitted.Google Scholar
10. Nutt, C.J., Canadian Mineralogist 27, 41 (1989).Google Scholar