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Mineralium Deposita

, Volume 32, Issue 6, pp 617–620 | Cite as

Characterization of a La-Ce-Sr-Ca aluminous hydroxy phosphate in nuclear zone 13 in the Oklo uranium deposit (Gabon)

  • Y. Dymkov
  • P. Holliger
  • M. Pagel
  • A. Gorshkov
  • A. Artyukhina
LETTER

Abstract

A La-Ce-Sr-Ca aluminous hydroxy phosphate of the goyazite-florencite-crandallite series was observed in the nuclear reactor zone 13 in the Oklo uranium deposit (Gabon). It has a trigonal elementary cell with a = 6.98 ± 0.03 Å and c = 16.35 ± 0.04 Å (space group P3m). It occurs in a U-rich sample depleted in 235U (235U/238U = 0.0047). Its chemical composition, measured by ion microprobe analyses, shows that it contains fission products (Zr, LREE) whereas the isotopic composition of Ba and Sr is natural. Ion microprobe imaging indicates that the nearby uraninite crystals are depleted in fissiogenic LREE. This study shows that the migration of some fission products, probably related to a dolerite dike intrusion, is limited by the formation of aluminous hydroxy phosphates.

Keywords

Phosphate Migration Uranium Isotopic Composition Nuclear Reactor Zone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Y. Dymkov
    • 1
  • P. Holliger
    • 2
  • M. Pagel
    • 3
  • A. Gorshkov
    • 4
  • A. Artyukhina
    • 1
  1. 1.The All-Russian Research Institute of Chemical Technology (VNIICHT), 33 Kashirsskoe Shosse, Moscow, 115230 RussiaRU
  2. 2.CEA Valrho, DTE/SIM, BP 111-26 702 Pierrelatte Cedex, FranceFR
  3. 3.CREGU and GR CNRS-CREGU – B.P. 23 54501 Vandoeuvre les Nancy Cedex, FranceFR
  4. 4.The Institute of Ore Deposit Geology, Petrography, Mineralogy and Geochemistry, IGEM, 35 Staromonetny, Moscow, 10 9017 RussiaRU

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