Skip to main content Accessibility help
×
Home

SIMS Analysis of Lead Isotopes in the Primary Ore Body of the Koongarra Deposit, Australia: Behavior of Lead in the Alteration of Uranium Minerals

  • H. Isobe (a1), H. Hidaka (a2) and T. Ohnuki (a1)

Abstract

Lead, the final decay product of uranium, is found in natural uranium ore deposits. The isotope composition of lead in uranium-bearing minerals reflects their age and the migration behavior of lead. Secondary Ion Mass Spectroscopy (SIMS) can be used to analyze the isotopic composition of minerals. SIMS analysis of lead contained in the Koongarra uranium deposit, Australia, revealed that uraninite and uranyl minerals with different chemical composition in the primary ore region have homogeneous lead isotope, from the highest grade area to a uranyl silicate zone at a distance of 6.1m. Uranyl minerals, which have good crystallinity and retain stoichiometric composition, have “old” lead isotope composition identical to that of uraninite. Uranyl minerals keep exchanging lead with ground water in the primary ore region through metamictization and recrystallization by alpha-decay damage. Sulfide minerals just outside the primary ore body contain only radiogenic lead with an isotopic composition different from that of uranium minerals. Lead that migrated from the primary ore body formed sulfide minerals in a specific geological event. Since then, lead produced from uranium decay has been retained in the primary ore body, in spite of recrystallization of uranyl minerals and exchange and homogenization of lead isotopes. Uranium minerals may retain minor elements despite intense alpha-decay dose.

Copyright

References

Hide All
1 Faure, G., Principles of Isotope Geology, John Wiley & Sons, New York, 1977, p. 282.
2 Schäfer, H-J., Gebauer, D., Ndgler, T.F., and Eguiluz, L., Contrib Mineral Petrol, 113, 289 (1993).
3 Snelling, A.A., in Proceedings of Internatonal Uranium Symposium on the Pine Creek Geosyncline, edited by Ferguson, J. and Boleby, A.B. (International Atomic Energy Agency, Vienna, 1980) p. 487.
4 Airey, P.L., Chemical Geology, 55, 255 (1986).
5 Hills, J.H. and Richards, J.R., Mineral. Deposita, 11, 133 (1976).
6 Page, R.W., Compston, W. and Needam, R.S., in Proceedings of Internatonal Uranium Symposium on the Pine Creek Geosyncline, edited by Ferguson, J. and Boleby, A.B. (International Atomic Energy Agency, Vienna, 1980) p. 39.
7 Maas, R., Economic Geology, 84, 64 (1989).
8 Isobe, H., Murakami, T. and Ewing, R.C., Journal of Nuclear Materials, 190, 174 (1992).
9 Chen, J.H. and Wasserberg, G.J., in Fourteenth Lunar and Planetary Science Conference. Abstracts, Part 1 (Lunar and Planetary Institute, Houston, Texas, 1983) p. 103.
10 Chakoumakos, B.C., Murakami, T., Lumpkin, G.R. and Ewing, R.C., Science, 236, 1556 (1987).

Related content

Powered by UNSILO

SIMS Analysis of Lead Isotopes in the Primary Ore Body of the Koongarra Deposit, Australia: Behavior of Lead in the Alteration of Uranium Minerals

  • H. Isobe (a1), H. Hidaka (a2) and T. Ohnuki (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.