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Journal of the Geological Society; 1988; v. 145; issue.1; p. 157-162;
DOI: 10.1144/gsjgs.145.1.0157
© 1988 Geological Society of London

Article

Fluid inclusions related to uranium deposits: a review

B. POTY & M. PAGEL

Centre de Recherches sur la Géologie de l'Uranium and GS CNRS-CREGU, BP. 23, 54501 Vandoeuvre-les-Nancy Cedex, France

Fluid inclusions have been observed and studied in rocks of most types of uranium deposits, except surflcial ones such as calcretes and the roll-type in sandstone. Temperatures of formation range up to nearly 400 °C but most deposits were formed at more moderate temperatures of 90–250 °C. It is evident from the relatively small number of studies, however, that the ore-forming process occurred at deeper levels than previously thought.

The chemistry of the fluids ranges from nearly pure water to very dense brines and CO2 is a common component. In some cases gas analyses allow determination of fO2 of the fluid, a key parameter for uranium transport and deposition.