Contribution to Uranium Geochemistry in Intrusive Granites; CONTRIBUTION A LA GEOCHIMIE DE L'URANIUM DANS LES GRANITES INTRUSIFS
Thesis/Dissertation
·
OSTI ID:4193726
The position is defined of a certain number of French granitic deposits within the field of the geochemistry of granites in general, and of the geochemistry of uranium in particular. The regions concerned are the French hercynian ranges, in the Vendee, in Brittany and in the Morvan, and the African range, probably precambrian, of the Hoggar. For each range the petrochenaical framework is first of all determined and then the degree of chemical homogeneity of the rocks is evaluated. In the petrochemical groups thus obtained the geochemical behavior of the uranium is studied. From the viewpoint of the geochemistry of the granites under investigation, a comparison of the laws of distribution of the major elements in the ranges shows up a convergence of average composition which was not anticipated by geological and petrographic considerations alone. The statistical and geochemical distribution laws of the total uranium as a function of the petrochemical variations are established. A study of the chemical forms of uranium in the rocks has drawn an attention to the qualitative and quantitative importance of the fraction of this uranium soluble in dilute acids. The laws of distribution of the insoluble uranium, which represents essentially the uranium fixed in crystalline structures (zircon, allanite...), and the interest presented by the soluble uranium are discussed. This, although more complex in character, presents a geochemical unity in postmagmatic phenomena wltich makes it possible to find a genetic connection between the uraniferous deposits and the intrusive massifs. Finally, a plan of the geochemical cycle of uranium is given in which is hoped to provide some more accurate data on the igneous phase. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique, Paris
- NSA Number:
- NSA-14-009631
- OSTI ID:
- 4193726
- Report Number(s):
- CEA-1173
- Country of Publication:
- France
- Language:
- English
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