Corrélation géologique Afrique-Amérique du Sud et Provinces uranifères

Abstract

The synthesis of the geological and structural data on a Bullard's fit favors the observation of the prolongation from one continent to the other, of cratons, mobile belts, basins and important lineaments. This global representation reveals new observations: one can see for example in Fig. 1 that the opening of the Atlantic follows the mobile belt located south of the cratonic Sao Francisco-Congo area. So we can say that the opening was already written in the facts at 600 Ma. The analysis of the repartition of uranium orebodies superimposed on the maps over the geological data, shows that the Pan-African/Brasilian orogenesis which contains almost one third of the uranium of the South America-Africa block has had a prominent metallogenical role. The comparison of the types of uranium orebodies reveals that the prospection targets have not been exactly the same on both continents. The prolongation on one or the other of the continents of the geological entities hosting the orebodies leads to the definition of favourability areas for future uranium exploration.