Géochimie de l'uranium dans les minéraux phylliteux et les roches du massif granitique de Mortagne-sur-Sèvre, (Vendée) France

Geology and genesis of major world hardrock uranium deposits, an overview

“…Ranchin, 1971;Renard, 1974;Le and Stussi, 1973;Cuney 1978). The major source of uranium reconstituted as uraninite is possibly biotite that has been altered to chlorite or muscovite (Jurain and Renard, 1970;Renard, 1974). During this reconstitution total uranium in the rock remains approximately constant but the uraninite-bearing granite becomes "fertile" (Moreau and others, 1966), meaning that the uranium can be leached by hydrothermal or supergene fluids.…”