On the mode of uranium accumulation in the course of sedimentary rock gleying

Uranium behaviour in the process of sulfide-gley catagenesis is described. The investigations were carried out using f- radiography and electron microscopy. Samples of sandstones and aleurolites from the contact zone of gleyed and non-gleyed (red colour) Riphean rocks were studied. It has been found that in the course of rock gleying by supergene solutions uranium (its major part) accumulates in aggregates of neogenic hydromica in the form of uniform and finely dispersed uranium minerals (mainly beta-uranotil), and to a lesser extent - in the sorbed form in neogenic and relic auxiliary minerals (leucoxene, iron oxides, sphene, orthite)