[en] Studied has been post sedimentary uranium distribution in cenozoic sedimentary deposits of the Western Siberia by means of determination of uraniUm amounts in allochthonous leucoxene which initially did not contain uranium. The study of uranium distribUtion in selected minerals has been carried out with an aid of microradiographic analysis of sections. Investigation results and previously established experimental ability of titanium hydroxides to separation from solutions of uranium hydroxides permit to make a supposition that in nature Ti hydroxides are capable of uranium concentrating. Ti hydroxides are formed in the process of change of Ti-containing minerals. At infiltration of uranium-containing minerals with oxygen waters in grey-colour sediments uranium can be extracted by leucoxenes. The utmost U amounts are established in the intermediate zone on the boundary of oxidation-reduction conditions