Summary about some features of isotopic geochemistry of lead and other elements accompanying radioactive ores

Behaviour of lead isotopes in natural objects containing radioactive elements is considered. Correlation connections of 204 Pb with other isotopes for galenite contaminated with U and Th from USA deposits (r=0,97) and association of minerals of Ukraine of a crystal board (r=0,71) are revealed. Explanation of such facts is possible by assuming that the following reactions take place : 1) deeply asymmetric clustered fission reactions of radioactive nuclei of a type: 235 U - 31P + 204Pb, 235U - 207Pb + 28Si; 2) reactions of mixed fission (term of the authors) at which the first act or first ones go through alpha-decay with formation of intermediate nuclei, and subsequent fissions by spontaneous or neutron-induced and clustered reactions with formation of a wide range of affiliated nuclei: 235U - 204Pb + 31P, 231A - 204Pb + 27Al, ....211A - 204Pb + 7Li. As a result of cumulative action of all fission chains of radioactive nuclei for a geological history of object , it accumulates a wide range of impurities of elements, forming minerals of secondary mineralization. (author). 3 refs., 1 fig