Abstract
In the transitional zones from the Bazhenov Formation and to the enclosing deposits the complex of litological-geochemical researches, including the analysis of sections structure, distributions of C/S ratio and redox indicators (degree pyritization, authigenous uranium, Mn/Al) were made. It is defined that rocks on the borders with the Bazhenov Formation at the enclosing deposits are low carbonaceous with rather high content of pyrite; in the Bazhenov Formation near its roof in many cases rocks are characterized by approximately equal high contents of pyrite and kerogen. It is established that the pyritization of rocks on these intervals resulted by thermochemical sedimentation of iron from solutions on redox geochemical barriers without participation of bacterial activity.
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