UPPER CRETACEOUS PALEOMAGNETISM AND STRATIGRAPHY OF NORTHERN WESTERN SIBERIA

The article presents the results of paleomagnetic and magnetostratigraphic studies of the Upper Cretaceous of northeast of Western Siberia, opened by three wells: Kharampur 106P, Zapadno-Chaselka 1P and Novo-Chaselka 5P. According to the results of biostratigraphic studies, the studied sediments were formed in the Upper Cenomanian - Maastricht time interval. Based on complex (paleomagnetic and biostratigraphic) data obtained from three wells, magnetostratigraphic sections were constructed based on the synthesis of which a consolidated magnetostratigraphic section of the Upper Cretaceous of the Pur-Taz interfluve was first developed. This section consists of three magnetozones: one forward NK2(sn-st(2)) and two reverse (R(1)K(2)cp and R(2)K(2)m(1)) polarity, compared with the Ogg world scale of magnetic polarity. The resulting composite section will be one of the fragments of the regional magnetostratigraphic section (scale) of the Upper Cretaceous of the entire Western Siberia (its north, central part and south). This is its fundamental scientific and theoretical significance. From an applied practical point of view, this consolidated section already allows for correlation and dating of sedimentary deposits, and can be used to correct Regional stratigraphic Schemes of the Upper Cretaceous of Western Siberia, the layout of which is being actively discussed.