A REGIONAL UPPER CRETACEOUS MAGNETOSTRATIGRAPHIC SECTION OF WEST SIBERIA

The results of magnetostratigraphic studies of the Upper Cretaceous of West Siberia are presented.  A regional Upper Cretaceous magnetostratigraphic section of this territory was developed by comparing and linking Upper Cretaceous the reference sections of the south of Western Siberia, its center and north. The reliability of paleomagnetic data was determined by the possibility of identifying the primary component of natural remanent magnetization and the structural similarity of the developed scale with the world magnetic polarity scale. Upper Cretaceous of the geomagnetic field in the period from the Upper Albian to the Lower Paleocene, lasting approximately 38 million years, reconstructed from the vectors of natural remanent magnetization, experienced 5 reversals (at the level of magnetozone boundaries) and recorded 3 normal and 2 reverse polarity regime. A regional Upper Cretaceous magnetostratigraphic section of West Siberia includes five magnetozones – three of normal N₁K_1-2(al₂-st), N₂K₂km₂, N₃K₂mt₂ and two of reverse (R₁K₂km₁ и R₂K₂mt₁) polarity, compared with the world magnetic polarity scale. The scientific significance of the work is the first developed Upper Cretaceous regional magnetostratigraphic section of West Siberia. In applied terms, this section will allow for local, regional, interregional and global correlation of sections and geological events, as well as their dating.