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Russian Geology and Geophysics

2007 year, number 4

LATE CENOZOIC PALEOMAGNETISM OF WEST SIBERIAN PLATE

Z.N. Gnibidenko
Institute of Petroleum Geology and Geophysics, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Paleomagnetic scale; geomagnetic field; magnetic minerals; orthozone; fauna; seed assemblages; palynoflora; Neogene; West Siberian Plate
Pages: 337-348

Abstract

On the basis of combined (paleomagnetic, lithological, and paleontological) data, a scale of Neogene geomagnetic polarity is proposed for the West Siberian Plate (WSP). It comprises 17 large orthozones of normal and reversed polarity. The scale was compiled by comparing and correlating the Neogene key sections of the Kulunda and Baraba plains, Irtysh regions between Omsk and Pavlodar and near Tara, and Ob' region near Tomsk. The reliability of paleomagnetic data is confirmed by component analysis of natural remanent magnetization and by a possibility of determining its primary component. In the studied Neogene rocks this is a high-temperature component related to magnetite, hematite, and maghemite, which decays at 420-675