Geologicheskii Vestnik

New paleomagnetic data on the Lower Carboniferous volcanites of the Central-Magnitogorsk zone (Southern Urals) are represented in the paper. An independent assessment of the geological concepts of the history of the Magnitogorsk Island Arc development was the main aim of our study. Nine sections of effusive basic rocks which are attributed to the Grekhovskaya and Berezovskaya Formations, located in the meridional current of the Ural River between Kizilskoe and Ershovka villages were chosen for our study. Paleomagnetic investigations were conducted in accordance with the generally accepted up-to-date methodology including thermal magnetic cleaning and component analysis of identified directions of magnetization. The average direction of the high-temperature component of remanence obtained from the 21 sites and the paleolatitude calculated from it practically coincide with the world-known data for the eastern margin of the paleocontinent Baltica. Consequently, based on the paleomagnetic data, it can be concluded that during the early Carboniferous period the Central Magnitogorsk Zone was part of Baltica continent. An analysis of the middle-temperature components of magnetization allows to conclude that the bulk of the deformations in the territory of the Central part of the Magnitogorsk Zone (MagnitogorskBogdanovka graben) occurred later than in the West-Magnitogorsk Zone studied by the authors.

paleomagnetism, high-temperature component of magnetization, pole, Carboniferous, Southern Urals, Magnitogorsk-Bogdanovka graben

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