Paleomagnetism of the Volyn and Mohilov-Podolskyi series of the Vendian of the SW East-European platform
© Glevasskaya A.M., Mikhailova N.P., Kravchenko S.N.
During the paleomagnetic study of Neoproterozoic paleobasalts (Volinskaya series, Lower Vendian) and terrigenous deposits (Grushka suite, Lower Vendian and Mogilev - Podolskaya series, Upper Vendian) from the outcrops of the Volyn and Podolian Peridniester regions (SW part of EEP), T- and AF-demagnetizations confirmed by magnetic-mineralogical data three main NRM components have been separated. The A component has reversed polarity. Its VGPs localized at high latitudes of the North hemisphere coincide with the southern Scandinavian paleopoles of 600-530 my age the B components almost antiparallel to the former one corresponds with some short normal polarity events in Early and Late Vendian. The C component, whose paleopoles are localized at near - equatorial latitudes may be due to later remagnetization of the original NRM. The carriers of A and B magnetization components of basalts are homogenous accessory titanomagnetites (TM) with Curie points ÒC of 260-320° Ñ. The magnetic phases of ÒC>550°Ñ occurring in some basalts of the northern Volyn are the result of high temperature oxidation under the influence of the later central type volcanic activity. The possibility of genetic relation between those oxidation processes, high-temperature remagnetization of oxidated basalts and native copper concentration is founded. Some tectonic problems are discussed. <<back |
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