Results of paleomagnetic studies of the Danube terraces section and problems of magnetostratigraphy of Pleistocene of the west Prychernomoria
© V.G. Bahmutov, I.N. Mokryak, T.V. Skarboviychuk, V.I. Yakuhno
Loess-paleosol sequences from the northwestern part of the Black Sea region (Easteuropean loess province) were paleomagnetically studied over and over again. The Matuyama-Brunhes boundary was found in the different outcrops across the Dniester river and has been used like a key marker for correlation of loess-paleosol sequences. According to the modern point of view this boundary lies in oxygen isotope stage 19 and is coincident with the Martonosha horizon according to the Quaternary stratigraphic scheme of Ukraine.
27-meters loess-paleosol outcrop of the Danube river (near Reni village) was the subject of paleomagnetic study. This Pleistocene sequence from the Martonosha horizon in the bottom to the Dnieper horizon in the top was presented by samples from 188 levels. Subsequent AF demagnetization has allowed to separate the NRM components and to determine the samples with reverse polarity in the middle-bottom part of the section. It was unambiguous Matuyama-Brunhes boundary. No more remarkable paleomagnetic events were encountered. The behavior of magnetic susceptibility curve was similar to the famous loess sequence of the Dniester terrace Roxolany. The results have shown a good correlation of directional changes recorded in coeval sediments of the Danube and Dniester terraces. The present paleostratigraphic schemes of the western Black Sea region are also discussed.