The upper Pleistocene loess-palaeosol sequence at Solonovka on the Cis-Altai plain, west Siberia – First luminescence dating results

Meshcheryakova, O.A.; Volvakh, N.E.; Kurbanov, R.N.; Zykina, V.S.; Zykin, V.S.; Murray, A.S.; Volvakh, A.O.; Malikov, D.G.; Buylaert, J.P.

Авторы: Meshcheryakova O.A., Volvakh N.E., Kurbanov R.N., Zykina V.S., Zykin V.S., Murray A.S., Volvakh A.O., Malikov D.G., Buylaert J.P.
Журнал: Quaternary Geochronology
Том: 73
Год издания: 2022
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 28
Последняя страница: 38
Номер статьи: 101384
DOI: 10.1016/j.quageo.2022.101384
Аннотация: Loess-palaeosol deposits of the Upper Pleistocene cover an extensive territory in the south of Western Siberia. Previously, most studies of loess-palaeosol sequences were carried out on river bank sections of the Ob river around Novosibirsk and upstream of this location (Ob Loess plateau); more recently, the focus of research has shifted towards the inner part of the Cis-Altai plain. Despite a good knowledge of the structure of regional loess-palaeosol sequences, there is a considerable lack of absolute dating beyond the radiocarbon limit. However, recent high resolution luminescence dating of a key Marine Isotope Stage 5 (MIS 5) stratotype at Lozhok has identified the presence of a long hiatus in the deposit. As a result, the published ages of the main units have been underestimated, because the existing chronology is largely based on palaeosol counting. This new observation argues for an urgent re-evaluation of the accepted chronostratigraphy of Western Siberian Late Quaternary. Here we present the first luminescence data for a loess-palaeosol sequence of the Cis-Altai plain, at the Solonovka key section, using both quartz optically stimulated luminescence and feldspar post-infrared infrared stimulated luminescence from 25 samples. The results show that the deposits were formed during the Late Pleistocene. The ∼1 m thick well-developed upper pedocomplex (PC1) has cryoturbation cracks filled with upper loess; this a characteristic regional benchmark for stratigraphic correlation. Two distinct hiatuses in sedimentation are found in the section: at the boundary of MIS 3/2, and after the formation of the MIS 5 Berdsk pedocomplex (PC3 and 2) until the beginning of the formation of MIS 3 deposits. The age of the thick PC3 palaeosol at the base of the section is determined as MIS 5, confirming evidence for the pronounced Kazantsevo (Eemian) interglacial in the loess-palaeosol record of Western Siberia. The results of our study emphasize the importance of understanding the palaeogeomorphological background to soil development, and the necessity of absolute chronology; we consider that the position of MIS 5 in the regional chronostratigraphic chart of South Western Siberia requires further study.
Добавил в систему: Курбанов Реджеп Нурмурадович

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The upper Pleistocene loess-palaeosol sequence at Solonovka on the Cis-Altai plain, west Siberia – First luminescence dating resultsстатья

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