New Data on Geochronology of the Upper Quaternary Loess–Soil Series in the Terek–Kuma Lowland

Sychev, N.V.; Konstantinov, E.A.; Zakharov, A.L.; Frechen, M.; Tsukamoto, S.

Авторы: Sychev N.V., Konstantinov E.A., Zakharov A.L., Frechen M., Tsukamoto S.
Журнал: Lithology and Mineral Resources
Том: 57
Номер: 4
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 336
Последняя страница: 347
DOI: 10.1134/s0024490222040071
Аннотация: Drilling recovered the upper part (23 m) of the upland loess–paleosol series (LPS) on the rightbank of the Kuma River near the Otkaznoe Settlement. Description of cores and laboratory analyses made itpossible to carry out lithostratigraphic subdivision of the loess sequence in the summary column. Fourpaleosol units separated by loess horizons are identified. The two lower contiguous paleosols are defined wellin the cores by their dark brown color and high values of magnetic susceptibility. The other two paleosols areweakly expressed and identified mainly by variations in the mechanical composition and contents of organicmatter and carbonates. Analysis of 13 luminescence dates obtained in two different laboratories (four dates atKarpinsky Russian Research Geological Institute (VSEGEI), St. Petersburg, Russia; nine dates at LeibnizInstitute for Applied Geophysics (LIAG), Hannover, Germany) shows that the LPS belongs to the LatePleistocene and Holocene. Based on the dates, three (two Bayesian and one linear) depth-age models wereconstructed. The linear model is in better agreement with the stratigraphic sequence and the cross-regionalloess correlation. The age of boundaries of the stratigraphic units was calculated, and a preliminary correlation with the marine oxygen isotope stages (MIS) was carried out: soil S0—MIS 1; loess L1LL1—MIS 2;paleosol L1SS1—MIS 3; loess L1LL2—MIS 4; paleosol S1SS1—MIS 5a; loess S1LL1—MIS 5b; paleosolS1SS2—MIS 5c; loess S1LL2—MIS 5d; and paleosol S1SS3—MIS 5e. Calculations of the sedimentationrate yielded the following results: minimum growth rate of the loess sequence in the Holocene (9 cm/ka) andMikulino time (10 cm/ka); maximum rate, at the end of the middle–beginning of the late Valdaian(79 cm/ka). Pedostratigraphy and compositional variations give grounds for correlating the summary columnwith the core of reference Borehole-1 drilled in the Otkaznoe Settlement in 1986.
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New Data on Geochronology of the Upper Quaternary Loess–Soil Series in the Terek–Kuma Lowlandстатья

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