References

geomorf

Геоморфология и палеогеография

Geomorfologiya i Paleogeografiya

2949-17892949-1797

10.31857/10.31857/S2949178925020108

GQIXZR

geomorf-3633

Research Article

Геоморфология гор и предгорий

Лёссово-почвенные серии Центрального Предкавказья: хроностратиграфия, состав и условия осадконакопления в позднем неоплейстоцене

The loess-soil sequence of the Central Ciscaucasia: chronostratigraphy, composition, and sedimentation conditions during the Late Neopleistocene

https://orcid.org/0000-0003-2799-5143

Сычев

Н. В.

Sychev

N. V.

nvsychev25@igras.ru

Константинов

Е. А.

Konstantinov

E. A.

eakonstantinov@yandex.ru

Захаров

А. Л.

Zakharov

A. L.

zaanleo@gmail.com

Институт географии РАН, МоскваРоссияInstitute of Geography RAS, MoscowRussian Federation

2025

06082025

562323340

2025

Сычев Н.В., Константинов Е.А., Захаров А.Л.

Sychev N.V., Konstantinov E.A., Zakharov A.L.

Данная работа распространяется под лицензией Creative Commons Attribution 4.0.

This work is licensed under a Creative Commons Attribution 4.0 License.

https://geomorphology.igras.ru/jour/article/view/3633

В работе представлены результаты исследования керна скважины Первомайская-1 глубиной 13.8 м, вскрывшей наиболее полное строение верхней части плакорной лёссово-почвенной серии (ЛПС) Центрального Предкавказья. Для двух образцов из керна получены люминесцентные даты (62±3 и 102±7 тыс. л. н.), позволяющие отнести всю вскрытую толщу к верхнему неоплейстоцену. На основе макроскопического исследования керна и комплекса вещественных анализов произведено литостратиграфическое расчленение отложений. В основании разреза выявлен мезинский педокомплекс (13.8–9.1 м, MIS 5), состоящий из трех палеопочв; выше залегает мощный горизонт валдайского лёсса (9.1–1.2 м, MIS 4-2) со слабыми признаками интерстадиального почвообразования в средней части; венчает разрез голоценовый чернозем (1.2–0.0 м, MIS 1) с признаками техногенной трансформации верхней части профиля. Разрез обнаруживает сходство с ранее датированными опорными разрезами ЛПС Предкавказья: Беглица, Воронцовка-4, Сладкая Балка-1, Отказное-20 и вписывается в установленный ранее тренд роста мощности и крупности гранулометрического состава лёссов Предкавказья с запада на восток. По согласованным вариациям магнитной восприимчивости и гранулометрического состава проведена корреляция с детально датированным разрезом Отказное-20, и на этой основе выполнена детализация глубинно-возрастной модели разреза Первомайская-1. Полученная модель позволила сделать расчетные оценки темпов лёссонакопления для позднего неоплейстоцена и голоцена. Максимальные темпы (15.9–17.5 см/тыс. лет) отмечаются в интервале 36–16 тыс. л. н.; повышенные (11.4–12.5 см/тыс. лет) – 80–40 тыс. л. н.; низкие (9.1–10.4 см/тыс. лет) – 128–81 тыс. л. н.; минимальные (6.0–6.6 см/тыс. лет) – 13–5 тыс. л. н. Изменение интенсивности лёссонакопления во времени согласуется с наиболее полными плакорными ЛПС Восточной Европы, а также с концентрацией аэрозольных минеральных частиц в гренландском ледниковом керне NGRIP.

The study presents the results of sedimentological investigation of the core recovered from from the Pervomayskaya-1 (Pm-1) borehole, which revealed the most complete structure of the upland loess-soil series (LSS) in the central Pre-Caucasus. The borehole reached a depth of 13.8 m. Luminescence dating for two samples from the core yielded ages of 62±3 and 102±7 thousand years, attributing the entire studied sequence to the Upper Neopleistocene. Lithostratigraphic units were identified based on macroscopic core examination and geochemical analyses. The Mezin pedocomplex (13.8–9.1 m, MIS 5) consisting of three paleosols was identified at the base of the section. Above it lies a horizon of Valdai loess (9.1–1.2 m, MIS 4–2) of substantial thickness with weak signs of interstadial pedogenesis in its middle part. The section is capped by a Holocene chernozem (1.2–0.0 m, MIS 1) showing signs of anthropogenic transformation in its upper profile. The LSS structure revealed in the Pm-1 core shows stratigraphic unity with previously dated reference sections and boreholes of the Pre-Caucasus LSS: Beglitsa (Bg), Vorontsovka-4 (V-4), Sladkaya Balka-1 (Sb-1), and Otkaznoye-20 (Ot-20). Moreover, the Pm-1 column fits within the main trend of increasing loess thickness and grain size from west to east across the Pre-Caucasus. For the Pm-1 and Ot-20 columns, consistent variations in magnetic susceptibility and grain size were identified. Using these consistent variations as chronostratigraphic markers allowed for a more detailed depth-age model for Pm-1. Based on this model, estimates of loess accumulation rates for the Late Neopleistocene and Holocene were calculated: maximum rates (15.9–17.5 cm/thousand years) correspond to the interval of 36–16 thousand years ago; elevated rates (11.4–12.5 cm/thousand years) align with the interval of 80–40 thousand years ago; low rates (9.1–10.4 cm/thousand years) were recorded in the interval of 128–81 thousand years ago; minimal rates (6.0–6.6 cm/thousand years) correspond to the interval of 13–5 thousand years ago. The intensity of loess accumulation in Pm-1 shows consistency with the most complete LSSs of Eastern Europe, as well as with the mineral dust concentration in Greenland ice core NGRIP.

минеральная пыльгеологическая корреляциялюминесцентное датированиевозрастное моделированиетемпы осадконакопления

mineral dustgeological correlationluminescence datingage modelingsedimentation rates

Лабораторно-аналитические исследования выполнены за счет средств гранта РНФ № 21-77-10104. Полевые исследования проведены в рамках ГЗ Института географии РАН № FMWS-2024-0003. Коллектив авторов выражает благодарность Н. Т. Ткачу, Е. А. Мазневой и В. С. Шишкину за неоценимую помощь в проведении полевых работ

Laboratory and analytical studies were carried out with funds from the Russian Science Foundation Project No. 21-77-10104. Field research was carried out within the framework of the State Budget of the Institute of Geography of the Russian Academy of Sciences No. FMWS-2024-0003. The team of authors expresses gratitude to N. T. Tkach, E. A. Mazneva for invaluable assistance in conducting field work

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The authors declare that there are no conflicts of interest present.