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Paleosol Record of the Transition MIS5–MIS4 Thermochron in the Belaya Gora Section (Vakh River, Western Siberiaстатья
- Авторы: Sedov S.N., Rusakov A.V., Sheinkman V.S.
- Журнал: Moscow University Soil Science Bulletin
- Том: 80
- Номер: 4
- Год издания: 2025
- Издательство: Allerton Press Inc.
- Местоположение издательства: United States
- Первая страница: 473
- Последняя страница: 492
- DOI: 10.55959/MSU0137-0944-17-2025-80-4-7-27
- Аннотация: The discovery of Pleistocene paleosols, including the level corresponding to the previous interglacialperiod (MIS5e), in the north of Western Siberia is of fundamental importance for Quaternary stratigraphyand paleoecology. This paper presents for the first time the results of a study of a pedocomplex that wasfound in the Belaya Gora section (Vakh River valley). The period of its formation, established through uranium–thorium dating and taking into account paleobotanical and paleontological data, spans from the endof MIS 6 to MIS 4 inclusive. A morphogenetic analysis at the macro-, meso-, and micro-levels, as well asdata on granulometry, mineralogy, and humus composition (including the humic acid/fulvic acid ratio andproportions of the main structure-forming elements (C, H, and N) in humic acids), have made it possible toreconstruct the succession of pedogenetic, sedimentary, and cryogenic processes. A paleoecological reconstructionand chronostratigraphic attribution of all pedocomplex levels were carried out based on the resultingcomprehensive geological record and using the previously published paleontological data. A paleosol subprofilecorresponding to the warmest substage MIS 5e, the Kazantsevo thermochron, has been identified. At thesame time, it has been shown that the permafrost–gley (cryohydromorphic) stage, which marks the end ofthe formation of each paleosol level and took place during the cold substages of MIS5, has a dominant influenceon paleosol morphology and masks the features of preceding, warmer phases. The unexpected findingof newly formed gypsum crystals in combination with ferruginous nodules has been explained by the oxidationof previously formed pyrite and has also been attributed to the cryohydromorphic phase of paleopedogenesis.An interregional correlation of the studied profile with pedostratigraphic schemes of the loess formationin adjacent regions (East European Plain and south of West Siberia) has been carried out. Correlativelevels have been identified in loess–paleosol sequences for most of the elements of the studied pedocomplexand the overlying sedimentary and cryogenic MIS4 units except the paleosols
- Добавил в систему: Шейнкман Владимир Семенович