Loess-paleosol sequence and environmental trends during the MIS5 at the southern margin of the Middle Russian UplandстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:The study of the depositional environment, pedogenesis, and pedostratigraphy of the MIS5 paleosols within theOSL chronological framework is the focus of this paper. Field data are supported by micromorphology, grain sizedistribution, chemical, and geochemical properties. The buried paleosols reveal the dramatic environmentaltrend (progressive aridization and cooling) from the Last Interglacial to the end of the Early Glacial. The lowerpaleosol (Albic Retisol) corresponds to the moderately warm and humid climate of boreal mixed forests duringthe Last Interglacial (MIS5e). Throughout the transition to the Early Glacial, boreal forests were replaced by productiveboreal steppe with Chernozems and then by cold, arid steppe with Calcic Cambisols. Cryogenesis accompaniedpedogenesis during the whole Early Glacial period. The diagenetic impact resulted in a decrease in organiccarbon and the calcification of Albic Retisol. The tripartite pattern of the MIS5 chronozone of LPS Strigunymay serve as a good stratigraphic marker for the onset of the Late Pleistocene, allowing correlation with loesspaleosolsequences of the Northern Hemisphere and linking it with global climatic fluctuations recorded in marinesediments. The buried Glossic Albic Retisol is similar to the modern soils of the Southern Taiga, which nowoccur 500 km to the north of the study area. This means that the bioclimatic pattern during the last interglacialwas different than it is today. The present study establishes the current most southerly position of the forest soilof the Last Interglacial on the Russian Plain.