Correlation of the Late Pleistocene paleogeographical events of the Caspian Sea and Russian Plain

Yanina, T.A.

Автор: Yanina T.A.
Журнал: Quaternary International
Номер: 271
Год издания: 2012
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 120
Последняя страница: 129
DOI: 10.1016/j.quaint.2012.06.003
Аннотация: In the present work the author shows her concept of paleogeographic development of the Caspian Sea in the Late Pleistocene, based on the comprehensive analysis of the Caspian deposits and their relation and synchronization with glacial-interglacial cycles on the Russian Plain, based on published materials. Global climate changes were fundamental for both the transgressive-regressive state of the Caspian basins, as well as for glaciers formation and their degradation on the Russian Plain. At the same time, glaciers influenced the Caspian basins development on a regional level. The long-term low Caspian Sea level, complicated by the double-stage “minor” Late Khazar transgres-sion, corresponded to the Mikulino (Eemian) interglacial with two endothermals in structure. This warm stage in the Caspian history encompassed the interval corresponding to the Marine Isotope Stage (MIS) 5. This is in agreement with the point of view of researchers who correlate the Mikulino interglacial with the entire MIS 5. The “cold” vast Khvalynian transgression and preceding to it the Atel regression developed during the Valday glaciation (MIS 4-2). The Atel regression corresponds to cold MIS 2 and beginning of MIS 3. Its lower boundary in the Lower Volga region is marked with ice wedges. Transgressive tendency began to show in the second half of the interstadial (second half of MIS 3) and continued into early stages of the Late Valdai cooling, but it was interrupted during the dry and cold Glacial Maximum (peak of the MIS 2) by the regressive stage. Further transgression development occurred during the degradation of the glaciation. Its course was impacted by transgressive-regressive events of lower magnitude linked to oscillations of climatic pa-rameters: i.e., cold dry conditions of the Middle Dryas by the Enotaevka regression, and the con-tinentalization of the Boreal period of the Holocene by the Mangyshlak regression.
Добавил в систему: Янина Тамара Алексеевна

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Correlation of the Late Pleistocene paleogeographical events of the Caspian Sea and Russian Plainстатья

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