The Early Khvalynian stage in the Caspian Sea evolution: pollen records, palynofloras and reconstructions of paleoenvironments

Bolikhovskaya, N.S.; Makshaev, R.R.

Авторы: Bolikhovskaya N.S., Makshaev R.R.
Журнал: Quaternary International
Номер: 540
Год издания: 2020
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 10
Последняя страница: 21
DOI: 10.1016/j.quaint.2019.11.012
Аннотация: In addressing the controversial issues of the Late Pleistocene paleogeography of theCaspian basin, an important role is given to the results of the spore-pollen analysis andbased on them reconstructions of climate and vegetation changes in the NorthernCaspian region during the development of the Early Khvalynian transgression. In thispaper we present the main results of the palynological study of deposits (chocolateclays and the overlying and underlying layers from the Srednyaya Akhtuba section) ofmaximum stage of the Early Khvalynian transgression; the materials are illustrated bypollen diagram with the data of spore-pollen analysis and the detailed list of palynoflorarecovered from the studied Lower Khvalynian sequences, and complemented withphotographs of pollen belonging to the principal autochtonous taxa and, forcomparison, to some redeposited palynomorphs. Palynological materials indicatesubaqual (brackish marine and freshwater) sedimentation of the sediments studied inperiglacial landscapes and, for the most part, under very harsh climatic conditions. Theperformed climate-stratigraphic reconstructions do not contradict the data of absolutedating on the accumulation of the studied deposits during the Late Valdai (Ostashkov)late Glacial period. During this interval in the territory of the study area, plantcommunities of the glacial climate — tundra-steppe, periglacial forest-steppe,periglacial steppe, periglacial parklands and periglacial forests — were developed. Thewidespread occurrence in the composition of the periglacial vegetation cover of thestudied region of the yernik formations from Betula nana and shrub communities fromBetula fruticosa, B. nana, Alnaster fruticosus, Juniperus, etc. testifies to the severeclimatic conditions and, possibly, the existence of sporadic permafrost in the coldstages (stadials) of the Ostashkov Late Glacial period.
Добавил в систему: Макшаев Радик Рафаэлевич

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The Early Khvalynian stage in the Caspian Sea evolution: pollen records, palynofloras and reconstructions of paleoenvironmentsстатья

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