Paleohydrological changes in the eastern Baltic Sea during the Middle/Late Pleistocene transition and the Last Interglacial

Ruchkin, M.V.; Sheetov, M.V.; Taldenkova, E.E.; Pushina, Z.V.; Dudanova, V.I.; Ovsepyan, Y.S.; Konstantinov, E.A.; Nosevich, E.S.; Mustafin, M.A.

Авторы: Ruchkin M.V., Sheetov M.V., Taldenkova E.E., Pushina Z.V., Dudanova V.I., Ovsepyan Ya S., Konstantinov E.A., Nosevich E.S., Mustafin M.A.
Журнал: Quaternary Science Reviews
Том: 360
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 1
Последняя страница: 22
Номер статьи: 109244
DOI: 10.1016/j.quascirev.2025.109244
Аннотация: Finland, Lake Ladoga, Lake Onega basins and the connecting straits. Paleohydrological changes in the Mga Seaevolution are traced with a multiproxy approach using X-ray fluorescence, carbon and nitrogen (CN), grain size,X-ray diffraction (XRD) analyses, along with microfossil data (diatoms and benthic foraminifers) for Mikulino(Eemian) and Upper Moscow (Upper Saalian) marine sediments in the Sverdlov Factory section of the NevaLowland (St. Petersburg region, Russia). In addition, varve chronology is applied to the Upper Moscow glaciomarine/glaciolacustrine deposits as time constraints on paleogeographic changes in the Mga basin during theMiddle/Late Pleistocene transition. The results indicate that saline waters entered the glacial lake in the peripheryof the Scandinavian Ice Sheet at least 1100 years before the onset of the Mikulino Interglacial. During theperiod between ~1050 and 550 years before the LIG, the basin was freshened and became again connected withthe ocean afterwards. In the early LIG, the Mga Sea experienced brackish conditions with predominantlyoxygenated near-bottom waters indicated by an impoverished benthic foraminiferal assemblage with Elphidiumclavatum as dominant species, as well as by geochemical and lithological proxies. Diatom and geochemical datareveal a steep rise in water salinity and depth in the middle of the Quercus regional pollen assemblage zone(RPAZ M4). The highstand phase lasted until regression began in the Carpinus-Picea zone (RPAZ M6-7). The increasein water salinity and depth led to the spread of marine molluscs at the base of RPAZ M5, though limited toa few species due to the onset of hypoxia in near-bottom waters. Fully anoxic conditions were established at theend of RPAZ M5 and persisted till the end of the Mikulino Interglacial, with a brief oxygenation excursion in thefirst half of the Pinus zone (RPAZ M8). At the end of RPAZ M8 or at the beginning of the Early Valdai (EarlyWeichselian), the Mga basin became freshwater. The Mga Sea shared much similarity with the Late Glacial/Holocene Baltic Sea in evolution patterns.
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Paleohydrological changes in the eastern Baltic Sea during the Middle/Late Pleistocene transition and the Last Interglacialстатья

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