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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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The Baer knolls as a landscape that served to reconstruct the palaeodelta of the Volga in the Late Pleistoceneтезисы доклада
- Авторы: Lobacheva D.M., Badyukova E.N., Makshaev R.R.
- Сборник: XXI Congress of the International Union for Quaternary Research (INQUA 2023). — INQUA Congress 2023
- Тезисы
- Год издания: 2023
- Место издания: Rome
- Аннотация: Many geological sections in the ledge of the Lower Volga valley have been actively studied since theend of the 19th century. Results many years of field work showed that in all the studied quaternarysections along the Lower Volga valley alluvial sediments of the Khvalynian time (end of the latePleistocene - early Holocene) are absent.Numerous literatures, descriptions of wells, maps were used as research methods. We conductgeomophological mapping out in Arcgis using the SRTM DEM and studied many outcrops along Volgavalley and in the Baer knolls – gyant underwater dunes of the Northern Caspian.We consider the Volga River probably did not flow at the site of its present position in the Khvalyniantime. In this regard, the question arises of where the Volga channel was located in the North-WesternCaspian in the Khvalynian time. Thus, we propose the extreme western branch of the Volga ran alongthe foot of the Eastern Ergeni slopes, eroded the surface of the marine plain, as a result of which theSarpinsko-Davanskaya hollow was formed, the eastern branches of the delta flowed into the Kha-kisaline. Which was one of the estuaries of the Northern Caspian, where the waters of one of theextreme eastern channels of the PaleoVolga stream probably flowed into.In the Khvalynian time, the Volga channel in the lower reaches had multiple terminal distributarychannels at different scales. Where were arcuate fluvial-dominated delta much larger (200-210 kmwide) than the modern delta and somewhat reminiscent of the modern Lena delta in size. In thelocation of the modern Volga-Akhtuba floodplain there was probably a small central branch, in thewest there was a Sarpinsky branch, and in the east, there was an Elton-Khaki branch. They wereinterconnected by an extensive system of branches, the relief of which is still preserved.At the very end of the late Khvalynian time, the Sarpa and Khaki branches began to die off, and mostof the water began to rush along the central branch, forming the modern Volga-Akhtuba valley.
- Добавил в систему: Лобачева Дарья Макcимовна