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Multidisciplinary Study of the Rybachya Core in the North Caspian Sea during the Holoceneстатья
- Авторы: Berdnikova Alina, Lysenko Elena, Makshaev Radik, Zenina Maria, Yanina Tamara
- Журнал: Diversity
- Том: 15
- Номер: 150
- Год издания: 2023
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- DOI: 10.3390/d15020150
- Аннотация: Mollusk fauna is an important component of the Caspian Sea ecosystem alongside ostracods and diatoms. These faunal proxies are essential indicators of hydrological shifts reflecting global and regional climate changes. Adding lithological, geochemical, and geochronological (radiocarbon) data, we revealed paleogeographic events of different scales recorded in the sequence of the Rybachya core from the North Caspian Sea. Here, we present the reconstruction of Mangyshlak paleovalley sediments during the Holocene multistage Neocaspian transgression, reflecting global and regional climate changes varying in scale and direction. The determined age of paleovalley-fill sediments, 8070 110 cal yr BP and 7020 140 cal yr BP, suggests that sedimentation processes with extended warming and humidification started later and lasted longer than was assumed earlier. Biological proxies indicate quasi-cyclic variability and shifts from brackish to freshwater conditions throughout the studied interval. Rybachya core was obtained from the early Khvalynian deposits. The Mangyshlak flow formed the depression and eroded the late Khvalynian deposits, which we did not observe in the core structure. It possibly collapsed into paleodepression and acted as a host material for the freshwater lentic faunal association. During the Holocene, we detected a transition from a tranquil water regime to a more dynamic one during the paleovalley gradual filling, followed by marine conditions typical for the modern Caspian Sea.
- Добавил в систему: Ткач Алина Алексеевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | berdnikova2023.pdf | 8,2 МБ | 23 января 2023 [alinaberdnikova] |