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The history of the Greater Caspian: the Pleistocene (Quaternary) basinsстатья
- Автор: Svitoch A.A.
- Журнал: Stratigraphy and sedimentology of oil-gas basins
- Номер: 2
- Год издания: 2013
- Первая страница: 3
- Последняя страница: 36
- Аннотация: In this article, we will consider the Pleistocene history of the Greater Caspian as a system of water pools that were located in lieu of the modern sea and the lowlands that surround it today. Differently from the Late Pliocene transgressions, the Pleistocene history of the Caspian has the more characteristic sharp different scale level fluctuations caused by the presence of a distinct hierarchic structure consisting of a series of major transgressions, namely, the Baku, the Khazar, the Khvalyn and the New Caspian ones, which were separated by the Turkan, the Synghil, the Atel and the Manghishlak regressions. At the maximum transgression, the level of the Caspian rose to 40–50 m abs alt, while it dropped to -100 m and below in the regressive epochs. The facies composition of deposits in the transgressive ages was quite diverse and the deposits are characterised by the original complexes of the Didacna genus molluscs. In their major features, all the main transgressions matched the climatic cooling ages in the Russian Plain, while the minor transgressions (the Urunjik, the Late Khazar and the New Caspian ones) coincided with the climatic warming ages. The Pleistocene Basins of the Caspian correspond to the last (the Quaternary) period of the basin’s development and consist of a series of sub-stages: the Baku, the Khazar, the Khvalyn and the New Caspian ones, each of these being represented by the transgressive stages and separated by the Turkan, the Synghil, the Chernoyar, the Atel and the Manghishlak regressions. Differently from the Pliocene history, there is a vast documentary reference on the Quaternary that provides for a more detailed and particular reconstruction of the Caspian Sea Pleistocene evolution.
- Добавил в систему: Свиточ Александр Адамович