Geophysical Research Abstracts
Vol. 19, EGU2017-18414, 2017
EGU General Assembly 2017
© Author(s) 2017. CC Attribution 3.0 License.
On the origin of salt in the Caspian Sea
Nikolay Esin (1), Nikolay V. Esin (2), and Valentina Yanko-Hombach (3)
(1) P.P.Shirshov Institute of Oceanology of the Russian Academy of Sciences, Sausern Branch, Gelendzhik, Russian
Federation (esinnik@rambler.ru), (2) P.P.Shirshov Institute of Oceanology of the Russian Academy of Sciences, Sausern
Branch, Gelendzhik, Russian Federation (ovos_oos@mail.ru), (3) I.I.Mechnikov National University, Odessa, Ukraine
(valyan@onu.edu.ua)
A very serious problem associated with the evolution of the Caspian Sea, is the appearance of salt in it with a
chemical composition that is different from the ocean salt (Svitoch, 2014). There are several hypotheses proposed
to explain the specified properties. In each of them states that the salt entered the sea from the Arctic or Indian
oceans or from the Mediterranean Sea, and then it was subsequently reworked by numerous evaporations. But they
do not explain the mechanism of salt accumulation in the Caspian lowlands and its chemical composition changes.
In recent years, our studies have shown that after Paratethys disconnecting from the Mediterranean Sea the trans-
gressions of the Black and Caspian seas occurred as a result of periodic melting of the continental ice. The flow
of water through the mountain range from the Black Sea to the Mediterranean Sea led to the formation of the
Bosphorus Strait. The erosive lowering of the river bed flowing out of the Black Sea is gradually lowered limit of
the possible filling of the seas Paratethys descendants. A mathematical reconstruction of the Sarmatian Sea in cur-
rent relief showed that the theoretical contours of the sea very well coincide with the contours obtained according
to the natural geological research. This shows that over the past ∼ 14 million years the significant changes in the
landscape of the Black Sea-Caspian lowlands in the whole did not happen.
The results allow creating a new understanding of the dynamics of the coasts and seas levels, and the origin of
salt in the Caspian Sea. In our opinion the oceanic salt in the Caspian Sea remained since Paratethys connection
with the Mediterranean Sea. As a result of tectonic processes of the Alps formation there was a gradual separation
of the Paratethys from the Mediterranean Sea. As a result of negative freshwater balance the water in the Caspian
depression evaporated with continuous (some time) inflow of salt water from the ocean. Thus, water evaporated
and salt turned into a evaporites. A similar phenomenon occurred in the Mediterranean Sea at the beginning of the
Messinian Salinity Crisis (Yesin (Esin), 1987). Thus there was the accumulation of salt in the Caspian Sea and in
the lakes of Elton and Baskunchak. Later the continental salt (with continental runoff) accumulated in the Caspian
Sea. And same time there was a gradual periodically washout of salt. In the periods of melting of the continental
glaciations the level of the Caspian Sea rose and there was the salt outflow in the Black Sea, and then into the
Mediterranean Sea.
References
1. Svitoch, A.A. Bol’shoi Kaspii: stroenie i istoriia razvitiia [The Great Caspian Sea: Structure and History].
Moskovskii gosudarstvennyi universitet imeni M.V. Lomonosova [MSU], Moscow, – 2014, – 271 p. (In Russian)
2. Yesin (Esin) N.V., Dmitriyev V.A. On the possible mechanism of formation of the Messinian evaporites in the
Mediterranean Sea // International Geology Review. USA. – DOI:10.1080/00206818709466143. – 1987, – pp.
258-263.