The Kazachi Yerik – Perevoloka section (the Kuban River delta) in the Holocene
https://doi.org/10.55959/MSU0579-9414-5-2022-6-140-148
Abstract
The evolution of a key area of the Kuban River Delta was studied. The core of the borehole KE-21 (18 m in depth) from the southwestern part of the Kuban River Delta (Kazachi Yerik-Perevoloka section) was studied by the complex of methods (lithological and malacological analysis, radiocarbon dating). The KE-21 section contains the Vityazevian-Dzhemetian (>5,0 ka BP) and Nymphean-recent (1,2–0,0 thousand years ago) sediment sequences of alternating lacustrine-lagoonal (dark-colored loams and clays) and alluvial sediments (light sands and sandy clays). The sequences are divided by a period of terrestrial evolution of the area under study during 5,0–1,2 ka BP. The brackish-water lagoons contained mollusk shells from 5 species, such as Cerastoderma glaucum (majority), Mytilus galloprovincialis and Bittium reticulatum (few), Donax trunculus and Tritia reticulata (single). There are no significant differences between each laminae in mollusk shell composition and percentage. The contemporary position of the layers does not reflect the synchronous levels of the Sea of Azov and the Akhtaniz estuary, principally due to local tectonic subsidence and clay shrinkage. The average sedimentation rate over the last 1,2 ka is about 5 mm/year, the max sedimentation rate is 19 mm/year (1860–1911).
Keywords
the Kuban River delta,
Akhtaniz estuaries,
facial analysis,
core drilling,
mollusks,
radiocarbon dating,
paleogeography,
geomorphology
Supporting agencies: Field research and the initial stages of analytical work were financially supported by the Russian Foundation for Basic Research (project 20-35-90067). The authors are sincerely grateful to Prof. T.A. Yanina, the Head of the MSU Laboratory of Recent Deposits and Paleogeography of the Pleistocene, for the help in the organization and carrying out field works. Our gratitude goes to Professor H.A. Arslanov for radiocarbon dating of shell material, as well as to Yu.V. Rymar and the staff of the LLC “GRIS” (Temryuk).
About the Authors
N. A. Tyunin
Lomonosov Moscow State University, Faculty of Geography
Russian Federation
Russian Federation
Department of Geomorphology and Paleogeography, Ph.D. student
V. R. Belyaev
Lomonosov Moscow State University, Faculty of Geography
Russian Federation
Russian Federation
Laboratory of Soil Erosion and Channel Processes, Leading Scientifi c Researcher, Ph.D. in Geography
D. M. Lobacheva
Lomonosov Moscow State University, Faculty of Geography
Russian Federation
Russian Federation
Department of Geomorphology and Paleogeography, Ph.D. student
D. V. Semikolennykh
Institute of Geography of the Russian Academy of Sciences, Laboratory of Evolutionary Geography
Russian Federation
Russian Federation
Ph.D. student
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Review
For citations:
Tyunin N.A., Belyaev V.R., Lobacheva D.M., Semikolennykh D.V. The Kazachi Yerik – Perevoloka section (the Kuban River delta) in the Holocene. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2022;(6):140-148. (In Russ.) https://doi.org/10.55959/MSU0579-9414-5-2022-6-140-148
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