Neotectonics and Geological Structure of the Sevan Intermountain Basin (Armenia): New Structural and Paleontological Data

E. A. Shalaeva; Шалаева Е. А.; V. G. Trifonov; Трифонов В. Г.; Ya. I. Trikhunkov; Трихунков Я. И.; V. V. Titov; Титов В. В.; A. V. Avagyan; Авагян А. В.; L. H. Sahakyan; Саакян Л. Г.; A. N. Simakova; Симакова А. Н.; P. D. Frolov; Фролов П. Д.; C. A. Sokolov; Соколов С. А.; M. A. Vasiliyeva; Васильева М. А.; D. M. Bachmanov; Бачманов Д. М.; G. M. Ovakymyan; Овакимян Г. М.

doi:10.31857/S0016853X23020078

Neotectonics and Geological Structure of the Sevan Intermountain Basin (Armenia): New Structural and Paleontological Data

Authors: Shalaeva E.A.¹, Trifonov V.G.¹, Trikhunkov Y.I.¹, Titov V.V.², Avagyan A.V.³, Sahakyan L.H.³, Simakova A.N.¹, Frolov P.D.¹, Sokolov C.A.¹, Vasiliyeva M.A.¹, Bachmanov D.M.¹, Ovakymyan G.M.³
Affiliations:
1. Geological Institute, Russian Academy of Sciences
2. Institute of Geological Sciences, National Academy of Sciences of Armenia
3. South Scientific Center, Russian Academy of Sciences
Issue: No 4 (2023)
Pages: 103-117
Section: Articles
URL: https://journals.rcsi.science/0016-853X/article/view/134775
DOI: https://doi.org/10.31857/S0016853X23020078
EDN: https://elibrary.ru/FZNLMC
ID: 134775

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Abstract

The article presents new data obtained as a result of field research in 2022 Sevan intermountain depression in Armenia. The emergence of the Sevan intermountain depression in the Miocene was associated with the development of the Sevan almond-shaped structure, bounded by the right-lateral Pambak‒Sevan‒Syunik fault zone in the northeast, the Garni zone in the south, and the Arpa‒Zangezur zone in the southwest. Within the Sevan almond-shaped structure, strike-slip structures of Small Sevan (western part of Lake Sevan) and Gavar almond-shaped structure, Gavar horst, a number of faults, as well as extension zones were formed, including the southern part of Greater Sevan (eastern part of Lake Sevan) and axial zone of the Geghama Range. The development of the Sevan intermountain depression continued in the Pliocene under the influence of the uplift of the Lesser Caucasus and the Armenian Highlands. We have summarized the available data on the geological structure and geodynamics of the Sevan intermountain depression, presented the obtained data on the stratigraphy of the Pliocene–Quaternary deposits and their position, and showed that during the Akchagyl transgression at the Pliocene–Pleistocene boundary, sedimentary accumulations did not occur in the Sevan intermountain depression.

Keywords

Armenian highlands, intermountain depression, active faults, Akchagyl transgression, lacustrine sediments, Pleistocene fauna

References

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