The article presents the results of seismostratigraphic section analysis of the southern part of the Western Precaucasus basin. It showed a widespread development of detachments in the area under study. As a rule, detachments are confined to the boundaries of strata with different rheological behavior and zones with considerably tilted layers at areas adjacent to the Caucasus orogen or, less often, to buried uplifts. Various structures associated with sliding processes along detachments have been identified: asymmetric folds and small overhangs, domino structures and splintering zones. Numerous buried ledges and associated clinoforms have been deciphered on seismic sections of the eastern part of the Western Kuban trough, which can be considered as paleodeltas – accumulative structures of detrital material, transported from north to south into the area of wide shelf of the southern margin of the East European Platform. It is suggested that one of the forms of manifestation of the Greater Caucasus latest orogeny is the tectonic exhumation of the lower layers of the sedimentary cover and complexes of the granite-metamorphic base of the orogen due to the tectono-gravitational collapse of the mountain structure. The detachments are associated with asymmetric folds and thrusts, splintering zones, decompression and compression ramps, which under certain conditions can be traps for hydrocarbons.
References
1. Nikishin A.M., Ershov A.V., Nikishin V.A., Geological history of the Western Caucasus and associated foredeeps based on the analysis of a regional balanced section (In Russ.), Doklady RAN. Nauki o Zemle = Doklady Earth Sciences, 2010, V. 430, no. 4, pp. 515–517.
2. Klavdieva N.V., Tektonicheskoe pogruzhenie kavkazskikh kraevykh progibov v kaynozoe (Tectonic subsidence of the Caucasian marginal troughs in the Cenozoic): thesis of candidate of geological and mineralogical science, Moscow: MSU, 2007.
3. E Beluzhenko E.V., Volkodav I.G., Derkacheva M.G. et al., Oligotsenovye i neogenovye otlozheniya doliny reki Beloy (Adygeya) (Oligocene and Neogene deposits of the Belaya River valley (Adygea)), Maykop: Publ. of ASU, 2007, 110 p.
4. Korsakov C.G., Semenukha I.N., Beluzhenko E.V. et al., Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:200 000 (State geological map of the Russian Federation. Scale 1:200 000), Seriya Kavkazskaya (Caucasian Series). List L – 37 – XXXV. (Maykop). Poyasnitel’naya zapiska (Sheet L – 37 – XXXV. (Maykop). Explanatory note), St. Petersburg: Publ. of VSEGEI, 2004, 301 p.
5. Mollaev Z.Kh., Dotsenko V.V., Bachaeva T.Kh., Kontseptsii formirovaniya Zapadno-Kubanskogo kraevogo progiba (Concepts of the formation of the Western Kuban foredeep), Collective monograph based on the materials of the X All-Russian Scientific and Technical Conference “Sovremennye problemy geologii, geofiziki i geoekologii Severnogo Kavkaza” (Modern problems of geology, geophysics and geoecology of the North Caucasus), Groznyy, 14–16 October 2020, Part 1, Groznyy: Format Publ., 2020, pp. 179-186.
6. Popkov V.I., Bondarenko N.A., Tektonika orogennykh sooruzheniy Severo-Zapadnogo Kavkaza (Tectonics of orogenic structures of the Northwestern Caucasus), Materials of the XLI Tectonic Meeting “Obshchie i regional’nye problemy tektoniki i geodinamiki” (General and regional problems of tectonics and geodynamics), Part 2, Moscow: GEOS Publ., 2008, pp. 125–130.
7. Shempelev A.G., Prutskiy N.I., Fel’dman I.S., Kukhmazov S.U., Geologo-geofizicheskaya model’ po profilyu Tuapse-Armavir (Geological and geophysical model for the Tuapse-Armavir profile), Materials of the XXXIV Tectonic Meeting ”Tektonika neogeya: obshchie i regional’nye aspekty” (Neogean tectonics: general and regional aspects), Part 2, 2001, Moscow, GEOS Publ., 2001, pp. 316-320.
8. Van Baak C.G.C., Krijgsman W., Grothe A. et al., Paratethys response to the Messinian salinity crisis, Earth-Science Reviews, 2017, V. 172, pp. 193-223, DOI: http://doi.org/10.1016/j.earscirev.2017.07.015
9. Palcu D.V., Lazarev S., Krijgsman W. et al., Late Miocene Megalake regressions in Eurasia, Scientific Reports, 2021, V. 11, no. 1, DOI: http://doi.org/10.1038/s41598-021-91001-z
10. Milanovskiy E.E., Noveyshaya tektonika Kavkaza (Recent tectonics of the Caucasus), Moscow: Nedra Publ., 1968, 482 p.
11. Kuznetsov N.B., Romanyuk T.V., Dantsova K.I. et al., On the tectonic nature of the Western Kuban trough (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2023,
no. 9, pp. 78–84, DOI: http://doi.org/10.24887/0028-2448-2023-9-78-84
12. Kolodyazhnyy S.Yu., Makhinya E.I., Shalaeva E.A., Dantsova K.I., Osobennosti pozdneal’piyskoy tektoniki Adygeyskogo sektora Bol’shogo Kavkaza (Features of the Late Alpine tectonics of the Adyghe sector of the Greater Caucasus), Proceedings of All-Russian Conference with international participation “LV Tektonicheskoe soveshchanie. Tektonika i geodinamika Zemnoy kory i mantii: fundamental’nye problemy-2024” (LV Tectonic meeting. Tectonics and geodynamics of the Earth’s crust and mantle: fundamental problems-2024), 2024, V. 1, pp. 202–206.
13. Khain V.E., Tektonika kontinentov i okeanov (god 2000) (Tectonics of continents and oceans (year 2000)), Moscow: Nauchnyy mir Publ., 2001, 606 p.
14. Pfiffner O.A., Thick-skinned and thin-skinned tectonics: A global perspective, Geosciences, 2017, V. 3, no. 7, DOI: http://doi.org/10.3390/geosciences7030071
