Home > Archive > No. 4 (181) 2019 > 32-44
Geology & Geochemistry of Combustible Minerals No. 4 (181) 2019, 32-44.
https://doi.org/10.15407/ggcm2019.04.032
Оleksiy BARTASHCHUK
Ukrainian Research Institute of Natural Gases, Kharkov,
e-mail: alekseybart@gmail.сom
Abstract
The second article is devoted to the investigation of the natural mechanisms of tectonic inversion of the Dnieper-Donets depression. Using the materials of geological mapping of the territory of the West-Donetsk graben, structural proofs of the destruction of the riftogenic structure by collision tectonic movements of Hercinian and Alpic tectogenesis were obtained. The consequence of the inversion deformations is the formation of the West Donets cover-folding tectonic region within the Lugansk-Komyshuvasky tectonic area of the uplift-folding and the Kalmius-Toretsky region of the scalloped thrust covers, which are divided by the Main anticline.
For the diagnosis of kinematic mechanisms of tectonic inversion, the data of reconstruction of tectonic stress fields and quantitative modeling of deformations of the southern outskirts of the Eastern European Platform were used. It is assumed that the tectonic inversion of the Dnieper-Donets basin began in the Zaal and Pfalz phases of orogenesis due to the collision motions of the compression orogen at the outskirts of Paleotetis. The formation of linear folding occurred in the uplifting-thrust mode in the field of stresses of the oblique left-hand compression of the sub-meridional directions. The kinematic mechanism of the folded deformations determined the longitudinal bending of the layers due to the extrusion of sedimentary geomas from the zone of maximum compression in the axial part to the zones of “geodynamic shadow” – in the direction of the sides of the depression.
In the late Mesozoic and Cenozoic, uplifting-thrust and strike-slip stresses formed echeloned cover-thrust and coulisse-jointed uplift-folded structural paragenesis. According to the results of tectonophysical diagnostics of deformation structures, it was found that under geodynamic conditions of clustering of compression axes in the central part of the West-Donets graben against the reduction of the geological space horizontally and extension of the section due to the formation of the cover-folded allochthon, there were flexural deformations of the primary linear Hercinian folded forms.
Such data can be considered as a kinematic mechanism of tectonic inversion of the invasion of the “tectonic stamp” by the Donets folded structure. Under its influence, the wedge-shaped segment of the tectonic thrust, which was diagnosed by the orcline of the transverse extension of the shallow type, was formed by the repeatedly deposited folds of sedimentary geomas in the articulation zone between the depression and the folded structure. In the front of the thrusted were formed folded zones of extrusion of geomas, which consist of coulisse-jointed uplift-anticlines and folded plates-coverings of tectonic thrusted. At the apex of the orocline, at the end of the dynamically coupled main thrusts, an advanced tectonic fan of compression is formed. In the rearward of the oraclline formed sutures – the roots of folded cover.
Keywords
tectonic inversion, kinematic mechanism of deformation, plates-coverings of thethrusted, uplift-folds, orocline of lateral extension.
REFERENCES
| Bartashchuk, O. (2019a). Evoliutsiia napruzheno-deformovanoho stanu zemnoi kory Dniprovsko-Donetskoho paleoryftu u fanerozoi [Phanerozoic evolution model of a stressstrain state of the Earth crust at the Dnieper-Donets paleorift]. Dopov. Nac. akad. nauk Ukr., 3, 62-71. [in Ukrainian] https://doi.org/10.15407/dopovidi2019.03.062 |
| Bartashchuk, O. (2019b). Koliziini deformatsii Dniprovsko-Donetskoi zapadyny. Stattia 1. Tektonika zony zchlenuvannia z Donetskoiu skladchastoiu sporudoiu [Сollision deformations of the Dnieper-Donets Depression. Article 1. Tectonics of the articulation zone with the Donets folding structure]. Geology & Geochemistry of Combustible Minerals, 3 (180), 76-89. [in Ukrainian] |
| Dudnik, V., & Korchemagin, V. (2004). Kimmeriyskoye pole napryazheniy v predelakh Olkhovatsko-Volyntsevskoy antiklinali Donbassa. ego svyaz s razryvnymi strukturami i magmatizmom [The Cimmerian stress field within the Olkhovatsko-Volyntsevsky anticline of the Donbass, its relationship with discontinuous structures and magmatism]. Geophysical journal, 26 (4), 75-84. [in Russian] |
| Gonchar, V. (2019). Tektonicheskaya inversiya Dneprovsko-Donetskoy vpadiny i Donbassa (modeli i rekonstruktsii) [Tectonic inversion of the Dnieper-Donets depression and the Donbas (models and reconstructions)]. Geophysical journal, 41 (5), 47-86. [in Russian] https://doi.org/10.24028/gzh.0203-3100.v41i5.2019.184444 |
| Goryaynov, S., & Sklyarenko, Y. (Heads). (2017). Prohnoz lokalizatsii ta hazonosnosti litolohichnykh pastok pivdennoho skhodu DDZ v mezhakh litsenziinykh dilianok HPU «Shebelynkahazvydobuvannia» (Ch. 1. Stvorennia strukturno-heolohichnoi osnovy) [Forecast of localization and gas-bearing capacity of lithological traps in the southeast of DDZ within the licensed sections of GPU “Shebelinkagazvydobuvannya”. (Part 1. Creating a Structural-Geological Basis)]. (Contract N 100 ShGV 2017-2017 (topic N 34.521/2017-2017)). Kharkiv: UkrNDIGaz. [in Ukrainian] |
| Kazmin, V., & Tikhonova, N. (2005). Rannemezozoyskiye okrainnyye morya v Chernomorsko-Kavkazskom regione: paleotektonicheskiye rekonstruktsii [Early Mesozoic marginal seas in Black Sea-Caucasus region: paleotectonic reconstruction]. Geotektonika, 5, 20-35. [in Russian] |
| Kopp, M. (1991). Strukturnyye risunki, svyazannyye s prodolnymi peremeshcheniyami vnutri skladchatykh poyasov (na primere Sredizemnomorsko-Gimalayskogo poyasa) [Structural patterns of within-fold belts horizontal movements]. Geotektonika, 1, 21-36. [in Russian] |
| Kopp, M., Kolesnichenko, A., Mostryukov, A., & Vasilev, N. (2017). Rekonstruktsiya kaynozoyskikh napryazheniy/deformatsiy vostoka Russkoy plity i puti eye primeneniya dlya resheniya regionalnykh i prikladnykh zadach [Reconstruction of Cenozoic stress and deformations in the eastern East European platform with its regional and practical application]. Geodynamics, 2 (23), 46-67. [in Russian] https://doi.org/10.23939/jgd2017.02.046 |
| Kopp, M., & Korchemagin, V. (2010). Kaynozoyskiye polya napryazheniy/deformatsiy Donbassa i ikh veroyatnyye istochniki [The Cenozoic stress/deformation fields of the Donets coal basin and their probable sources]. Geodynamics, 1 (9), 37-49. [in Russian] https://doi.org/10.23939/jgd2010.01.037 |
| Korchemagin, V., & Ryaboshtan, Yu. (1987) Tektonika i polya napryazheniy Donbassa [Tectonics and stress fields of Donbass]. In Polya napryazheniy i deformatsiy v zemnoy kore [Fields of stress and strain in the Earth’s crust] (pp. 164-170). Moscow: Nauka. [in Russian] |
| Rebetskiy, Yu. (2002). Obzor metodov rekonstruktsii tektonicheskikh napryazheniy i prirashcheniy seysmotektonicheskikh deformatsiy [Overview of methods for reconstruction of tectonic stresses and increments of seismotectonic deformations]. In Tektonika segodnya [Tectonics today] (pp. 227-243). Moscow: OIFZ of Academy of Sciences of Russia. [in Russian] |