Bartashchuk A.V.



Graduated from Kharkov National University (1981), specialization "geological engineer".
PhD in Geological and Mineralogical Sciences, Senior Researcher.
Leading Researcher, Ukrainian Research Institute of Natural Gases (UkrNIIgaz), Kharkov, Ukraine.
Area of scientific interest: geodynamic conditions for the formation of oil and gas structures, patterns of distribution of hydrocarbon deposits.
Author of 55 publications.
Regional petroleum geology
Article # 45_2020 submitted on 07/27/2020 displayed on website on 12/25/2020
19 p.
pdf Colisional deformations of the Dnieper-Donetsk Basin. Part 3. Geodinamic model of tectonic inversion
Based on the results of the structural-kinematic analysis of deformation structures identified in the folded levels of the southeastern segment of the Dnieper-Donets Вasin and the analysis of earlier studies of the mechanisms of inversion structure formation, a fundamentally new geodynamic model of tectonic inversion of the riftogenic structure was developed.
Collisional deformations of the Late Hercynian time in the sedimentary cover of the West Donets Graben occurred in the mode of tangential compression of the riftogenic structure in the southwestern direction. In the regional horizontal shear field, this caused the tectonic transport of geomas from the super-compressed axial zone towards the geodynamic shelters on the southern side of the graben. Linear anti- and syn-forms were formed according to the mechanism of the strata buckling due to collisional warping of the layers. In the Cimmerian and Alpine times, deformations continued in a strike-slip thrust activity with a compression component in the northwestern points. This caused a general transport of geomas from the folded Donbass to the southeastern part of the depression - to the Hercynian neoautochthon and the poorly deployed syneclisic autochthon with the formation of an Alpine nappe-fold thrust system.
The original geodynamic model envisages the complication of the riftogenic structure in the southeast of the basin by echelons of thrust covers and en-echelon articulated near-fault reverse-fold. The kinematic mechanism of the inversion is due to the pressure of the "tectonic stamp" of the Donets Foldbelt, in the front of which a clinoform tectonic segment of geomass wedging was formed, identified by a thrust-type orocline. The "tectonic rails of the invasion" of the orocline were two flank (Northeastern and Southwestern) and axial (Central) linear zones of horizontal shear control. In the foreland of the orocline, geodynamic injection bands of geomas were formed, where linear reverse-fold zones were formed, at the ends of main strike-slip faults, an advanced scaly compression fan was formed. In the hinterland of the orocline, folded suture zones are formed on the roots of the tectonic nappes of the thrust. The structural result of collisional deformations is the formation of an inversion geostructure of a regional scale - the West Donets Nappe-Fold Region.

Keywords: geodynamic model of tectonic inversion, protruding orocline, tectonic stamp of the Donets foldbelt, West Donets Nappe-Fold Region.
article citation Bartashchuk A.V. Kollizionnye deformatsii Dneprovsko-Donetskoy vpadiny. Chast' 3. Geodinamicheskaya model' tektonicheskoy inversii [Colisional deformations of the Dnieper-Donetsk Basin. Part 3. Geodinamic model of tectonic inversion]. Neftegazovaya Geologiya. Teoriya I Praktika, 2020, vol. 15, no. 4, available at: http://www.ngtp.ru/rub/2020/45_2020.html
DOI https://doi.org/10.17353/2070-5379/45_2020
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   Bartashchuk A.V. Kollizionnye deformatsii Dneprovsko-Donetskoy vpadiny. Chast' 2. Geodinamicheskie rezhimy i kinematicheskiy mekhanizm deformatsiy [Colisional deformations of the Dnieper-Donets Basin. Part 2. Geodynamic modes and kinematic mechanism of tectonic inversion]. Neftegazovaya Geologiya. Teoriya I Praktika, 2020, vol. 15, no. 4, available at: http://www.ngtp.ru/rub/2020/35_2020.html. DOI: https://doi.org/10.17353/2070-5379/35_2020
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Regional petroleum geology
Section editor – PhD in geology and mineralogy Makarevich V.N.
Article # 35_2020 submitted on 07/21/2020 displayed on website on 10/22/2020
20 p.
pdf Colisional deformations of the Dnieper-Donets Basin. Part 2. Geodynamic modes and kinematic mechanism of tectonic inversion
The tectonic inversion of the Dnieper-Donets Basin and the Donets Foldbelt began in the Late Hercynian epoch under the influence of collisional movements of the left-sided knematics of the compression orogen on the edge of the Paleotethis. It is shown that as a result of gently inclined disruptions in the Paleozoic platform cover of the West Donets Graben, a thrust lattice was formed, which controlled the processes of collisional buckling of the horizons in the thrust and strike-slip modes. As a result of the displacement of geomasses from the axial zones of maximum compression to the zones of "geodynamic shadow" - in the direction of the Basin borders in the northern and axial parts of the Graben, linear uplift folds were formed, and in the southern - thrust covers.
At the Late Mesozoic and Cenozoic, in the mode of interference of the uplift-thrust and strike-slip fields of the reverse, right-sided kinematics of movements, deformations of the Hercynian thrust lattice and the dynamically conjugated linear near-fault folding took place with the formation of coulisse articulated upthrust-fold zones and en-echelonly overthrust covers. The geodynamic setting of the grouping of the compression axes in the western part of the Donbass, which was experiencing orogenic uplift, caused the thrust of allochthonous geomasses to the syneclise related autochthon of the southeastern segment of the depression. In the West Donets Graben, this caused an increase in the section beyond the Hercynian Neoautochthon and the Cimmerian-Alpine allochthon with the formation of a clinoform wedging Segment. Along the main strike-slip faults, which form the tectonic rails of its invasion, geodynamic zones of geomass squeezing out, formed by curvilinear, en-echelonly upthrow folds, were formed. In the foreland of the Segment, at the ends of dynamically coupled thrust and strike-slip faults, a forward compression fan is formed; in the hinterland, on the roots of thrust covers, folded suture zones are formed.
Based on the results of the kinematic analysis of the Hercynian and Alpine deformation structures, a new kinematic model of the tectonic inversion of the riftogenic structure of the Southeastern Segment of the Dnieper-Donets Basin has been developed. In accordance with it, the deformations of the sedimentary cover of the West Donets Graben were carried out according to the kinematic mechanism of a transverse orocline of pushing geomasses of the sub-thrust type, under the pressure of the tectonic stamp of the Donets Foldbelt.

Keywords: geodynamic modes, kinematic deformation mechanism, wedging segment, forward compression fan, folded sutures, thrusting orocline, tectonic stamp, Dnieper-Donets Basin.
article citation Bartashchuk A.V. Kollizionnye deformatsii Dneprovsko-Donetskoy vpadiny. Chast' 2. Geodinamicheskie rezhimy i kinematicheskiy mekhanizm deformatsiy [Colisional deformations of the Dnieper-Donets Basin. Part 2. Geodynamic modes and kinematic mechanism of tectonic inversion]. Neftegazovaya Geologiya. Teoriya I Praktika, 2020, vol. 15, no. 4, available at: http://www.ngtp.ru/rub/2020/35_2020.html
DOI https://doi.org/10.17353/2070-5379/35_2020
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Regional petroleum geology
Section editor – PhD in geology and mineralogy Makarevich V.N.
Article # 28_2020 submitted on 07/15/2020 displayed on website on 08/31/2020
19 p.
pdf Collisional deformations of the Dnieper-Donets Basin. Part 1. Tectonics of the Western-Donetsk Graben
On the basis of the latest materials of geological mapping of dislocation complexes of the platform sedimentary cover, deformations of the riftogenic structure of the southeastern segment of the Dnieper-Donets Basin and the zone of its junction with the Donets Foldbelt were studied. Using the structural analysis of tectonite patterns of the Paleozoic complex of the West Donets Graben, taking into account the field definitions of the directions of tectonic movements along them, an attempt was made to identify the tectonic style and the systemic organization of collisional deformations. It is shown that fold deformations are in three structural levels identified in the Paleozoic graben cover - Hercynian, Laramian, and Attic, were controlled by thrust faults and uplift faults of the northern, northwestern, and southeastern strike azimuths with a significant component of horizontal displacements. A feature of inversion tectonics is the formation of dynamically conjugated lattices of thrusts and uplifts of the Late Hercynian and Alpine (Laramian and Attic phases) stages of tectogenesis, which control echeloned cover-thrust dislocations and linear, coulisse articulated uplift-folded.
The set of deformation structures and tectonite lattices controlling them is for the first time distinguished into a regional system of tectonic thrusting structures of repeatedly dislocated geomasses of sedimentary rocks from the southeast, from the Donets Foldbelt, to the northwest - onto the weakly dislocated syneclises like cover of the basin. The main structural element of the cover- folded system that determines the inversion tectonic style is the clinoform segment of tectonic wedging of geomasses. Its northeastern flank is formed by linear folded zones of open Paleozoic structures - Torsko-Drobishivskaya, North-Donets, Matrossko-Toshkovskaya, and the southwestern - by echelons of scaly folded covers. The axis of the segment is formed by the coulisse-articulated Petrovsko-Novotroitskaya, Velikokamyshevakhskaya, Druzhkovsko-Kostantinovskaya and Main uplift-anticlines.
The analysis of the systemic organization of collisional deformations made it possible to conclude that the riftogenic structure of the southeastern segment of the Dnieper-Donets Basin was destroyed at the inversion stages of structural evolution with the formation of the West Donets Cover-Folded Region. According to the style and intensity of deformations in its northern part, the Luhansk-Kamyshevakhsky Area of coulisse-articulated uplift-folding is distinguished, in the south - the Kalmius-Toretsky Area of scaly thrust covers.

Keywords: lattice of thrusts and uplifts faults, echelon of scaly thrust covers, coulisse-articulated uplift-folding, West Donets Cover-Folded Region.
article citation Bartashchuk A.V. Kollizionnye deformatsii Dneprovsko-Donetskoy vpadiny. Chast' 1. Tektonika Zapadno-Donetskogo grabena [Collisional deformations of the Dnieper-Donets Basin. Part 1. Tectonics of the Western-Donetsk Graben]. Neftegazovaya Geologiya. Teoriya I Praktika, 2020, vol. 15, no. 3, available at: http://www.ngtp.ru/rub/2020/28_2020.html
DOI https://doi.org/10.17353/2070-5379/28_2020
References
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