Tectonic inversion of the Dnieper-Donets depression and the Donbas (models and reconstructions)

Gonchar, V. V.

doi:10.24028/gzh.0203-3100.v41i5.2019.184444

Cited by 9 publications

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“…The "induction-resonance" model is quite logical. It is based on the data of reconstruction and modeling of tectonic stress fields of DF [Gonchar, 2019]. According to it, tectonic inversion and deformation structure formation within the DDP were caused by resonant deformation processes under the influence of geographically distant inductive tectonic sources.…”

Section: Introductionmentioning

confidence: 99%

Geodynamics

Bartaschuk¹,

Suyarko²

2021

JGD

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The second part of the article studies the tectonic conditions and natural mechanisms of tectonic inversion of the Dnieper-Donets Basin and the Western Donets Graben. Method. The research uses the original method of reconstruction of fields of tectonic stresses and deformations. It also makes tectonophysical analysis of geostructures was used. The analytical base of the research consisted of the latest materials of geo-mapping, numerical modeling of deformations of the southern edge of the Eastern European platform and comparison of model and reconstructed stress fields. Results. In the geodynamic environment of the interference of the intraplate submeridional collision compression with the regional strike-slip stress field, the inversion deformations of the rift-like geostructure took place in the uplift-thrust and strike-slip modes. This led to significant horizontal movements of geomass of sedimentary rocks, deformation folding with the formation of three inversion floors - Late Hercynian (Saal-Pfalz), Early Alpine (Laramian) and Late Alpine (Attic). They formed structural ensembles of scaly tectonic covers of transverse displacement of geomass a from axial to onboard zones, folded covers of longitudinal approach from the Donbas Foldbelt and long linear anti- and synforms, the axes of which are oriented orthogonally to the direction of geomass advancement. Together they form the body of the Segment of Tectonic Wedging of geomass, which is distinguished as part of the Cover-Folded System of Tectonic Thrusting of regional scale. A feature of the tectonic framework of the Segment is the curvature of the planes of the main thrusts, which limit it, and smaller plumage thrusts, which control the folded covers of the thrust. It is associated with a change in the extension of the thrusts from the north-west in the territory of the Western Donets Graben to the western direction in the extreme south-east of the Basin. This causes the corresponding bending of the axes of the fracture anti- and synforms. Structural patterns of folding with a tendency to adapt the axes of folds to the extension of thrusts indicate significant horizontal displacements of geomas of the sedimentary stratum, which in conditions of limited geological space cause secondary deformations of linear folded forms. Due to the displacement of geomas from the zones of maximum compression in the axial part of the Graben to the zones of geodynamic shadow - in the direction of the Oryl depression and Graben boards, the West Donets Cover-Folded Tectonic Region was formed within the transition zone. Scientific novelty. The study completed an original kinematic model of tectonic inversion of the Western Donets Graben was completed. The mechanism of inversion, due to which the riftogenic structure is completely destroyed by folded deformations of platform orogeneses, is caused by the pressure of the "tectonic stamp" of the Donbas Foldbelt. Under its influence, a segment of tectonic wedge was formed in the Graben, which was diagnosed with oroclin of transverse extension of the sliding type. The body of the Oroclin is formed by echeloned, rock-articulated ensembles of anticlinal uplift -folds, synclines and scaly plates-covers of pushing. A geodynamic injection band was formed in the foreland of the Tectonic Orocline extension, where folded zones of geomas displacement were formed, which consist of coulisse articulated uplift-anticlines. At the top of the Orocline, at the ends of dynamically conjugate main thrusts, an advanced tectonic compression fan is formed. In the rear of the Oroclin – hinterland are tectonic sutures – the roots of the folding covers of the approach. Practical significance. Development of a structural-kinematic model of tectonic inversion of the Western Donets Graben will allow to improve the geodynamic model of tectonic inversion of the Dnieper-Donets paleorift, on the basis of which regional schemes of tectonic and oil-gas-geological zoning will be adjusted.

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Section: Introductionmentioning

confidence: 99%

Geodynamics

Bartaschuk¹,

Suyarko²

2021

JGD

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“…2 -ранньорифейського рифтогенеза з розсувом континентальної літосфери і закладанням трогового прогину в тілі Сарматської плити; 3епіконтинентального рифтогенеза в пізньому девоні-карбоні з утворенням недорозвиненого рифту (авлакогена); 4 -пізньогерцинської платформної активізації на тлі синеклізного прогинання рифтогенного басейну з формуванням складчастості ДДЗ і основних лінійних складчастих зон в Донбасі; 5 -кіммерійсько-альпійської інверсії тектонічного режиму з формуванням Донецького складчастого пояса (ДСП) та ускладненням рифтогенної структури ДДЗ колізійними деформаціями [3,4,5,6,7]. Роботами В. Попова, Д. Айзенверга, В. Хаіна, Л. Зоненшайна, С. Субботіна, В. Соллогуба, В. Чекунова, В. Казьміна, Н. Тихонової, В. Корчемагіна, М. Коппа, В. Ємця, В. Дудника, Ю. Рябоштана, С. Стовби, В. Анциферова, О. Гінтова, В. Гончара, С. Горяйнова та ін., які детально досліджували літолого-фаціальні умови осадонакопичення та тектоніку південної околиці СЄП, сформовано загальне уявлення про геодинамічні обстановки седиментаційної та структурної еволюції ДДЗ і Донбасу.…”

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“…За даними кількісного моделювання тектонічної інверсії ДДЗ і Донбасу, земна кора рифтогенної геоструктури ПДДП, розташованої на південній периферії СЄП, являла собою тектонічно ослаблену, внутрішньоплитну, конвергентну зону концентрації міжплитних деформацій [6]. При цьому, тип деформацій визначався характером взаємодії активних літосферних плит на околицях СЄП, а фази орогенезу та зумовлена ними інверсійна складчастість були слідством просторово досить віддалених пізньогерцинських, кіммерій-ських та альпійських колізійних процесів.…”

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“…Зіставлення модельних і реконструйованих полів напруг свідчить, що початок тектонічної інверсії ДДЗ припадає на кінець ранньої перми [6]. Найбільш ймовірно, що деформації рифтогенної структури відбувалися в режимі косої колізії під впливом зустрічних рухів лівосторонньої кінематики північного фронту колізійного орогена, сформованого на активній плиті в межах Палеотетісу (рис.…”

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“…Ааналіз даних реконструкції полів напруг Донбасу [17,24], кількісного моделювання тектонічної інверсії ДДЗ і Донбасу та зіставлення модельних і реконструйованих полів напруг [6] свідчить, що на початковому етапі інверсії тектонічного режиму, на протязі заальської фази пізньогерцинської епохи тектогенеза, деформаційне структуроформування в ДДЗ відбувалося в геодинамічній обстановці косої колізії на тлі інверсійного підйому Донбасу (рис. 2, а).…”

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Tectonic inversion of the Dnieper–Donetsk Basin. Part 2. Geodynamic situations and kinematic mechanism of riftogenic structure deformations

2020

Visnyk of V.N. Karazin Kharkiv National University, Series Geology. Geography. Ecology

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Formulation of the problem. In the second part of the article, the geodynamic mode and the kinematic mechanism of destruction of the Dnieper–Donetsk Basin by tectonic movements of the Late Hercynian and Alpine stages of tectogenesis were studied. New results of tectonophysical studies of the structural–kinematic evolution of the Earth's crust of Dnieper–Donetsk Basin at the collision stage are presented. The subject of research is a complex of deformation structures that complicate the sedimentary cover in the transitional zone of with Donetsk Foldbelt. Review of previous publications and studies. Using instrumental definitions of tectonite vergence, data of reconstruction of stress fields and quantitative modeling of deformations, a original kinematic model of tectonic inversion of the Dnieper–Donetsk Basin was developed. Methods. Structural–kinematic analysis of the structural drawings of collisional deformation and tectonics structures was used for regional geotectonic studies. Results. Tectonic inversion of the Dnieper-Donetsk Basin and Donbass began at the Late Hercynian epoch as a result of collisional movements of the compression orogen on the outskirts of the Paleotethis. Tangential compression of the southwestern direction led to the formation of gentle tectonic faults in the sedimentary cover of the Western Donets Graben, along which a lattice of thrust faults was formed. For a set of extrusion of sedimentary rocks in the reverse–thrust mode from the axial super-compressed zone, tectonic transport of geomas took place in the direction of the zones of "geodynamic shadow" on the southern side. Collisional deformations of horizons by the mechanism of longitudinal bending of the layers caused the formation of linear uplift-folding in the northern part of the Graben, and echelons of scaly thrust covers in the southern. At the Mesozoic and Cenozoic epochs, in the mode of interference of the reverse–thrust and horizontal-strike-slip fields, the Hercynian thrust lattice and the near-fault uplift folds underwent collisional deformation with the formation of coulisse–jointed folded zones and echeloned thrust covers. Based on the kinematic model of tectonic inversion of the Western Donets Graben, the geodynamics of the formation of the transition zone between the Dnieper–Donets Basin and the Donetsk Foldbelt is reconstructed. These data are the basis for adjusting the regional schemes of tectonic and oil and gas geological zoning. Scientific novelty and practical significance. The grouping of the compression axes in the western part of the Donbass caused the formation of a gorst-like geoblock-stamp, under the pressure of which the dislocated geomasses were thrusting onto the syneclisic cover of the southeastern segment of the depression. In the Western Donetsk Graben, the allochthonous stratum formed the body of the tectonic wedging geomas segment. Along the main strike–slip faults, which form the "tectonic rails" of the invasion, geodynamic zones of displacement of geomas were formed, composed of en-echelon articulated upthrust-folds. In its foreland, at the ends of the main strike–slip faults, an advanced scaly compression fan was formed, and in the hinterland, folded sutures were formed on the roots of the thrust covers. The main result of the research is a fundamentally new kinematic model of tectonic inversion of the Dnieper-Donetsk Basin. The model provides that the deformations of the riftogenic structure within the Graben were carried out according to the kinematic mechanism of the formation of a transverse orocline protruding under the pressure of the tectonic geoblock-stamp of the Donetsk Foldbelt.

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Сollision deformations of the Dnieper-Donets Depression. Article 2. Kinematic mechanisms of tectonic inversion

Bartashchuk¹

2019

GGCM

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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.

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Tectonic inversion of the Dnieper-Donets depression and the Donbas (models and reconstructions)

Cited by 9 publications

References 0 publications

Geodynamics

Geodynamics

Tectonic inversion of the Dnieper–Donetsk Basin. Part 2. Geodynamic situations and kinematic mechanism of riftogenic structure deformations

Сollision deformations of the Dnieper-Donets Depression. Article 2. Kinematic mechanisms of tectonic inversion

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