scholarly journals Collision deformations of the Dnieper-Donets Depression Article 3. Geodynamic model of tectonic inversion

2020 ◽  
Vol 1 (182) ◽  
pp. 40-51
Author(s):  
Оleksiy BARTASHCHUK
Keyword(s):  
Regional Scale ◽  
Original Method ◽  
Donets Basin ◽  
Horizontal Shear ◽  
The South ◽  
The West ◽  
Geodynamic Model ◽  
Late Mesozoic ◽  
South Eastern ◽  
Tectonic Inversion

The article concludes the trilogy on post-strip deformations of the Dnieper-Donets Basin. The results of tectonophysical analysis of collision deformations of the platform cover of the south-eastern part of the Dnieper-Donets Basin are summarized. Using the original method of reconstruction of stress and strain fields and tectonophysical analysis of geostructures, the system organization of inversion structural deformations of the Dnieper-Donets Basin and Donbass was studied. The tectonic inversion of the Dnieper-Donets Basin began in the Late Hercynian epoch in the situation of a general-plate collision under the influence of the inversion rise of the Donbas. Structural and kinematic analysis of deformations shows that the folds in the depression and linear anti- and synforms of the Donets Foldbelt were formed by the natural mechanism of longitudinal bending as a result of collisional warping of horizons in the geodynamic mode of transformation. In the late Mesozoic–­­Cenozoic inversion continued in the field of right-hand horizontal-shear deformations with a variable compressive component. This mode caused the advancing and pushing of sedimentary geomass from the Donets Foldbelt to the Hercynian neo-autochthonous and syneclise autochthonous of the South-Eastern Dnieper-Donets Basin. Due to the influence of the tectonic stamp of the Donets Foldbelt, the West Donets wedge-shaped segment was formed – the orocline of geomass tectonic wedging. Geodynamic bands of injection and displacement of sedimentary geomass were formed in the front of the invasion and in the axial zone of the orocline, where the main folded zones were formed. In Forland, at the ends of the main thrusts – “tectonic rails” of the wedging, an advanced scaly compression fan was formed. In the hinterland of the orocline, folded suture zones are formed by the roots of the covers of thrusting. The original geodynamic model of tectonic inversion provides for the destruction of the riftogenic structure in the Southeast of the Dnieper-Donets Basin by thrusting echelons of scaly covers and coulisses-articulated upliftt-folding. They compose a segment of the insertion of the geomasses of the Paleozoic cover into the territory of the West Donets Graben from the side of the Donets Foldbelt. The intrusion of the tectonic segment led to the formation of an inversion structure of a regional scale – the West Donets Cover-Folded Region.

scholarly journals Сollision deformations of the Dnieper-Donets Depression. Article 1. Tectonics of the articulation zone with the Donets folding structure

2019 ◽  
Vol 3 (180) ◽  
pp. 76-89
Author(s):  
Оleksiy Bartashchuk
Keyword(s):  
Transition Zone ◽  
Sedimentary Cover ◽  
The Body ◽  
Donets Basin ◽  
Tectonic Deformation ◽  
Sedimentary Sequence ◽  
The South ◽  
The West ◽  
South Eastern ◽  
Three Generations

The article is the first part of a trilogy devoted to the study of post-rift deformations of the riftogenic structure of the Dnieper-Donets paleorift. The mechanisms of collision warping of the horizons of the sedimentary cover of the southeastern part of the Dnieper-Donets depression are considered. According to the previous mapping data, the tectonic deformations of the sedimentary cover were controlled by systems of faults of the north, north-west, and south-east vergence. The lattices of tectonites of the Hercynian, Lamaric, and Attic generations determine the specific “cross-thrust” structure of pushing. Overthrusts and linear folding of three generations permeate the sedimentary sequence of the transition zone from east to west for hundreds of kilometers within the eastern part of Izyumsky paleorift segment. The analytical base of the research was the materials of geological mapping of the zone of the junction of the depression with the Donets fold structure. Using field definitions of the tectonite vergency of the Hercynian, Laramide and Attic phases of tectogenesis, the original method of reconstruction of tectonic deformation fields and tectonophysics analysis of structures, collision deformations of the sedimentary cover of the south-eastern part of the Dnieper-Donets paleorift are studied. The tectonophysical analysis of tectonites of different ages indicates that together they control the cover-thrust and folded deformations of the riftogenic structure. Overthrusts and linear reverse-folding of three generations form the West-Donetsk integumentary-folding region, within which a segment of the same name tectonic thrust is distinguished. By pushing the system of repeatedly deformed, crushed into folds of geomass sedimentary rocks on weakly deployed syneclise deposits, the riftogenic structure of the south-eastern part of the basin is completely destroyed. The structural-tectonic framework of the allochthone, pushed from the side of the Donets structure, is composed of dynamically conjugated lattices of Hercynian, Laramide, and Attic tectonites. They control the echelon backstage of linear reverse-folds, tectonic plate-covers of transverse extrusion of sedimentary geomass from axial to airborne zones and folded covers of longitudinal thrust from the south-east. The riftogenic structure of the transition zone between the Dnieper-Donets basin and the Donets folded structure was completely destroyed by deformations of three generations of platform activation. The dynamically coupled tectonite lattice, the overlays, and the folded zones of the Hercynian, Laramide, and Attic generations jointly form the West-Donets fold-fold region within its boundaries. The main tectonic element of the area is the eponymous subregional tectonic thrust segment. The central structural zone is Veliko-Kamyshevakhskaya, Novotroitskaya, Druzhkovsko-Konstantinovskaya and Main anticlines. The central zone divides the body of the segment into two tectonic regions according to the tectonic style and intensity of deformation of the sedimentary sequence. The northern part is occupied by the Luhansk-Kamyshevakhsky region of the rocky-layered linear folding of the thrust, and the southern part is the Kalmius-Toretsky region of scaly tectonic covers.

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

2019 ◽  
Vol 4 (181) ◽  
pp. 32-44
Author(s):  
Оleksiy BARTASHCHUK
Keyword(s):  
Tectonic Stress ◽  
Geological Mapping ◽  
Donets Basin ◽  
The West ◽  
Late Mesozoic ◽  
Left Hand ◽  
Folded Structure ◽  
Tectonic Inversion ◽  
Kinematic Mechanisms ◽  
Kinematic Mechanism

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.

scholarly journals Colisional deformations of the Dnieper-Donets Basin. Part 2. Geodynamic modes and kinematic mechanism of tectonic inversion

2020 ◽  
Vol 15 (4) ◽  
Author(s):  
A.V. Bartashchuk ◽  
Keyword(s):  
Sedimentary Cover ◽  
Kinematic Model ◽  
Strike Slip ◽  
Donets Basin ◽  
Geodynamic Setting ◽  
The West ◽  
Late Mesozoic ◽  
Tectonic Inversion ◽  
Orogenic Uplift ◽  
Kinematic Mechanism

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.

scholarly journals GEODYNAMICS

GEODYNAMICS ◽  
2021 ◽  
Vol 1(30)2021 (1(30)) ◽  
pp. 25-35
Author(s):  
Оleksii Bartaschuk ◽  
◽  
Vasyl Suyarko ◽  
Keyword(s):  
Regional Scale ◽  
Kinematic Model ◽  
Original Method ◽  
Strike Slip ◽  
The Body ◽  
Practical Significance ◽  
Donets Basin ◽  
Transverse Displacement ◽  
North West ◽  
Tectonic Inversion

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.

IV.—On the South-Eastern Coalfield

1899 ◽  
Vol 6 (11) ◽  
pp. 501-505
Author(s):  
W. Boyd Dawkins
Keyword(s):  
British Association ◽  
Total Thickness ◽  
The South ◽  
The West ◽  
South Eastern ◽  
The Rich

The discovery of a coalfield in 1890 at Dover, in a boring at the foot of Shakespeare Cliff, has been already brought before the British Association by the author at Cardiff in 1892, and is so well known that it is unnecessary to enter into details other than the following. The Carboniferous shales and sandstones contain twelve seams of coal, amounting to a total thickness of 23 feet 5 inches. These occur at a depth of 1,100 feet 6 inches below Ordnance datum, and have been penetrated to a depth of 1,064 feet 6 inches, or 2,177 feet 6 inches from the surface. They are identical, as I have shown elsewhere, with the rich and valuable coalfields of Somersetshire on the west, and of France and Belgium on the east

Ritual under Change: Mongolian Influences on Horse Races and Mountain Divinity Worship in Tibet

Inner Asia ◽  
2002 ◽  
Vol 4 (2) ◽  
pp. 361-373
Author(s):  
Elke Studer
Keyword(s):  
Seventeenth Century ◽  
Central Government ◽  
The Political ◽  
The South ◽  
The West ◽  
Horse Race ◽  
Autonomous Region ◽  
South Eastern ◽  
The North ◽  
History Of

AbstractThe article outlines the Mongolian influences on the biggest horse race festival in Nagchu prefecture in the Tibetan Autonomous Region (TAR).Since old times these horse races have been closely linked to the worship of the local mountain deity by the patrilineal nomadic clans of the South-Eastern Changthang, the North Tibetan plain. In the seventeenth century the West Mongol chieftain Güüshi Khan shaped the history of Tibet. To support his political claims, he enlarged the horse race festival's size and scale, and had his troops compete in the different horse race and archery competitions in Nagchu. Since then, the winners of the big race are celebrated side by side with the political achievements and claims of the central government in power.

The dialect of Shahrud (Khalkhāl)

1959 ◽  
Vol 22 (1) ◽  
pp. 52-68 ◽  
Author(s):  
E. Yarshater
Keyword(s):  
Recent Article ◽  
Common Language ◽  
The South ◽  
The West ◽  
Eastern Province ◽  
South Eastern ◽  
The North ◽  
Preliminary Information ◽  
The Common

The object of this paper is to give preliminary information about Shāhrudi, one of the Iranian dialects spoken in Khalkhāl, the south-eastern province of Āzarbāijān lying between the Caspian province of Tālesh to the east, Ardabil to the north, Zanjān to the south, and Miyāna(j) to the west.Our information about the Iranian dialects of Āzarbāijān, where a form of Turkish is the common language, has until recently been very defective. The scanty material available was summed up by Professor W. B. Henning in a recent article. Since then, however, several studies of the current dialects of Āzarbāijān have been published.

scholarly journals DEEP STRUCTURE OF SOUTH-EASTERN PART OF THE WEST SIBIRIAN PLATE AND IN THE SALAIR ACCORDING TO MAGNETOTELLURIC SOUNDINGS

2019 ◽  
Vol 2 (2) ◽  
pp. 80-86
Author(s):  
Elena Pospeeva ◽  
Vladimir Potapov
Keyword(s):  
Electrical Conductivity ◽  
Deep Structure ◽  
The South ◽  
The West ◽  
Geological Structures ◽  
Magnetotelluric Soundings ◽  
South Eastern ◽  
First Results

The first results of magnetotelluric studies carried out on the profile of v. Talmenka – Leninsk-Kuznetsky (South-Eastern part of the West Siberian plate and Salair) are considered, the main features of the distribution of deep electrical conductivity in the two main geological structures of the study area: the South-Eastern part of the West Siberian plate and the Salair zone are shown.

scholarly journals Geological, geochemical and ecological research in the Ilímaussaq region, South Greenland

1978 ◽  
Vol 90 ◽  
pp. 67-73
Author(s):  
J Rose-Hansen ◽  
H Sørensen
Keyword(s):  
Environmental Geochemistry ◽  
Field Work ◽  
Ecological Research ◽  
The South ◽  
The West ◽  
Preliminary Results ◽  
South Eastern ◽  
Diamond Drilling ◽  
Alkaline Intrusion ◽  
Laboratory Investigations

In 1977 field work was concerned with the lujavrites and kakortokites of the south-eastern part of the Ilimaussaq alkaline intrusion (see Andersen & Bohse, this report), pegmatites and veins within the intrusion, the Narssaq intrusion situated to the west of the Ilimaussaq intrusion, and the environmental geochemistry and the ecology of the Narssaq region. Preliminary results of the field work and of some of the laboratory investigations are reported below. It should also be mentioned that a diamond drilling programme was carried out in the uraniferous rocks of the Kvanefjeld area in the northern part of the Ilimaussaq intrusion (see Nyegaard, this report).

scholarly journals Excavations at Theotokou, Thessaly

1907 ◽  
Vol 13 ◽  
pp. 309-327
Author(s):  
A. J. B. Wace ◽  
J. P. Droop
Keyword(s):  
Large Mass ◽  
The South ◽  
The West ◽  
South Eastern ◽  
The North ◽  
Narrow Valley ◽  
North And South

Theotokou lies at the south-eastern corner of the Magnesian peninsula, a little to the north of the bay of Kato Georgi. The site itself is the seaward end of a narrow valley, where a small brook discharges into a little cove just to the north of a hill called Kastro (Fig. 1). Here there stands a small chapel built in 1807, and dedicated to the Virgin. In the walls of the chapel itself are several ancient blocks, and north and south of it traces of walls are visible. Immediately to the west is a large mass of ruins formerly covered with brushwood; round these stand six fragments of Doric columns, and a seventh lies in a cornfield some distance to the west: an eighth, which was seen here, has disappeared. This place, the traditional site of Sepias, was first visited by a local gentleman, Theódoros Zirghános.

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