scholarly journals Analysis of tectonic deformations dynamics on the example of the area of the south-west wing of Kalmius-Toretsk kettle hole

2019 ◽  
Vol 109 ◽  
pp. 00007
Author(s):  
Kostiantyn Bezruchko ◽  
Natalia Diachenko ◽  
Anna Diachenko
Keyword(s):  
Structure Formation ◽  
Deformation Mode ◽  
Mathematical Methods ◽  
Scientific Cognition ◽  
North East ◽  
Kettle Hole ◽  
South West ◽  
Southwestern Area ◽  
Tectonic System ◽  
North Western

The article presents analysis results in the reconstruction of the tectonic conditions dynamics for the formation of local plicative deformations and rupturing under conditions of the research both the macrostructure and its local separation using the example of the southwestern area of Kalmius-Toretska kettle-hole in the Donetsk basin. Authors applied the scientific cognition method, representing a sequence of actions to establish structural links between variables and constant elements of the Investigational tectonic system, based on statistical and mathematical methods of analysis. The characteristics of the anticlinal structure formation in the studied area - fields of the “Butivska” mine were obtained. It was revealed that the initial horizontal attitude of rocks of the studied area was changed by a monoclinal attitude with a north-western dip and a north-east strike. Afterwards, under the conditions of tectonic near latitudinal compression and near meridional tension, anticlinal folding was formed. Then, under the influence of shear fields when the deformation mode was enhanced, a compression duplex was formed within which local echelon folding and fracture was formed - Oktiabrskyi fault #1.

V.—Further Observations on the Margin of the Laxfordian Complex of the Lewisian near Loch Laxford, Sutherland

1962 ◽  
Vol 65 (5) ◽  
pp. 89-106 ◽  
Author(s):  
J. Sutton ◽  
Janet Watson
Keyword(s):  
Structural Pattern ◽  
Regional Variations ◽  
North East ◽  
South West ◽  
North Western

SynopsisThe paper is concerned with one of the marginal parts of the Laxfordian complex of the Lewisian of north-western Scotland where the older Scourian complex (c. 2500 million years) was reactivated during the Laxfordian orogeny (c. 1600 million years). The effects of Laxfordian deformation are discussed with reference to the distortion of Scourian structures and post-Scourian dolerite dykes and to the orientation of newly-developed structures. The arrangement of structures N.E. of the Laxfordian metamorphic front is thought to result from rotation of pre-existing planar elements during compression on north-east-south-west lines, without the development of very large folds. The connection between the style and arrangement of Laxfordian structures and the metamorphic state of the rocks at the time of deformation is illustrated with reference to both local and regional variations, and some implications of the regional changes in the structural pattern are discussed.

scholarly journals XXXIX. The lignites and clays of Bovey Tracey, Devonshire

1862 ◽  
Vol 152 ◽  
pp. 1019-1038 ◽  
Keyword(s):  
Far East ◽  
Left Bank ◽  
The South ◽  
North East ◽  
The North ◽  
South West ◽  
North Eastern ◽  
The Village ◽  
Western Portion ◽  
North Western

The little town or village of Bovey Tracey, in Devonshire, nestles at the foot of Dartmoor, very near its north-eastern extremity; it is situated on the left bank of the river Bovey, about two miles and a half above the point at which it falls into the Teign, and is about eleven miles from each of the towns Exeter, Torquay, and Totnes*,—bearing south-westerly from the first, north-westerly from the second, and northerly from the last. A considerable plain stretches away from it in a south-easterly direction, having a length of six miles from a point about a mile west of Bovey to another nearly as far east of Newton; its greatest breadth, from Chudleigh Bridge on the north-east to Blackpool on the south-west, is four miles. It forms a lake-like expansion of the valleys of the Teign and Bovey rivers, especially the latter, whose course it may be said to follow in the higher part, where it is most fully developed; whilst the Teign constitutes its axis below the junction of the two streams. Its upper, or north-western portion, immediately adjacent to the village, is known as “Bovey Heathfield,” and measures about 700 acres.

scholarly journals PROSPECTS OF THE POTENTIAL FOR OIL AND GAS PRESENCE IN THE NORTH-WESTERN PART OF INNER FLYSH COVERS OF THE UKRAINIAN CARPATHIANS

2019 ◽  
Vol 2 (179) ◽  
pp. 5-27
Author(s):  
Myroslav PAVLYUK ◽  
Volodymyr SHLAPINSKY ◽  
Olesya SAVCHAK ◽  
Myroslav TERNAVSKY
Keyword(s):  
Large Scale ◽  
Oil And Gas ◽  
Gas Composition ◽  
The South ◽  
First Order ◽  
North East ◽  
The North ◽  
South West ◽  
The Given ◽  
North Western

Here the Cretaceous and Paleogene flysh of the Duklya-Chornohora, Burkut, Magura, Marmarosh and Pieniny covers was studied that in the north-western sector of the Ukrainian Carpathians near the border of Poland and Slovakia (Lemkivsky segment) distinguish themselves by very inclined thrusts. Spatially the given tectonic units are within the limits of so called hydrothermal field unfavourable as a whole, as to the presence of hydrocarbons on a large scale here. But there were distinguished small plots with prevalence of hydrocarbons in the gas composition. Prospects of the potential for gas presence in the region should be connected with the areas that spatially gravitate towards Transcarpathian deep. Studied area consists of several tectonic units of the first order. These are covers located farther south-west of Krosno cover: Duklya-Chornohora, Burkut (Porkulets), Magura, Marmarosh and Pieniny covers, in the south-west the studied terrane is limited by the Transcarpathian deep, and farther west – by the state border of Ukraine and Slovakia, in the south-east – by the Rika Rriver, in the north-east – by the zone of joining of Duklya-Chornohora and Krosno covers. Prospects of the potential for oil end gas presence in the given area, as in the Folded Carpathians on the whole, should be determined by the complex of all accompanying parameters: structural, collecting and covering, hadrochemical and geochemical. For the given area of the Carpathians the geochemical factor is the most important.

An Outline of Chinese Geology

1921 ◽  
Vol 58 (8) ◽  
pp. 370-377
Author(s):  
J. S. Lee
Keyword(s):  
Middle Part ◽  
The South ◽  
Glacial Deposit ◽  
North East ◽  
The North ◽  
South West ◽  
Upper Sinian ◽  
Sinian System ◽  
North Western

To the south of the Tsing-ling Range the above classification of the Sinian System no longer holds good. The Kisinling Limestone of western Hu-peh—a massive grey limestone grading downwards into a slaty limestone and slates—has yielded in its upper part gigantic Orthoceras, or the pagoda stone, and other Ordovician fossils; and is therefore regarded as equivalent to the upper and the middle part of the Sinian in north-east China. Unconformably underlying the Kisinling Limestone, a glacial deposit, the Nantou Tillite, was found by Willis and Blackwelder at Nan-tou, near the north-western entrance of the I-chang Gorge (about long. 111° 10′ E., lat. 30° 45′ N.). Mr. V. K. Ting has verbally informed the writer that this interesting deposit extends towards the south-west for a considerable distance. The occurrence of Asaphus and Trinucleus to the south of Ning-kiang (about long. 106° E., lat. 32° 45′ N.) makes it highly probable that, there, the upper Sinian is exposed among other folded Palæozoic strata.

The Metamorphosed Limestones and Associated Contaminated Igneous Rocks of the Carlingford District, Co. Louth

1932 ◽  
Vol 69 (5) ◽  
pp. 209-233 ◽  
Author(s):  
G. D. Osborne
Keyword(s):  
Igneous Rocks ◽  
The South ◽  
Ordnance Survey ◽  
Igneous Complex ◽  
North East ◽  
The North ◽  
South West ◽  
Carboniferous Limestone ◽  
Contamination Effects

THE Carlingford-Barnave district falls within the boundaries of Sheet 71 of the Ordnance Survey of Ireland, and forms part of a broad promontory lying between Carlingford Lough on the north-east and Dundalk Bay on the south-west. The greater part of this promontory is made up of an igneous complex of Tertiary age which has invaded the Silurian slates and quartzites and the Carboniferous Limestone Series. This complex has not yet been investigated in detail, but for the purposes of the present paper certain references to it are necessary, and these are made below. The prevalence of hybrid-relations and contamination-effects between the basic and acid igneous rocks of the region is a very marked feature, and because of this it has been difficult at times to decide which types have been responsible for the various stages of the metamorphism.

scholarly journals Trace element contamination in the mine-affected stream sediments of Oued Rarai in north-western Tunisia: a river basin scale assessment

2021 ◽  
Author(s):  
Jamel Ayari ◽  
Maurizio Barbieri ◽  
Yannick Agnan ◽  
Ahmed Sellami ◽  
Ahmed Braham ◽  
...  
Keyword(s):  
Trace Elements ◽  
Ecological Risk ◽  
Risk Index ◽  
Potential Ecological Risk ◽  
Stream Sediments ◽  
Anthropogenic Sources ◽  
Contamination Level ◽  
North East ◽  
Basin Scale ◽  
North Western

AbstractHigh-quality and accurate environmental investigations are essential for the evaluation of contamination and subsequent decision-making processes. A combination of environmental geochemical indices, multivariate analyses and geographic information system approach was successfully used to assess contamination status and source apportionment of trace elements (Ag, As, Cd, Cr, Cu, Hg, Ni, Pb, Sb, V and Zn) in surface stream sediments from the Oued Rarai basin in north-western Tunisia, containing various metal and metalloid ores. The contamination level reported in this study indicates a non-negligible potential ecological risk, mainly related to sediment transport along the river. Antimony (concentrations ranged from 0.02 to 297 mg kg−1 and Igeo > 5), arsenic (from 0.5 to 1490 mg kg−1 and Igeo > 5), lead (from 2.9 to 5150 mg kg−1 and Igeo > 5) mercury (from 0.05 to 54.4 mg kg−1 and Igeo > 5) and silver (from 0.05 to 9.4 mg kg−1 and Igeo > 5) showed the most crucial contamination. Besides, potential ecological risk index values were maximum for arsenic with a median of 302, indicating a very high to serious ecological risk (> 160). Results from correlation analysis and principal component analysis revealed three main geochemical associations related to lithologic, tectonic and anthropogenic sources. V, Cr and Cu mainly originated from natural bedrock and soil. Ag and Cd were more controlled by both natural and mining enrichments. Mercury and Pb were mostly influenced by the ancient ore-related activities at the Oued Rarai site and north-east–south-west trending faults. Finally, Sb, As, Ni and Zn were largely controlled by the siliciclastic continental Neogene sequences. Finally, the physical and chemical dynamics of the watershed system, lithological properties, mineralisation, tectonic settings and mobilisation of subsurface sediments largely controlled both concentrations and spatial patterns of trace elements in the study basin. These results need to be considered in the strategies of suitable environmental management at former and current mining sites in north-western Tunisia.

Grain Structure Formation Ahead of Tool during Friction Stir Welding of AZ31 Magnesium Alloy

2010 ◽  
Vol 160 ◽  
pp. 313-318 ◽  
Author(s):  
Uceu Suhuddin ◽  
Sergey Mironov ◽  
H. Takahashi ◽  
Yutaka S. Sato ◽  
Hiroyuki Kokawa ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Magnesium Alloy ◽  
Structure Formation ◽  
Material Flow ◽  
Boundary Migration ◽  
Deformation Mode ◽  
Grain Structure ◽  
Az31 Magnesium Alloy ◽  
Structure Evolution ◽  
Friction Stir

The “stop-action” technique was employed to study grain structure evolution during friction-stir welding of AZ31 magnesium alloy. The grain structure formation was found to be mainly governed by the combination of the continuous and discontinuous recrystallization but also involved geometric effect of strain and local grain boundary migration. Orientation measurements showed that the deformation mode was very close to the simple shear associated with the rotating pin and material flow arose mainly from basal slip.

2. Communication relative to the Fresh-Water Limestone of Burdiehouse, near Edinburgh, belonging to the Carboniferous Group of Rocks

1845 ◽  
Vol 1 ◽  
pp. 33-35 ◽  
Author(s):  
Hibbert
Keyword(s):  
Fresh Water ◽  
Marine Origin ◽  
North East ◽  
South West ◽  
Water Origin ◽  
The Common ◽  
Firth Of Forth ◽  
Carboniferous Limestone

In his paper, the author explains that the limestone in question, which is confounded with the common carboniferous or mountain limestone of marine origin, is, in his opinion, of fresh-water origin.On an irregular line extending from Joppa on the coast of the Firth of Forth, in a south and south-west direction to the Pentland Hills, strata of mountain or carboniferous limestone crop out at intervals; and their marine origin is indicated by encrinites, the Productus, &c., and corallines. This limestone is developed with least interruption between Edmonstone and Muirhouse, where it is from twelve to twenty feet thick. At this part of the line may be seen fractures and elevations of the strata of limestone and superincumbent shale and sandstone, evidently occasioned by a sudden and violent uplifting force acting from north-east to south-west, and causing the uplifted strata to dip south-east at an angle of 25°. These uplifted beds, between Edmonstone and Muirhouse, and subsequently to Burdiehouse, form the strata which dip under the coalmeasures of Gilmerton, Loanhead, and other sites.

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