The Relationships of the Dislocations of the Basement and Sedimentary Cover with the Newest Structural Plan of the West Siberian Plate

The seismoacoustical investigations was made in the western part of the Kerch strait (Azov sea) near Kamysh-Burun spit. The fracture zone with dislocated sedimentary rocks layers and buried erosional surface was revealed to the west of spit. Three seismofacial units was revealed to the east of spit. The first unit was modern sedimentary cover. The second ones has cross-bedding features and was, probably, the part of early generation of Kamysh-Burun spit, which lied to the east of its modern position. The lower border of the second unit is the erosional surface supposed of phanagorian age. The third unit is screened by acoustic shedows in large part.

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Remarques tectoniques sur les environs de Morteau (Doubs)

BSGF - Earth Sciences Bulletin ◽

10.2113/gssgfbull.s5-xix.1-3.85 ◽

1949 ◽

Vol S5-XIX (1-3) ◽

pp. 85-88

Author(s):

A. Perrodon

Keyword(s):

Sedimentary Cover ◽

The West ◽

Asymmetric Structures

Abstract The Morteau syncline, Doubs, France, is bounded on the west by the Tantillon anticline. Both are asymmetric structures. Overturning of the west flank of the syncline and formation of pinched structures are attributed to post-tectonic adjustments and sliding by gravity of plastic Neocomian (Cretaceous) beds and rigid Malm (Jurassic) blocks of the sedimentary cover.

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Mineralogical and geochemical features of volcanics from the pre-Jurassic basement of the western part of Yamal

News of the Ural State Mining University ◽

10.21440/2307-2091-2020-4-103-114 ◽

2020 ◽

pp. 103-114

Author(s):

Vladimir Sergeevich PONOMAREV ◽

◽

Yuriy Viktorovich EROKHIN ◽

Kirill Svyatoslavich IVANOV ◽

Nadezhda Nikolaevna FARRAKHOVA ◽

...

Keyword(s):

Oil And Gas ◽

Sedimentary Cover ◽

Geological Structure ◽

Island Arc ◽

Lead Chloride ◽

The Arctic ◽

Yamal Peninsula ◽

The West ◽

Metasomatic Process ◽

The Yamal Peninsula

Relevance of the work. The Arctic part of the West Siberian megabasin is the main source of oil and gas in Russia, therefore, the study of the geological structure of this region is extremely important. Recently, Russia has lodged an application to extend its territory in the Arctic Ocean along the ridges that stretch from the continental shelf. Unfortunately, at the same time, we know little about the geological structure of the Arctic in the region of Western Siberia, where the thickness of the sedimentary cover is very high (about 3–4 km), therefore, the study of the basement of the Yamal Peninsula seems to be extremely urgent. The purpose of this work is mineralogical, petrological and geochemical study of dolerites from the pre-Jurassic basement of the Bovanenkovskaya area (well No. 114) within the territory of the gas condensate field of the same name, located in the western part of the Yamal Peninsula. Scope of the work. This work can be useful in constructing geological maps of the pre-Jurassic basement of the Yamal Peninsula. Results and conclusions. We have studied the mineralogical and geochemical features of dolerites from the pre-Jurassic basement of the Bovanenkovskaya area (well No. 114, sampling depth – 3210 m) of the West Siberian megabasin. The mineralogy of the rocks is represented by augite, diopside, albite, magnesian chamosite, ferrous hornblende, calcite, siderite, dolomite, anorthoclase, grossular, zeolite (gmelenite-K), pyrite, chalcopyrite, and rare lead chloride – cotunnite. The rocks underwent minor transformations in the conditions of the lower greenschist metamorphism, as well as secondary alterations in the form of superimposed propylitization. As a result of this low-temperature metasomatic process, zeolite, carbonate (calcite, dolomite, and siderite) and sulfide mineralization composed of pyrite and chalcopyrite, as well as cotunnite, which apparently replaced the dissemination of galena, were formed in the rock. Judging by geological position of the region, these dolerites are most likely formed at shallow depths during continental rifting. Remelting of the Paleozoic island arc substrate during the Early Triassic rifting and volcanism provided some closeness to the island arc trend in the geochemical features of these rift volcanics.

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Precisions sur les deformations tectoniques dans le S du dome de la Mure (Isere)

BSGF - Earth Sciences Bulletin ◽

10.2113/gssgfbull.s6-vii.4-5.475 ◽

1957 ◽

Vol S6-VII (4-5) ◽

pp. 475-487

Author(s):

Jean Sarrot-Reynauld

Keyword(s):

Sedimentary Cover ◽

Tectonic Unit ◽

The West

Abstract Following an outline of the different tectonic phases that have affected the Variscan range and discussion of the relations between the La Mure dome (Isere, France) and other crystalline massifs of the region, a series of sections is described which shows the details of folding in the sedimentary cover. The Seneppy massif bordering the dome on the west is shown to be autochthonous (as is the Connexe to the east); together with the dome it forms a tectonic unit with regard to both style and origin.

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Sur la constitution geologique de la region du Vohibory (Madagascar)

BSGF - Earth Sciences Bulletin ◽

10.2113/gssgfbull.s6-vi.1-3.151 ◽

1956 ◽

Vol S6-VI (1-3) ◽

pp. 151-156

Author(s):

Jacques Boulanger

Keyword(s):

Sedimentary Cover ◽

Crystalline Basement ◽

The West ◽

Petrographic Study

Abstract In the Vohibory region, southern Madagascar, the peneplaned crystalline basement outcrops on the east, the sedimentary cover on the west. The basement is composed of Precambrian paragneissic rocks, in which a basal amphibolitic complex (the Androyen series in the east and the Vohiboryen series in the west) can be distinguished, and the unconformably overlying Ampanihyen series. Petrographic study shows distinct petrochemical differences between the series, confirming the stratigraphic and structural evidence of the unconformity.

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The Latest Structural Plan of the West Siberian Plate

Moscow University Geology Bulletin ◽

10.3103/s014587522102006x ◽

2021 ◽

Vol 76 (2) ◽

pp. 129-135

Author(s):

E. A. Manuilova

Keyword(s):

The West ◽

Structural Plan

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Thermal conductivity of the sedimentary-cover rocks of the West Siberian Plate in relation to their humidity and porosity

Russian Geology and Geophysics ◽

10.1016/j.rgg.2014.05.021 ◽

2014 ◽

Vol 55 (5-6) ◽

pp. 784-792 ◽

Cited By ~ 15

Author(s):

A.D. Duchkov ◽

L.S. Sokolova ◽

S.V. Rodyakin ◽

P.S. Chernysh

Keyword(s):

Thermal Conductivity ◽

Sedimentary Cover ◽

The West

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

Geology and Geochemistry of Combustible Minerals ◽

10.15407/ggcm2019.03.076 ◽

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.

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