Tectonics of the Barents Sea Continental Edge

2021 ◽  
pp. 11-25
Author(s):  
E.V. Shipilov ◽  
◽  
S.I. Shkarubo ◽  
Keyword(s):  
Theoretical Basis ◽  
Barents Sea ◽  
Earth’S Crust ◽  
Geodynamic Evolution ◽  
East European ◽  
The Barents Sea ◽  
Earth's Crust ◽  
Regional Tectonics

The tectonic situation of the studied region was formed as a result of a long (about 3 billion years) evolution of the Earth's crust. The problem of tectonic zoning of the region is not devoted to many published works and cartographic materials. The position of the borders between the East European and West Arctic platforms remains a debatable issue. More ambiguous, and in some cases, approaches to tectonic zoning of the region are not clear. Nevertheless, the work is based on a unified theoretical basis, reflecting the approach to solving the problems of regional tectonics from the perspective of geodynamic evolution.

The latest 3D density model of the Barents Sea crust

2021 ◽  
Author(s):  
David Arutyunyan ◽  
Ivan Lygin ◽  
Kirill Kuznetsov ◽  
Tatiana Sokolova ◽  
Tatiana Shirokova ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Gravity Field ◽  
Barents Sea ◽  
Sedimentary Cover ◽  
Three Dimensional ◽  
Density Model ◽  
Potential Fields ◽  
The Barents Sea ◽  
Moho Boundary ◽  
Earth's Crust

<p>The 3D gravity inversion was realized in order to reveal the density features of the Earth's crust the Barents Sea. The original 3D density model of the region includes both lateral and depth density`s changes.<br>The main steps of the modelling are:</p><p>- The calculation of the anomalies of the gravity field in Bouguer reduction with the three-dimensional gravitational effect correction of the seabed.</p><p>- Gravity field correction for the three-dimensional influence of the Moho boundary (according to the GEMMA model). The excess density at the Moho picked by minimizing the standard (root-mean-square) deviation of the gravity effect from GEMMA Moho boundary and Bouguer anomalies. So, the regional density jump at the Moho border is 0.4 g / cm<sup>3</sup>.</p><p>- Based on regional geological and geophysical data about the deep structure of the Barents Sea, it was developed generalized dependence of density changes by depth in the sedimentary cover and the consolidated part of the earth's crust.</p><p>- Compilation of 3D original model of the base of the sedimentary cover on predictive algorithms of neural networks. The neural network was trained on several reference areas located in different parts Barents area using a number of potential fields transformations and the bottom of the sedimentary cover from model SedThick 2.0.</p><p>- Using the resulted dependence of the crust density change by depth and a new model of the sedimentary cover bottom, the gravitational field corrected for the impact of the sedimentary cover with variable density.</p><p>- The finally stripped gravity field is used to create density model above and below the base of the sedimentary cover. Frequency filtering on Poisson wavelets [Kuznetsov et al., 2020] had been used for the final separation of the gravitational field into its components.</p><p>- The inverse task was solved using specialized volumetric regularization [Chepigo, 2020].</p><p>As a result, the crust of the Barents Sea density inhomogeneities were localized by depth and laterally in 3D model, which became the basis for further structural-tectonic mapping.</p><p>References</p><p>Chepigo L.S. GravInv3D [3D density modeling software]. Patent RF, no. 2020615095, 2020. https://en.gravinv.ru/</p><p>Kuznetsov K.M. and Bulychev A.A. GravMagSpectrum3D [Program for spectral analysis of potential fields]. Patent RF, no. 2020619135, 2020.</p>

Deformations of the deep layers earth’s crust of the East-European platform

2020 ◽  
pp. 25-34
Author(s):  
V. M. Makeev ◽  
N. V. Makarova ◽  
T. V. Sukhanova
Keyword(s):  
East European Platform ◽  
Deep Structure ◽  
Earth’S Crust ◽  
Mantle Lithosphere ◽  
Near Surface ◽  
East European ◽  
Horizontal Stratification ◽  
Deep Layers ◽  
Earth's Crust ◽  
First Time

The article deals with the internal deep structure of the earth's crust of the East European platform and the surface of the mantle lithosphere. The presented charts of the three main layers of the earth's crust — the lower, middle and upper and the surface of the mantle lithosphere — for the first time identified deformation by changing the thickness of the layers. Deformations are compared on all layers that allowed to allot the active center, the main (through) and local (developed in separate layers) areas. The boundaries of these regions are active zones of different ranks. The observed end-to-end development of strain from layer to layer or expression of some of them only in separate layers indicates on the sub-horizontal stratification and vertical divisibility of the earth's crust. Deformations of the deep layers are compared with the latest near-surface platform structures. This made it possible to establish a connection of near-surface deformations with deep ones and to consider the latter as the latest. These studies are relevant for solving fundamental problems of the origin of new structures and a number of practical problems.

Deformation of the Deep Earth’s Crust of the East European Platform

2020 ◽  
Vol 75 (6) ◽  
pp. 568-578
Author(s):  
V. M. Makeev ◽  
N. V. Makarova ◽  
T. V. Sukhanova
Keyword(s):  
East European Platform ◽  
Earth’S Crust ◽  
East European ◽  
Earth's Crust

scholarly journals Deep deformations of the East European platform Earth’s crust: causes and effects

2020 ◽  
Vol 2 (3) ◽  
pp. 57-69
Author(s):  
Vladimir Makeev ◽  
Nataliya Makarova
Keyword(s):  
East European Platform ◽  
Earth’S Crust ◽  
Spatial And Temporal Variability ◽  
Mantle Lithosphere ◽  
Active Centers ◽  
Near Surface ◽  
East European ◽  
Deep Layers ◽  
Earth's Crust ◽  
The Individual

The object of research is the deformation of the deep layers and the Moho surface the East European platform is identified on the basis of structural analysis thickness of the deep layers of the Earth's crust and of the Moho surface. Initial data - geological and geophysical materials of the lithosphere of the East European platform, the thickness of the lower, middle, and upper layers of the Earth's crust, and the newest structures. Research methods are structural-geodynamic and comparative- tectonic, which allow us to assess the spatial and temporal variability of deep and near-surface deformations. Results. Active centers and relatively passive deformations associated are combined into geodynamic regions, the boundaries of which are zones of structural disagreement. Geodynamic regions are divided into main and secondary. The first is expressed by stable and long-term development, the second - is shown in separate layers of the Earth’s crust. It is established that the protrusions of the mantle lithosphere cause a reduction in the thickness of the layers of the Earth's crust and the formation of the newest trough. The sinking of the mantle lithosphere affects the increase in power in the lower and upper layers and the formation of the newest uplifts. The intermediate layer is considered as a compensation layer. Thinning and thick parts of the individual layers lead to the formation of the newest local trough and uplifts. Thus, the conformal and disconform correlation of deformations of deep layers and the newest structures is a characteristic property of the structure of the platform lithosphere. The sources of deep deformations are extra-platform regional areas of recent tectogenesis and intraplatform local active centers - protrusions and trough of the mantle lithosphere, abnormal thickening and thinning of the Earth's crust layers.

Tides in the Earth's Crust

1915 ◽  
Vol 79 (2058supp) ◽  
pp. 382-383
Author(s):  
Alphonse Berget
Keyword(s):  
Earth’S Crust ◽  
Earth's Crust
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