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.

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.

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

A new sedimentary cover model for the southern area of the East European Platform and the Pre-Caucasus based on decompensation gravity anomalies data

2021 ◽  
Author(s):  
Mikhail Kaban ◽  
Alexei Gvishiani ◽  
Roman Sidorov ◽  
Alexei Oshchenko ◽  
Roman Krasnoperov
Keyword(s):  
East European Platform ◽  
Sedimentary Cover ◽  
Gravity Anomalies ◽  
Sedimentary Basins ◽  
The Caucasus ◽  
Near Surface ◽  
New Model ◽  
Origin And Evolution ◽  
East European ◽  
Bouguer Anomalies

<p><span>A new model has been developed for the density and thickness of the sedimentary cover in a vast region at the junction of the southern part of the East European Platform, the Pre-Caucasus and some structures adjacent to the south, including the Caucasus. Structure and density of sedimentary basins was studied by employing the approach based on decompensation of gravity anomalies. Decompensative correction for gravity anomalies reduces the effect of deep masses providing compensation of near-surface density anomalies, in contrast to the conventional isostatic or Bouguer anomalies. . The new model of sediments, which implies their thickness and density, gives a more detailed description of the sedimentary thickness and density and reveals new features which were not or differently imaged by previous studies. It helps in better understanding of the origin and evolution of the basins and provides a background for further detailed geological and geophysical studies of the region.</span></p>

The optical anchor—A geophysical strainmeter

1982 ◽  
Vol 72 (5) ◽  
pp. 1707-1715
Author(s):  
Frand Wyatt ◽  
Kent Beckstrom ◽  
Jon Berger
Keyword(s):  
Shear Strain ◽  
Path Length ◽  
Michelson Interferometer ◽  
Horizontal Displacement ◽  
Earth’S Crust ◽  
Near Surface ◽  
Strain Measurements ◽  
Earth's Crust

abstract An instrument has been developed to monitor the horizontal displacement of near-surface monuments, so as to reduce the noise of observatory-based strain measurements. The device measures the shear strain in the upper 24 m of the earth's crust using an equal path length Michelson interferometer. The magnitude of the observations (∼50 μm) indicates that such measurements are needed to interpret the records produced by precision strainmeters.

scholarly journals Improving of electrical channels for magnetotelluric sounding instrumentation

2015 ◽  
Vol 4 (2) ◽  
pp. 149-154 ◽  
Author(s):  
A. M. Prystai ◽  
V. O. Pronenko
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Deep Structure ◽  
Experimental Tests ◽  
Magnetotelluric Sounding ◽  
Earth’S Crust ◽  
Geomagnetic Variations ◽  
The Earth ◽  
Wide Range ◽  
Earth's Crust

Abstract. The study of the deep structure of the Earth's crust is of great interest for both applied (e.g. mineral exploration) and scientific research. For this the electromagnetic (EM) studies which enable one to construct the distribution of electrical conductivity in the Earth's crust are of great use. The most common method of EM exploration is magnetotelluric sounding (MT). This passive method of research uses a wide range of natural geomagnetic variations as a powerful source of electromagnetic induction in the Earth, producing telluric current variations there. It includes the measurements of variations of natural electric and magnetic fields in orthogonal directions at the surface of the Earth. By this, the measurements of electric fields are much more complicated metrological processes, and, namely, they limit the precision of MT prospecting. This is especially complicated at deep sounding when measurements of long periods are of interest. The increase in the accuracy of the electric field measurement can significantly improve the quality of MT data. Because of this, the development of a new version of an instrument for the measurements of electric fields at MT – both electric field sensors and the electrometer – with higher levels relative to the known instrument parameter level – was initiated. The paper deals with the peculiarities of this development and the results of experimental tests of the new sensors and electrometers included as a unit in the long-period magnetotelluric station LEMI-420 are given.

scholarly journals Deep structure and geodynamic conditions of granitoid magmatism in the Eastern Russia

2020 ◽  
Vol 243 ◽  
pp. 259
Author(s):  
Viktor Alekseev
Keyword(s):  
Deep Structure ◽  
Gravity Anomalies ◽  
Federal District ◽  
Heat Fluxes ◽  
Earth’S Crust ◽  
Granitoid Magmatism ◽  
The Pacific ◽  
Earth's Crust ◽  
Far Eastern ◽  
Eastern Russia

We investigated the deep structure of the lithosphere and the geodynamic conditions of granitoid magmatism in the Eastern Russia within the borders of the Far Eastern Federal District. The relevance of the work is determined by the need to establish the geotectonic and geodynamic conditions of the granitoids petrogenesis and ore genesis in the Russian sector of the Pacific Ore Belt. The purpose of the article is to study the deep structure of the lithosphere and determine the geodynamic conditions of granitoid magmatism in the East of Russia. The author's data on the magmatism of ore regions, regional granitoids correlations, archive and published State Geological Map data, survey mapping, deep seismic sounding of the earth's crust, gravimetric survey, geothermal exploration, and other geophysical data obtained along geotraverses. The magma-controlling concentric geostructures of the region are distinguished and their deep structure is studied. The connection of plume magmatism with deep structures is traced. The chain of concentric geostructures of Eastern Russia controls the trans-regional zone of leucocratization of the earth's crust with a width of more than 1000 km, which includes the Far Eastern zone of Li-F granites. Magmacontrolling concentric geostructures are concentrated in three granitoid provinces: Novosibirsk-Chukotka, Yano-Kolyma, and Sikhote-Alin. The driving force of geodynamic processes and granitoid magmatism was mantle heat fluxes in the reduced zones of the lithospheric slab. The distribution of slab windows along the Pacific mobile belt's strike determines the location of concentric geostructures and the magnitude of granitoid magmatism in the regional provinces. Mantle diapirs are the cores of granitoid ore-magmatic systems. The location of the most important ore regions of the Eastern Russia in concentric geostructures surrounded by annuli of negative gravity anomalies is the most important regional metallogenic pattern reflecting the correlation between ore content and deep structure of the earth's crust.

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