Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield

Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield

Geodynamic features of the Ukrainian Shield (USh) from Early Precambrian to Phanerozoic have been considered based on tectonophysical analysis of complex geophysical 3D model of the Shield, produced at the Institute of Geophysics of the National Academy of Sciences of Ukraine. In accordance with the...

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Дата:2010
Автори: Gintov, O.B., Pashkevich, I. K.
Формат: Стаття
Мова:rus
Опубліковано: Subbotin Institute of Geophysics of the NAS of Ukraine 2010
Онлайн доступ:https://journals.uran.ua/geofizicheskiy/article/view/117553
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Назва журналу:Geofizicheskiy Zhurnal

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Geofizicheskiy Zhurnal
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spelling journalsuranua-geofizicheskiy-article-1175532020-10-07T10:43:09Z Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield Gintov, O.B. Pashkevich, I. K. Geodynamic features of the Ukrainian Shield (USh) from Early Precambrian to Phanerozoic have been considered based on tectonophysical analysis of complex geophysical 3D model of the Shield, produced at the Institute of Geophysics of the National Academy of Sciences of Ukraine. In accordance with the materials of tectonophysical studies it has been established that fault zones of the USh with initial stages in Neo-Archean and Paleo-Proterozoic were the large shift zones appeared under the action of tangential forces. Kinematics of shift zones was different in the western and eastern megablocks of the Shield that was the basis for conclusion of the absence of connection between its western and eastern parts in Early Precambrian. Tectonophysical materials support the data of paleomagnetism on the clockwise 90 degrees rotation of the Shield together with the East European platform (EEP) as to rotation axis of the Earth during Phanerozoic. Large listric fault zones going to 100 and more km as well as low-angle crust faults which formation accompanied the process of collision of mega-structures of Fennoscandia and Sarmatia were established by deep seismic sounding. The data of seismotomography indicate the lowangle dipping of relatively high-velocity lithosphere of southwestern edge of EEP under relatively low-velocity lithosphere of the adjacent plates. The obtained data testify the fact that the processes of USh crust and mantle formation took place under the action of plate tectonics mechanisms. And it would be overbold at the same time to use the whole set of plate tectonics mechanisms, for example, spreading, formation of oceanic crust, island arches, subduction etc. to the narrow band of the shield as some geologists do. Predominant horizontally shearing type of the most steeply-falling Early Precambrian fault zones of the USh testify the fact that that these zones were transform ones and were formed as a result of the processes of spreading and collision happened outside the Ush. Subbotin Institute of Geophysics of the NAS of Ukraine 2010-04-01 Article Article application/pdf https://journals.uran.ua/geofizicheskiy/article/view/117553 10.24028/gzh.0203-3100.v32i2.2010.117553 Geofizicheskiy Zhurnal; Vol. 32 No. 2 (2010); 3-27 Геофизический журнал; Том 32 № 2 (2010); 3-27 Геофізичний журнал; Том 32 № 2 (2010); 3-27 2524-1052 0203-3100 rus https://journals.uran.ua/geofizicheskiy/article/view/117553/111596 Copyright (c) 2020 Geofizicheskiy Zhurnal https://creativecommons.org/licenses/by/4.0
institution Geofizicheskiy Zhurnal
collection OJS
language rus
format Article
author Gintov, O.B.
Pashkevich, I. K.
spellingShingle Gintov, O.B.
Pashkevich, I. K.
Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield
author_facet Gintov, O.B.
Pashkevich, I. K.
author_sort Gintov, O.B.
title Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield
title_short Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield
title_full Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield
title_fullStr Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield
title_full_unstemmed Tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the Ukrainian Shield
title_sort tectonophysical analysis and geodynamic interpretation of the three-dimensional geophysical model of the ukrainian shield
description Geodynamic features of the Ukrainian Shield (USh) from Early Precambrian to Phanerozoic have been considered based on tectonophysical analysis of complex geophysical 3D model of the Shield, produced at the Institute of Geophysics of the National Academy of Sciences of Ukraine. In accordance with the materials of tectonophysical studies it has been established that fault zones of the USh with initial stages in Neo-Archean and Paleo-Proterozoic were the large shift zones appeared under the action of tangential forces. Kinematics of shift zones was different in the western and eastern megablocks of the Shield that was the basis for conclusion of the absence of connection between its western and eastern parts in Early Precambrian. Tectonophysical materials support the data of paleomagnetism on the clockwise 90 degrees rotation of the Shield together with the East European platform (EEP) as to rotation axis of the Earth during Phanerozoic. Large listric fault zones going to 100 and more km as well as low-angle crust faults which formation accompanied the process of collision of mega-structures of Fennoscandia and Sarmatia were established by deep seismic sounding. The data of seismotomography indicate the lowangle dipping of relatively high-velocity lithosphere of southwestern edge of EEP under relatively low-velocity lithosphere of the adjacent plates. The obtained data testify the fact that the processes of USh crust and mantle formation took place under the action of plate tectonics mechanisms. And it would be overbold at the same time to use the whole set of plate tectonics mechanisms, for example, spreading, formation of oceanic crust, island arches, subduction etc. to the narrow band of the shield as some geologists do. Predominant horizontally shearing type of the most steeply-falling Early Precambrian fault zones of the USh testify the fact that that these zones were transform ones and were formed as a result of the processes of spreading and collision happened outside the Ush.
publisher Subbotin Institute of Geophysics of the NAS of Ukraine
publishDate 2010
url https://journals.uran.ua/geofizicheskiy/article/view/117553
work_keys_str_mv AT gintovob tectonophysicalanalysisandgeodynamicinterpretationofthethreedimensionalgeophysicalmodeloftheukrainianshield
AT pashkevichik tectonophysicalanalysisandgeodynamicinterpretationofthethreedimensionalgeophysicalmodeloftheukrainianshield
first_indexed 2024-04-21T19:41:55Z
last_indexed 2024-04-21T19:41:55Z
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