On plotting the scheme of fracture-mega-block tectonics of the Ukrainian Shield in a scale 1:500 000
Journal Title: Геофизический журнал - Year 2017, Vol 39, Issue 5
Abstract
The main principles have been proposed for discussion on composing the Scheme of fracrture-mega-block tectonics of the Ukrainian Shield in a scale 1 : 500 000 supported by a decision of Inter-departmental tectonic committee of Ukraine as a basis for plotting the Tectonic map of the Ukrainian Shield in the mentioned scale. The existing maps and schemes of the blocky subdivision of the Ukrainian Shield considerably differ from each other especially because the fact that the unified principles of blocky and especially mega-blocky subdivision for the whole shield were not yet formulated then and the criteria for subdivision and mapping of inter-mega-block fracture zones were not supported. Such criteria are being considered in this work, and examples of schemes of fracture-block tectonics of three sheets in a scale 1 : 200 000 composed on their base have been given. It is proved that the Scheme of fracture-mega-block structure of the Ukrainian Shield must reflect the present-day blocky subdivision of the earth crust formed at the border of Early and Middle Proterozoic, at the very end of establishment of the granite socle of the shield. Only such mega-blocks and blocks and in the first place fault zones, which separate them, may be exactly identified and mapped that is an important condition, because the most part of deposits and ore manifestations of the shield are just related to the fracture zones. More ancient margins of mega-blocks and fault zones in the areas of Early Proterozoic tectonic-magmatic activation are hypothetical and cannot be mapped unambiguously. It has been shown that while plotting the Scheme of fracture-mega-block tectonics of the Ukrainian Shield the priority belongs to geophysical methods.
Authors and Affiliations
O. B. Gintov, V. A. Yentin, S. V. Mychak
Keywords
Related Articles
- EP ID EP243607
- DOI 10.24028/gzh.0203-3100.v39i5.2017.112340
- Views 90
- Downloads 0
Localization of geological objects according to magnetometric data with application of algorithms of automated selection
The method of carrying out quality and quantitative interpretation of basic magnetometric data on the basis of use of analytical approximation of potential fields and some set of derivative highest degrees is offered. In...
Relationship of climate changes with geomagnetic field. P. 3. Northern and Southern hemispheres
Differences of relations between geomagnetic field and climate for Northern and Southern hemispheres considered earlier have been shown. They are connected, first of all, with the depth of penetration of the charged part...
Formation of three-dimensional image of the medium by the sum of CDP for the studies of geological structure of mine fields
Traditionally, seismic observations are carried out by the reflected wave method with multiple overlaps. Thus, the primary result of the processing of such data is the sum of CDP. For further imaging there is necessary t...
Hard-to-recover reserves of Yugra oil (West Siberia)
In 2017, the Yugra’s share of the all-Russian production was 43.0 %, it’s 235.3 million tons in absolute units. This is 3.9 million tons less than in 2016 and 43.1 million less than in 2007. The Neocom shelf sandstones a...
Low-frequency scattering on a half-space filled with periodic fluid-solid medium with dipped layers
A low-frequency effective model has been developed for a medium with periodical liquid and solid layers with the slip between layers. It is shown that for an effective periodically n-layered medium with solid dipped laye...