On some aspects of the study of age ratios of rock complexes of the Ukrainian Shield
The article discusses the applicability of stratigraphic dismemberment in the study of high-temperature metamorphic complexes of the Ukrainian Shield. The effectiveness of the stratigraphic method with respect to these complexes was called into question in a recent collective publication [Ponomarenk...
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| Date: | 2020 |
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| Main Author: | |
| Format: | Article |
| Language: | Russian |
| Published: |
S. Subbotin Institute of Geophysics of the NAS of Ukraine
2020
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| Subjects: | |
| Online Access: | https://journals.uran.ua/geofizicheskiy/article/view/201745 |
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| Journal Title: | Geofizicheskiy Zhurnal |
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Geofizicheskiy Zhurnal| Summary: | The article discusses the applicability of stratigraphic dismemberment in the study of high-temperature metamorphic complexes of the Ukrainian Shield. The effectiveness of the stratigraphic method with respect to these complexes was called into question in a recent collective publication [Ponomarenko et al., 2018]. According to the authors of the article, this is due to the impossibility of restoring the primary layering in them and the imposed intensive tectonic and intrusive-metasomatic processing of the complexes. At the same time, the authors express an opinion on the problematic appearance of the deformation structure of the granulite complexes of the Ukrainian Shield as a result of folding of general compression, and also deny the existence of large folded structures ― anticlinoria and synclinoria ― in the areas of distribution of the complexes. These conclusions are made on the example of the zelenolevadov and salkov suits of the Bug Area complex, which the authors propose to exclude from the stratigraphic scheme the Precambrian of the Ukrainian Shield. In this article, based on studies of the same stratigraphic units, it is shown that the sheet structure of the salkov suite is of primary stratigenic origin. The superimposed intrusive and metasomatic processes are limited and cannot significantly change the composition and inherited layering of the suite. The author's ideas about the regional structure of the Bug Area complex, which is a large synclinorium, and about the place in this structure of the zelenolevadov and salkov suite are presented. Examples of large folded structures on the area of development of the Azov granulite complex are given. It is concluded that the structural-stratigraphic and historical-geological methods of dismemberment the Lower Precambrian were and remain the only reliable basis for studying the most ancient geological formations of the Earth. Isotope-geochronological, tectonophysical and other data should be consistent with the results of these studies. |
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