PRECAMBRIAN METACONGLOMERATES OF THE UKRAINIAN SHIELD – THE MOST IMPORTANT STRATIGRAPHIC MARKERS AND POTENTIAL ORE-BEARING OBJECTS
The data on Precambrian metaconglomerates of the Ukrainian Shield and its slopes are summarized. The stratigraphic position, material composition, lithologic and genetic features, and metal-ore content of metaconglomerates and metaclastic complexes containing them are considered. A comparative chara...
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| Date: | 2025 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | Ukrainian |
| Published: |
Institute of Geological Sciences, NAS of Ukraine
2025
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| Subjects: | |
| Online Access: | http://geojournal.igs-nas.org.ua/article/view/330831 |
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| Journal Title: | Geological journal |
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Geological journal| Summary: | The data on Precambrian metaconglomerates of the Ukrainian Shield and its slopes are summarized. The stratigraphic position, material composition, lithologic and genetic features, and metal-ore content of metaconglomerates and metaclastic complexes containing them are considered. A comparative characterization of the lithological types of metaconglomerates of different stratigraphic levels of the Precambrian of Ukraine is given. A typification of metaconglomerates according to a number of criteria (stratigraphic, material, structural) is proposed for the purposes of historical and geological analysis, metallogenic and prospecting evaluation for some types of minerals, primarily gold, uranium, thorium, and rare earths. Metaconglomerates on the Ukrainian Shield are known from the base of the Paleoproterozoic. Different stratigraphic levels of conglomerate accumulation show characteristic differences in localization and spatial distribution. All levels are specific in terms of the material composition and lithological features of conglomerates, which is the most important correlative criterion in stratigraphic comparisons. Among the Precambrian metasedimentary rocks of the Ukrainian Shield, various lithologic-facies and lithologic-petrographic types inherent in Phanerozoic conglomerates are diagnosed (reconstructed). The absence of tillites among the metaconglomerates is characteristic. A consistent increase in the thickness of psephites and the degree of their polymicticity from the Archean to the Mesoproterozoic is clearly observed. Both the lower and the upper half of the Paleoproterozoic of the Ukrainian Shield are characterized mainly by transgressive sequences of coarse-clastic conglomerate-bearing formations. |
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