| Autor: |
Степанюк, Л. М., Довбуш, Т. І., Павлов, Г. Г., Висоцький, О. Б., Ковтун, О. В., Коваленко, Н. О. |
| Zdroj: |
Mineralogicheskiya Zhurnal; 2024, Vol. 46 Issue 3, p55-65, 11p |
| Abstrakt: |
The Petrivsky iron ore deposit is located on the left bank of the Ingulets River, southeast of the village Petrovo, Oleksandriysky district, Kirovohrad region. Until recently, the deposit was developed of the quarry method. The quarry revealed an iron ore stratum composed of ferruginous quartzites and crystalline schists, and strongly schis-tulated gneisses, ore-free quartzites and carbonate rocks occur in sharply subordinate quantities. In some areas of the quarry, the crystalline slates are partially migmatized, and the bundles of ferruginous quartzite are in many places dissected by veins of aplito-pegmatoid granites and pegmatites. According to the nature of the section, the iron ore stratum belongs to the Artemivska suite of the Ingulo-Ingulets series. Optical microscopy methods revealed heterogeneous cores of relict (clastogenic) zircon within the accessory zircon crystals from gneiss, which made it possible to make an assumption about its primary sedimentary nature, and rather high isotopic ratio 87Sr/86Sr = 0.70914 ± 0.00005 in calcite from calciphyre indicates on sediment accumulation in a basin isolated from the world ocean According to the results of uranium-lead isotope dating of different-grained monazite samples (TIMS method), the granites dissect the iron ore stratum of the Petrivske deposit were rooted in the Paleoproterozoic: aplito-pegmatoid granite 2033.3 ± 2.3 million years ago and plagiopegmatite — 2028.5 ± 5.6 million oyears ago. It is proposed to take the age of 2030 million years as the upper age limit of the iron ore stratum. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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