THE LATE PALEOARCHEAN TONALITE GNEISSES OF WEST-AZOV BLOCK (AZOV MEGABLOCK OF UKRAINIAN SHIELD)
The late paleoarhean (3297±22 Ma) age of tonalite gneisses was at first identified on West-Azov block. They are characterized by a positive value of εNd(3300) = 0,3÷1,8, that they are juvenile source. With the new geochronological data, in the western part of Azov megablock three stages of formation...
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| Date: | 2014 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | Russian |
| Published: |
Institute of Geological Sciences, NAS of Ukraine
2014
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| Subjects: | |
| Online Access: | http://geojournal.igs-nas.org.ua/article/view/139191 |
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| Journal Title: | Geological journal |
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Geological journal| Summary: | The late paleoarhean (3297±22 Ma) age of tonalite gneisses was at first identified on West-Azov block. They are characterized by a positive value of εNd(3300) = 0,3÷1,8, that they are juvenile source. With the new geochronological data, in the western part of Azov megablock three stages of formation of tonalite of ancient crust (3,67±0,05); (3,5±0,005) and (3,3±0,007) Ga was established, during which they formed the nucleus ancient sialic continental crust of Ukrainian Shield, allocated in the Azov and Dniester-Bug megablocks. |
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