| Title | Geochemical peculiarities and genesis of metaandesites and metadacites of the Novogorovka greenstone structure (Ukrainian Shield) |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Artemenko, GV |
| Abbreviated Key Title | Dopov. Nac. akad. nauk Ukr. |
| DOI | 10.15407/dopovidi2017.04.049 |
| Issue | 4 |
| Section | Geosciences |
| Pagination | 49-54 |
| Date Published | 4/2017 |
| Language | Russian |
| Abstract | Metaandesites of tholeiitic series of parageneration KT-3 of metamorphosed komatiite-tholeiitic formation of Novogorovka GS can be formed as a result of the fractional crystallization of mafic magma from a plume source in the shallow magma chamber (<40 km). They have a low magnesium number (mg# = 0.32). Metadacite located among the rocks of the parageneration of KT-3 were formed in a different magmatic source and are likely more recent. They belong to the calc-alkaline series, are characterized by high magnesium number (mg# = 0.51) and strongly contaminated by a crustal material. Metadacite can be formed by mixing melts of the mafic and silicic compositions or by assimilation of host rocks by basites in a shallow magma chamber (<40 km). |
| Keywords | greenstone structure, komatiite-tholeiitic formation, metaandesite, metadacite, Ukrainian Shield |
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