Transactions of KarRC RAS :: Scientific publications
Transactions of KarRC RAS :: Scientific publications

Transactions of KarRC RAS :: Scientific publications
Karelian Research Centre of RAS
ISSN (print): 1997-3217
ISSN (online): 2312-4504
Transactions of KarRC RAS :: Scientific publications
Background Editorial committee Editorial Office For authors For reviewer Russian version
Transactions of KarRC RAS :: Scientific publications

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SCIENTIFIC PUBLICATIONS
А.В. Степанова, А.В. Самсонов, А.Н. Ларионов.
Заключительный эпизод магматизма Среднего Палеопротерозоя в онежской структуре: данные по долеритам Заонежья
// Труды КарНЦ РАН. No 1. Сер. Геология Докембрия. 2014. C. 3-16
А.V. Stepanova, А.V. Samsonov, А.N. Larionov. The final episode of the middle proterozoic magmatism in the Onega structure: data on Trans-Onega dolerites // Transactions of Karelian Research Centre of Russian Academy of Science. No 1. Precambrian geology Series. 2014. Pp. 3-16
Keywords: Paleoproterozoic Onega structure, Ludicovian, zircons, dolerites.
The results of the study of Paleoproterozoic intrusive rocks from the eastern Zaonezhsky Peninsula are reported. The petrographic and geochemical description of the rocks is presented and the results of the U.Pb dating of the zircons extracted from them are reported. The age of quartz dolerites from the eastern Zaonezhsky Peninsula (Lebeshchina area) is estimated at 1956 ± 5 Ma. The dolerites were shown to be petrogeochemically similar to those of the Onega structure and are probably indicative of a large-scale episode of magmatic activity. The dolerites we dated had less deep sources of generation of the primary melts, above the stability field of garnet, than the preceding Mg.rich Suisari basic rocks. A succession of the processes of melting of the mantle sources that occurred at different depths and at quite close times has been established for the Ludicovian. It presumably reflects one geodynamic event.

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