The 2405 Ma doleritic dykes in the Karelian Craton: A fragment of a Paleoproterozoic large igneous province

New data on the age and composition of doleritic dykes of the Karelian Craton on the Fennoscandian Shield are reported. Based on the results of U–Pb dating of baddeleyite, a new age episode (2404 ± 5 Ma) in the formation of basic rocks on the Karelian Craton is established. Comparison of the composi...

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Bibliographic Details
Published in:Doklady earth sciences 2017, Vol.472 (1), p.72-77
Main Authors: Stepanova, A. V., Salnikova, E. B., Samsonov, A. V., Larionova, Yu. O., Egorova, S. V., Savatenkov, V. M.
Format: Article
Language:English
Subjects:
Cratons
Earth and Environmental Science
Earth Sciences
Geochemistry
Geological time
Igneous rocks
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Summary:New data on the age and composition of doleritic dykes of the Karelian Craton on the Fennoscandian Shield are reported. Based on the results of U–Pb dating of baddeleyite, a new age episode (2404 ± 5 Ma) in the formation of basic rocks on the Karelian Craton is established. Comparison of the composition of the studied dolerite with that of dykes of the same age from other Archean cratons worldwide shows their essential similarity and allows us to suggest their formation within a single large igneous province. The data obtained support the current models of supercontinental reconstructions for the period of 2400 Ma.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X17010196