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Rifting in the Paleoproterozoic Onega Basin: geochemistry of volcano-sedimentary rocks of the Zaonega Formation
- Authors: Samsonov A.V.1,2, Stepanova A.V.2, Guschina M.Y.2,3, Silaeva O.M.2,3, Erofeeva K.G.1,2, Ustinova V.V.2, Maksimov O.A.2, Zhdanova L.R.2,4
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Affiliations:
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
- Institute of Geology, Karelian Research Centre, Russian Academy of Sciences
- Geological Institute, Russian Academy of Sciences
- St. Petersburg state university
- Issue: Vol 515, No 2 (2024)
- Pages: 210-220
- Section: GEOCHEMISTRY
- Submitted: 31.01.2025
- Published: 15.10.2024
- URL: https://snv63.ru/2686-7397/article/view/649943
- DOI: https://doi.org/10.31857/S2686739724040052
- ID: 649943
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Abstract
The study of the volcanogenic-sedimentary sequence in the lower part of the Zaonega Formation in the Paleoproterozoic Onega structure (Karelian craton, Fennoscandian Shield) has shown that tuffs and high-silica rocks predominate in its composition. High-silica rocks (SiO2 up to 94 wt. %) are depleted of all elements and probably representing chemogenic siliceous silt. Tuff rocks are close to N-MORB basalts in terms of major element content and rare element distribution character. This association is common to the early stages of continental rifting in the Phanerozoic and may indicate the formation of volcanogenic-sedimentary complexes of the Zaonega Formation in the environment of continental rifting. The mafic rocks in the lower part of the Zaonega Formation are geochemically identical to dolerite dikes and N-MORB-type basalts of 2.10–2.14 Ga age. Their formation was probably related to the same episode of large-scale stretching and thinning of the continental lithosphere of the Karelian craton in the mid–Paleoproterozoic. In this case, the age limit of the Zaonega and underlying Tulomozero Formations should be somewhat older than the 2.06–2.10 Ga interval accepted in modern regional stratigraphic schemes of the Paleoproterozoic of Fennoscandian shield.
About the authors
A. V. Samsonov
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences; Institute of Geology, Karelian Research Centre, Russian Academy of Sciences
Author for correspondence.
Email: samsonovigem@mail.ru
Corresponding member of the RAS
Russian Federation, Moscow; PetrozavodskA. V. Stepanova
Institute of Geology, Karelian Research Centre, Russian Academy of Sciences
Email: samsonovigem@mail.ru
Russian Federation, Petrozavodsk
M. Yu. Guschina
Institute of Geology, Karelian Research Centre, Russian Academy of Sciences; Geological Institute, Russian Academy of Sciences
Email: samsonovigem@mail.ru
Russian Federation, Petrozavodsk; Moscow
O. M. Silaeva
Institute of Geology, Karelian Research Centre, Russian Academy of Sciences; Geological Institute, Russian Academy of Sciences
Email: samsonovigem@mail.ru
Russian Federation, Petrozavodsk; Moscow
K. G. Erofeeva
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences; Institute of Geology, Karelian Research Centre, Russian Academy of Sciences
Email: samsonovigem@mail.ru
Russian Federation, Moscow; Petrozavodsk
V. V. Ustinova
Institute of Geology, Karelian Research Centre, Russian Academy of Sciences
Email: samsonovigem@mail.ru
Russian Federation, Petrozavodsk
O. A. Maksimov
Institute of Geology, Karelian Research Centre, Russian Academy of Sciences
Email: samsonovigem@mail.ru
Russian Federation, Petrozavodsk
L. R. Zhdanova
Institute of Geology, Karelian Research Centre, Russian Academy of Sciences; St. Petersburg state university
Email: samsonovigem@mail.ru
Institute of Earth sciences
Russian Federation, Petrozavodsk; St. PetersburgReferences
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