U-Pb ID-TIMS age of the Tiksheozero carbonatite: expression of 2.0 Ga alkaline magmatism in Karelia, Russia

• Published in: Open Geosciences
• Main Authors: Corfu, Fernando, Bayanova, Tamara, Shchiptsov, Vladimir, Frantz, Natalia
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Walter de Gruyter GmbH 2011
• Subjects: General Earth and Planetary Sciences; Environmental Science (miscellaneous); karelia*
• Online Access: http://dx.doi.org/10.2478/s13533-011-0029-z; http://link.springer.com/content/pdf/10.2478/s13533-011-0029-z.pdf; http://link.springer.com/article/10.2478/s13533-011-0029-z/fulltext.html; http://link.springer.com/content/pdf/10.2478/s13533-011-0029-z

Abstract The Tiksheozero carbonatite in northern Russian Karelia is a transitional type between alkaline ultramafic — carbonatitic and alkaline gabbroic suites. The complex is dominated by pyroxenite with a variety of subordinate mafic and ultramafic phases and nepheline syenite. Carbonatite occurs in a main central body and in veins. In this study we have obtained a reliable age for the complex by single grain ID-TIMS U-Pb analyses of zircon and baddeleyite. The age of 1999 ± 5 Ma is important because it places the emplacement of the alkaline complexes in the context of craton-wide extension and break-up events which preceded the initiation of a major Paleoproterozoic orogenic cycle. The Paleoproterozoic age also emphasizes the fact that not all members of the Kola alkaline province are of Paleozoic age.