Age constraints for the Zaonega formation of the Ludicovian superhorizon and the Shunga event in the Onega basin: new U-Pb zircon data for the Konchezero sill

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Abstract

New U-Pb data for zircon in the Konchezersky Sill provide robust age constraints for the Suisari Fm in the Onega Basin and constrain the maximum age limit for the sedimentary successions of the Zaonega Fm and the Shunga isotope event.

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About the authors

A. V. Stepanova

Institute of Geology Karelian Research Centre RAS

Author for correspondence.
Email: stepanov@krc.karelia.ru
Russian Federation, Petrozavodsk

A. V. Samsonov

Institute of Geology Karelian Research Centre RAS; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry Russian Academy of Sciences

Email: stepanov@krc.karelia.ru

Corresponding Member of the RAS

Russian Federation, Petrozavodsk; Moscow

A. A. Arzamastsev

Institute of Precambrian Geology and Geochronology Russian Academy of Sciences

Email: stepanov@krc.karelia.ru
Russian Federation, St. Petersburg

A. N. Larionov

A. P. Karpinsky Russian Geological Research Institute

Email: stepanov@krc.karelia.ru
Russian Federation, St. Petersburg

Yu. O. Larionova

Institute of Geology Karelian Research Centre RAS; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry Russian Academy of Sciences

Email: stepanov@krc.karelia.ru
Russian Federation, Petrozavodsk; Moscow

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Supplementary files

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2. Fig. 1. (a) The scheme of the geological structure of the lake area. Concezero (according to [6], with changes). The inset shows a diagram of the tectonic zoning of the Fennoscandian Shield; (b) the position of the Suisar and Zaonezh horizons in the regional stratigraphic scale [3]. Isotopic ages of rocks of the Suisar and Zaonezhsky magmatic complexes: Konchezersk sill – 1988±34 million years (Sm–Nd), 1985±57 million years (Pb–Pb), 1969±18 million years (Re–Os), mineral isochrons [8], Unoy sill – 1970±3 million years, U–Pb ID-TIMS, baddeleyite [17], Koikara-Svyatnavolok sill – 1983±5 million years old, U–Pb, SIMS (SHRIMP-II), zircon [18], Padmozero sill – 2000±4 million years old, U–Pb ID-TIMS, baddeleyite [19].

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3. 2. Variations in the contents of the main scattered elements in rocks and the isotopic composition of Nd in the bulk samples of rocks of the Konchezersk sill, basalts and picrobasalts of the Suisar horizon. Using the data [7, 20].

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4. Fig. 3. (a) cathodeluminescent images of zircons isolated from gabbro-pegmatites of the Konchezersk sill, model Ca-758-2, the point numbers correspond to the numbers in Table 2; (b) micrographs of zircon in the Ca-758-2 slot, the image in back-reflected electrons; (c) the position of the analytical points zircons from the Ca-758-2 sample in the concordia diagram.

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