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Lower Proterozoic orthorocks in the Svecofennides of the Savo belt (Western Ladoga Region): Geochemical properties

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Abstract

On the basis of petrochemical data, orthorocks are defined among highly metamorphosed sequences of the Landenpokh’ya Group attributed to the Kalevian and Svecofennian systems in the Ladoga region. The contents of major and trace elements in orthorocks, which constitute some volcanogenic sedimentary complexes in the western Ladoga region, are discussed. The volcanics of the first complex (Kukhka Island area) belong to the calc-alkaline series and are characterized by the presence of OIB-type basaltic andesites. The basites of the second complex (Kil’pola Island area) are attributed to the tuffaceous rocks of the WPB-type tholeiitic series. The volcanics of the third complex (Kuznechnoe-Khiitola area) are largely represented by dacites referred to the Svecofennian mature island arc. The presented geological and geochemical data imply that the first and second complexes, which include intraplate volcanics, could be formed on the basite Jatulian-Ludikovian basement (protolith). These Kalevian rocks of the western Ladoga region are correlated with the volcanogenic sedimentary complexes in the southern part of the Savo belt in Finland and belong to the Karelian province.

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  1. Institute of Precambrian Geology and Geochronology (IGGD), Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    L. N. Kotova & V. N. Podkovyrov

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Original Russian Text © L.N. Kotova, V.N. Podkovyrov, 2014, published in Stratigrafiya. Geologicheskaya Korrelyatsiya, 2014, Vol. 22, No. 5, pp. 3–21.

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Kotova, L.N., Podkovyrov, V.N. Lower Proterozoic orthorocks in the Svecofennides of the Savo belt (Western Ladoga Region): Geochemical properties. Stratigr. Geol. Correl. 22, 447–464 (2014). https://doi.org/10.1134/S0869593814050062

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