Geochemistry and petrology of 2.40–2.45Ga magmatic rocks in the north-western Belomorian Belt, Fennoscandian Shield, Russia

Geochronology, mineral inclusions, and geochemistry of zircons in eclogitized gabbronorites in the Gridino area, Belomorian province

“…A slightly older U-Pb age of 2469 ± 30 Ma was determined in a larger (>150 μm) prismatic zircon overgrown by a younger (1948 Ma) zone. 2 The U-Pb system of these zircons is only weakly disturbed, and their ages are close to concordant ones (Fig. 3, Table 1).…”

“…1a). The magmatic episode in the genesis of this complex was isotopically dated at 2.43-2.44 Ga [2][3][4], but the metamorphic transformations of the rocks to the eclogite and amphibolite facies have not been dated as yet.…”

Geochronology of the Palaeoproterozoic Kautokeino Greenstone Belt, Finnmark, Norway: Tectonic implications in a Fennoscandia context

“…9A, B). Rare-earth (Balashov et al, 1993(Balashov et al, ), c. 2450 Ma plutons from the Belomorian Craton (Lobach-Zhuchenko et al, 1998), c. 2450-2428 Ma plutons from the Karelian Craton (Huhma et al, 1990;Amelin & Semenov, 1996;Perttunen & Vaasjoki, 2001;Hanski et al, 2001bHanski et al, ), c. 2450Hanski et al, -2410 Ma volcanic rocks from Vetreny Belt (Puchtel et al, 1996(Puchtel et al, , 1997(Puchtel et al, ), c. 2440 Onkamo Group volcanic rocks (Hanski & Huhma, 2005), c. 2403 Ma Ringvassøy dykes (Kullerud et al, 2006(Kullerud et al, ), c. 2504(Kullerud et al, , 2450(Kullerud et al, , 2310(Kullerud et al, and 2140 Ma dykes in the Karelian Craton (Amelin & Semenov, 1996;Mertanen et al, 2006;Stepanova et al, 2014Stepanova et al, , 2015, c. 2330 Ma Runkaus volcanic rocks in Peräpohja Schist Belt (Huhma et al, 1990), c. 2220 Ma Haaskalehto-type sills and dykes (Huhma et al, 1990;Hanski et al, 2010), 2137 ± 5 Ma amphibolite of Čáskejas Formation (deep pink; Krill et al, 1985) and davidite of the Bidjovagge deposit (pale pink; Bjørlykke et al, 1990) in the Kautokeino Greenstone Belt, c. 2090 Ma Jouttiaapa volcanic rocks in Peräpohja Schist Belt (Huhma et al, 1990(Huhma et al, ), c. 2085 Ma komatiites in the Karasjok Greenstone Belt (Henriksen, 1983;Krill et al, 1985), c. 2060 Ma Siilinjärvi volcanic rocks (Lahtinen et al, 2015b), c. 2060Ma Jeesiörova and Peuramaa komatiites in Savukoski Group in Central Lapland Greenstone Belt (Hanski et a...…”

Early Proterozoic U-Pb Zircon Ages from Basement Gneiss at the Solovetsky Archipelago, White Sea, Russia

“…Composition and age of the rock units forming the BMB can vary on a scale of sometimes a few meters (e.g. [4,30,33]); hence it is possible that a complex basement is situated beneath the cover of glacial deposits at the Solovetsky archipelago. As the geological map given by [6] is of a scale of 1:4,000,000, and the map of [7] lacks detailed information about magmatic rocks, thorough geological mapping and dating of possible other rock units of outcropping basement material at the islands may uncover a possibly complex geology.…”