Proterozoic tectonothermal history in the western part of the

• Main Authors: Bogdanova, S.V., Page, L.M., Skridlaitė, Gražina, Taran, L.N.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2001
• Subjects: U-pb zircon; Rapakivi granite; Baltic shield; Isotopic age; Belorussia; Geology; Spectra; Sweden; Crust; Belt; Uralia; Fennoscandia; Fennoscandian
• Online Access: http://lmavb.lvb.lt/LMAVB:ELABAPDB5090921&prefLang=en_US

dTwenty-three new Ar-40/Ar-39 amphibole age determinations have been carried out to date major crustal boundaries in the sediment-covered crystalline basement of the western part of the East European Craton, in the area between the Baltic (Fennoscandian) and the Ukrainian Shields. That crystalline basement is characterised by a pronounced alternation of granulite-and amphibolite -facies rock belts identified from geophysical surveys and deep drill core samples. These belts strike NNE to NW and are considered to represent accretionary stacking of different Palaeoproterozoic (2.0-1.85 Ga) terranes of juvenile crust along the margins of the Archaean protocontinents of Fennoscandia, Sarmatia and Volgo-Uralia, which make up the cores of the EEC.