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Archaean rocks from southeastern Karelia (Karelian granite greenstone terrain)

Authors
Journal
Precambrian Research
0301-9268
Publisher
Elsevier
Publication Date
Volume
62
Issue
4
Identifiers
DOI: 10.1016/0301-9268(93)90012-q
Disciplines
  • Chemistry
  • Earth Science

Abstract

Abstract We subdivide southeastern Karelia (Vodlozero) into two different areas on geological grounds. (1) The Vodla River area in which the metamorphic complex contains gneisses and amphibolites which yield UPb zircon ages of 3.14±0.03 Ga and 3.13±0.09 Ga, respectively. They were affected by polyphase deformation and polymetamorphism during 3.1 and 2.8 Ga events. (2) The Lay-ruchey River and Vyg River area where two groups of tonalites with UPb ages of 3.17 and 3.14 Ga can be distinguished by their major and trace element compositions. The first group is similar to some tonalites from the TTG suite in eastern Finland (Martin et al., 1983). The second group is similar to tonalites (TTG suite) from Lapland (Jahn et al., 1984). Two groups of amphibolites can also be distinguished in the Vodlozero region yielding UPb ages of 3.13 and 2.86 Ga. Geological relationships together with geochemical features show the younger group to be comparable to metabasalts from greenstone belts. Tonalites, gneisses and the older amphibolites have model Nd ages which are older than the UPb zircon ages from the same suites.

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