Abstract
Comparative analysis of the structure and mineralogical composition of major structural-mineralogical complexes and the evolution of the Meso-Neoarchean Karelian-Belomorian-Kola and the Paleoproterozoic Lapland-Kola and Svecofennian orogen of the Fennoscandian Shield was performed. It is noted that the lithosphere of the former (Archean) is 200-250 km thick, while the latter is 150- 200 km thick. Overlapping-overthrust structures contribute mostly to the earth’s crust architecture of both orogens. 3.0-2.6 and 2.0-1.65 Ga ago, each of them displayed spreading, subduction, collision and mantle plumes, and the general sequence of these events is comparable to Phanerozoic. The formation of both the Archean and Paleoproterozoic orogens took about 350 Ma. This shows that the Archean and Paleoproterozoic orogens do not differ in geodynamic nature from each other and from modern structures of this type.
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