fig01.htm

Figure 1. Early Paleoproterozoic Baltic Large Igneous Province of the siliceous high-Mg (boninite-like) series. (1) Svecofennides (Late Paleoproterozoic); (2) Paleoproterozoic volcanosedimentary belts with SHMS rocks at the base; (3) Early Paleoproterozoic transitional mobile belts: BMB - Belomorian Mobile Belt, TLB - Tersk-Lotta Belt; (4) Early Paleoproterozoic Lapland-Umba Granulite Belt (LUGB) with Porieguba-Umba block (PUB); (5) Archean basement of the Baltic Province; (6) largest layered intrusions: (B) Burakovka, (Kem) Kemi, (K) Koitilainen, (O) Olanga (Oulanka) group, (Pe) Penikat, (To) Tornio, (G) Generalskaya Mount, (Ko) Koilismaa, (Mo) Monchegorsk Complex, (Pa) Pana Tundra, (F) Fedorov Tundra, (Po) Portimo, (7) Late Paleoproterozoic Main Lapland Thrust, (8) suture zone of Caledonian nappes.
The upper inset map shows the reconstruction of the location of the main tectonic features in the Early Paleoproterozoic, the lower inset map is the schematic geological map of a typical area in the Belomorian Belt with small bodies of basic and ultrabasic rocks of the drusite complex (Northern Karelia, Pezhostrov I., Keretsky Archipelago, the White Sea): (1) small lenticular boudins of garnet amphibolite; (2) thick-layered bodies of plagioclase lherzolite and olivine gabbronorite with disrupted contacts; (3) indistinctly layered metamorphozed gabbronorite bodies; (4) metagabbro-anorthosite bodies: (a) coarse-grained rocks, (b) fine- and medium-grained rocks in inner contacts; (5) Archean plagiomigmatites.


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