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Vol. 5 (2002 year), No. 1

Gavrilenko B.V., Nikitin I.V., Zozulya D.R., Kudryashov N.M., Petrovsky M.N., Korsakova O.P. and Galkin N.N.
Geology, tectonics, age and metallogeny of the Archaean Kolmozero-Voron'ya suture zone, the Kola region

The new data on geology, structure and the age of the Archaean Kolmozero-Voron'ya suture zone from the NE Baltic Shield have been presented. The zone is located in the junction of Murmansk, Central Kola and Keivy terranes and marks the ancient Titovka-Keivy deep-seated fault. It is characterized by the tectonics suture style and was formed in the conditions of the sliping plastic and quasi-plastic flow. The structural combination of the steep longitudinal slips with cross reverse faults and trusts, separated by the lenses' and slices' assemblages, was formed under the dominating compression combined with the compensating extension. There are several stages in the suture zone evolution: protooceanic with komatiite-toleite magmatism (3.0-2.9 Ga); volcanic arc with andesite-rhyolite magmatism (2.9-2.8 Ga); regional metamorphism and granitization (2.7-2.6 Ga); regressive metamorphism and potassium metasomatosis (2.5-2.2 Ga). The metallogenic evolution of the Kolmozero-Voron'ya zone was the following: siderophile elements - Fe, Ni, Au, Ag (mantle source), chalkophile elements - Cu, Mo, Pb, Bi (mixed mantle-crustal source), lithophile elements - Li, Cs, Be, Ta, Nb (crustal source), and it is in accordance with the change of the tectonic regimes in the zone geological history.

(in Russian, стр.18, fig. 7, tables. 2, ref 84, MS Word 95, MS Word 95 1670 Kb)