Vetreny belt as a geological heritage of unique paleoproterozoic tectonomagmatic processes in the Fennoscandin shield

We presented the history of discovery and development of geological hypotheses about the conditions of formation of one of the largest Paloproterozoic structures of the Baltic Shield  — the Vetreny Belt. Its uniqueness in relation to the same-age sedimentary-volcanogenic structures of the region is shown, consisting of the formation of volcanics with the spinifex structure, typical only for Archean formations. The unique composition of rocks with good preservation of primary structures and minerals was established for the Vetreny Belt. The experiment proved that volcanic rocks belong to the komatiite series. The problems of stratigraphic and tectonic schemes were considered, some of which are still debatable. The study of the isotopic composition of detrital zircon by LA-ICP-MS from metaterrigenic rocks of the Vetreny Belt hypothesizes calm tectonic conditions of sedimentation, a stable level of erosional shearing, and the age of formation of the structure being Sumian. 

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