Abstract
We consider the evolution of the A-type granite magmatism in the Cryogenian period during the tectonic transformation of the Yenisei Ridge from a postcollisional setting to the early development stage of an active continental margin. We report geochronological and geochemical data for A-type granites of two intrusions – the Strelka pluton belonging to the Glushikha postcollisional complex (752–718 Ma) and the Yagodka pluton of the Tatarka active continental margin complex (711–629 Ma). The new U-Pb and Ar/Ar geochronological data for the postcollisional Glushikha plutons indicates that the age intervals for these complexes can be combined, showing the uninterrupted evolution of A-type magmatism during the change in tectonic setting of the region.
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