Granitoids of the Evyugan complex of the Kharbey block (Polar Urals): new geochronological data

By the first conducted 40Ar/39Ar-isotope-geochronological studies of muscovite (345±4 Ma) and porphyroblastic microcline (347±14 Ma) in gneissogranites of the Evyugan complex of the Kharbey block of the Kharbey anticlinorium, these rock-forming minerals are synkinimatic and formed under the conditions of the Ural orogeny. The obtained ages practically coincide with the ages of glaucophane metamorphism (347±72 Ma) and eclogite exhumation (360 Ma) in the Polar Urals. New determinations of radiological U/Pb age of gneissogranites using the laser ablation method (494±2 Ma) with the dual nature of granite gneissic banding (relict and dynamic) contribute to the understanding the formation geology of the polygenic-rheomorphic Evyugan complex. The formation of gneissogranites of the Evyugan complex presumably matches with the period from the Late Cambrian to the Early Carboniferous.