Title

A.L. KONOVALOV, K.I. LOKHOV, A.V. CHERCASHIN, O.V. VAKULENKO (VSEGEI)

Tectonic boundary between the Late Proterozoic shales and crystalline metamorphic rocks of the Kharbey anticlinorium (Polar Urals)

New data concerning geological structure of unconformity zone between greenshists and migmatite-­gneiss­-amphibolite complexes of the Kharbey anticlinorium have been revealed. Authors have carried out geological, structural, geochemical, geochronological, and U-­Pb isotopic researches of zircons from metamorphic rocks. As a result, new isotopic ages of metamorphic rocks of migmatite-­gneiss­-amphibolite complex and granitic «pebbles» from basal conglomerates of greenshist complex have been obtained. Authors state that the contact between these complexes is tectonic. The result of the research shows that large­scale metamorphic events took place in Polar Urals at Vendian – Early Cambrian time and on the boundary between Silurian and Devonian time.
Keywords: Polar Urals, isotopic geochronology, metamorphism, Precambrian, gneiss, amphibolite, greenshists, unconformity, tectonites.