AGE OF HIGH-MG GRANITOIDS OF THE NYUKOZERO MASSIF, KARELIA

Abstract

Nukozero massif dating was conducted using granodiorite - the massif's dominating rock. For geochronological U-Pb-analysis from the rock were extracted primary-magmatic minerals: two species of sphene, two species of zircon and two species of apatite. It's concluded that crystallization of Nukozero massif sanukitoids (Mg granitoids of specific composition) took place 2732 (plus minus 10) million ears ago.