THE U-PB AGE OF THE FEDOROV SEQUENCE OF THE ALDAN GRANULITE-GNEISS MEGACOMPLEX, THE ALDAN SHIELD

Abstract

The results of geochronological investigation confirm the assumption of the Early Proterozoic age of Fedorov rock mass. The estimated age (2006±3 mln years) of metaandesite protolytes of this series agrees with age estimates for tonalite-trondiemite orthogneiss of the Timpton complex (2011±2 mln ears) and for Ungrin gabbro-diorite-tonalite-trondiemite complex (2016±5 mln ears). It permits to consider formation of Fedorov group and the mentioned complexes in the framework of geodynamic system: active edge of Olekmo-Aldan continental platform - Fedorov island arc.