ORE-MAGMATIC SYSTEMS WITH NOBLE METALS IN THE NORTHERN MARGINAL SECTOR OF THE ARGUN SUPERTERRANE

Abstract

The Argun Superterrane or Kerulen–Argun–Mamyn ensialic composite massif represents the Lower Precambrian crystalline basement of the Amur geoblock. The superterrane is characterized by the primary mantle–core heterogeneity, increased mobility, and intense tectonothermal reworking under the influence of multiple processes of destruction and granitization. These processes are probably related to the confinement of the terrane between two polycyclic fold–thrust systems (the South Mongol or Dasinanlin–Selemdzha system in the south and the Mongol–Okhotsk system in the north). The superterrane is separated from the Mongol–Okhotsk system by the Uldza, West Aginsk, East Aginsk, Prishilka, South Tukuringra, and other tectonic zones that are segments of the united marginal suture of the Late Proterozoic or probably an earlier time.