THE TOKSKO-ALGOMIN IGNEOUS COMPLEX OF THE DZHUGDZHUR-STANOVOI FOLDED REGION: AGE AND GEODYNAMIC SETTING

Abstract

The Dzhugdzhur–Stanovoi mobile belt (DSMB) represents one of the most intricate tectonic structures of the Siberian Craton.1 In addition to strongly metamorphosed complexes that are traditionally referred to as the Early Precambrian, the DSMB comprises abundant Phanerozoic plutonic and volcanic rock complexes related to development of the Central Asian, Mongol–Okhotsk, and Pacific orogenic belts. Diverse manifestations of this magmatism and presumed structural–metamorphic reworkings of different-age (Precambrian–Mesozoic) igneous rocks in the course of subduction, accretion, and collision processes poses the problem of reliable discrimination of oldest rocks among metamorphic complexes of the DSMB basement. In this connection, geochronology of assumed old plutonic complexes that are characterized by distinct geological relationships with metamorphic rocks is a first-priority task in comprehensive investigations of the DSMB system.