The tectonics and metallogeny of the Precambrian of the Aldan-Stanovoy Shield

Abstract

The Aldan-Stanovoy Shield, located in the southeastern North Asian craton, resulted from the collision of Archean protocratons and Paleoproterozoic microcontinents in the period of 2.0–1.9 Ga. The tectonic structure of the Aldan-Stanovoy Shield is defined by a combination of terranes differing in age and degree of metamorphism. These are the West Aldan granite-greenstone terrane, the Central Aldan superterrane (Nimnyr granulite-orthogneiss and Sutam granulite-paragneiss terranes), the East Aldan superterrane (Uchur granulite-paragneiss and Batomga granite-greenstone terranes), as well as the Tynda tonalite-trondhjemitegneiss and the Chogar granulite-orthogneiss terranes. The boundaries between the terranes are faults and collision suture zones. The overlap assemblages include diversified sedimentary and volcanogenic-sedimentary rocks of Paleoproterozoic age. We have recognized within the Aldan-Stanovoy shield: (1) pre-collisional metallogenic zones; (2) the collision-related Kalar-Uchur metallogenic belt of Paleoproterozoic age; and (3) the Chara-Uchur post-collisional belt related to intracontinental rifting in the late Pale-oproterozoic.