CONDITIONS OF DISTRIBUTION AND GEOLOGICAL AND GEOCHEMICAL PREREQUISITES FOR THE FORMATION OF URANIUM, GOLD-URANIUM, GOLD AND RARE-METAL MINERALIZATION IN THE CENTRAL METALLOGENIC BELT OF THE YENISEY RIDGE

A. D. Nozhkin

Mezoproterozoic (1,6-1,05 Ga), Early Neoproterozoic (1,05-0,8 Ga) and Late Neoproterozoic (0,8- 0,6 Ga) stages of magmatism and the Earths crust evolution of the Yenisey Ridge are distinguished based on geological and isotope-geochronological data. It is shown that the Central metallogenic belt with uranium, gold-uranium, gold and rare-metal mineralization is confined to the Tatarka-Ishimbin fault system where repeated riftogenic and intraplate magmatism took place (at the turns of 780, 750, 700 and 670-650 Ma) during the postorogenic stage. The main types of uranium, gold-uranium, gold-ore and rare-metal mineralization are distinguished, increased (up to economically sound) gold content within known uranium deposits and ore manifestations is revealed. The correlation of mineralization with initiation stages of rift structures and manifestations of intraplate magmatism is also shown. Geological and geochemical prerequisites for the formation and forecasting of gold-uranium and gold-ore deposits are summarized.

Key words: Meso- and Neoproterozoic, rifting stage, intraplate magmatism; U, Au-U, Au mineralization, Yenisey Ridge.

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