Geochronology of the rocks of the substrate and ores of rare metal - rare earth deposits and ore occurrences in the north of the Urals and Timan

The results of the analysis of the collected over years data on the isotopic dating and new U-Pb, Rb-Sr, Sm-Nd, Ar-Ar geochronological determinations on rocks and minerals from rare-metal (Nb-Ta, Y and HREE, Zr, less Be) deposits and occurrences developed in the north of the Urals, the formation of which is associated with the alkaline conversion processes of various substrates are given. It is established that the substrate for efficient rare-metal metasomatites of the north of the Urals are both the Vendian-Cambrian granitoids (Polar and Subpo- lar Urals), and the Early mid-Ordovician volcanogenic-sedimentary deposits (Subpolar and North Urals). Early-mid-Ordovician isotopic datings obtained on ore rocks indicate the transformation of matter during the rifting period and the Carboniferous-Permian isotopic datings indicate the collision processes of formation of Uralides and subsequent plume processes. In the Middle and North Timan complex deposits and occurrences are genetically associated with alkaline (carbonatites, syenites) igneous rocks formed as a result of the neo-Proterozoic (Late Riphean and Vendian) plume pulse.