AGE AND GEODYNAMIC SETTINGS OF MIASKITE-PEGMATITES, CARBONATITES, AND Nb-Zr MINERALIZATION OF THE ILMENO-VISHNEVOGORSKY ALKALINE COMPLEX, SOUTH URAL (U-Pb AND Rb-Sr ISOTOPE DATA)

The Ilmeno-Vishnevogorsky miaskite-phenite-carbonatite complex (IVС), located in the Urals folded region, is a representative of "linear type" carbonatite complexes, with which Nb-Zr deposits are associated. ore potential linear time and duration ore-forming processes, geodynamic setting remain subject discussion. In order to estimate age formation processes IVC, U-Pb dating zircon (LA-ICP-MS) from miaskite-pegmatites, as well Rb-Sr ore-bearing (pyrochlore-bearing) varieties miaskite-pegmatites carbonatites (ID-TIMS) were carried out. IVC showed Permian (280±8 Ma, P 1 – main generation). Rb-Sr-mineral isochron miaskite-pegmatite close 274±5 Ma (P ), confirming results U-Pb-dating miaskite-pegmatites. pyrochlore (sovites II) an 250±3 (T ). Rb-Sr- indicate that pegmatite- associated Zr-Nb occurred at late collisional postcollisional stage development Ural region. Based on data obtained, model for was proposed.