CARBONATITE SOURCES OF THE II'MENY-VISHNEVOGORSK COMPLEX: EVIDENCE FROM SR AND ND ISOTOPE DATA ON CARBONATES

Abstract

The alkaline–carbonatite complex of the Paleozoic structure of the Urals is located in the Precambrian Sysert–Il’menogorsk block, which includes two structural levels and experienced a long-term evolution. The core of the block (lower structural level) is composed of the diaphthoritic gneiss granulites and migmatites of the Selyanka Sequence with the U–Pb zircon age of 1820 ± 70 Ma.