Carbonatite sources of the Il’meny-Vishnevogorsk complex: Evidence from Sr and Nd isotope data on carbonates

Researchers obtained Sr and Nd data on carbonates from calcite, calcitedolomite, and dolomite carbonatites in the northern part of the Il'meny-Vishnevogorsk alkaline complex, which includes the Vishnevogorsk and Buldym niobium ore fields. The carbonatites were formed from two different sources. The carbonatites of the Buldym Massif were presumably formed from the older EM1-type source enriched in radiogenic Sr and nonradiogenic Nd, whereas carbonatites from the miaskites and host amphibolites were derived from the more depleted source.