Rare metal granites of the Katugin complex (Aldan shield): Sources and geodynamic formation settings

Isotope–Geochemical Sm–Nd studies of the Early Proterozoic alkaline granites of the Katugan complex (Aldan shield) were carried out. The unique Katugan rare metals (Ta, Nb, Zr, Y, and REE) deposit is confined to these granites. Parent melts of the granites are of mantle–crustal nature.