PEGMATITES IN 2 SUITES OF VARISCAN OROGENIC GRANITIC-ROCKS (WESTERN CARPATHIANS, SLOVAKIA)

Two rare-element (Be-Nb-Ta) granitic pegmatite populations have been o bserved in the Western Carpathian granitoids: (I)pegmatites with Ti- a nd Mg-poor mineral assemblages, and (2) pegmatites carrying Ti- and Mg -enriched phases (Nb-Ta oxide minerals, garnet, beryl). Mineral chemis try of the pegmatites reflects the primary composition of the parental granitic rocks. The first pegmatite type is derived from monazite-bea ring orogenic granites (MOG), and the second from allanite-bearing oro genic granites (AOG). The MOG produced an abundance of pegmatites, whe reas in the AOG group the pegmatites are less evolved and relatively s carce. The two kinds of pegmatites support the subdivision of the West ern Carpathian granitoids into two principal genetic groups.