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Article
Geologica Carpathica, 1994, vol. 45, no. 5
THE VARISCAN WEST-CARPATHIAN GRANITIC PEGMATITES: MINERALOGY, PETROGENESIS AND RELATIONSHIP TO PEGMATITE POPULATIONS IN THE EASTERN ALPS AND ROMANIAN CARPATHIANS
Abstract
West-Carpathian granitic pegmatites are spatially and genetically connected with Variscan Carboniferous granitic rocks. Two basic groups are distinguished: 1 — The Moravany type (PMOG) and Prasiva type (PAOG). PMOG are connected with Lower Carboniferous monazite-bearing S>I-type granodiorites-granites and contain accessory minerals of Be and Nb-Ta (Ti-poor). PAOG are connected with Middle-Upper Carboniferous I-type tonalites to granites, and contain a Be, Ti-Nb-Ta bearing assemblage. Pegmatites originated at temperatures and pressures about 650–700 to 350 °C and 400–300 MPa (PMOG) and 700–450 °C and 200 MPa (PAOG). A limited hydrothermal overprint is apparent. The Variscan West-Carpathian pegmatites show general similarity with pre-Alpine pegmatites in adjacent Eastern Alps and Romanian Carpathians. These pegmatites also contain Be, Nb-Ta mineralization but locally with Li-phases (mainly spodumene) and they are commonly remote from potential parental granites.
Pages:
313 - 318
Published online:
0. 0. 1994