caa a22 4500 44538994X CHVBK 20180317143043.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00710-011-0163-9 doi (NATIONALLICENCE)springer-10.1007/s00710-011-0163-9 Niobium-tantalum oxide minerals in the Jezuitské Lesy granitic pegmatite, Bratislava Massif, Slovakia: Ta to Nb and Fe to Mn evolutionary trends in a narrow Be,Cs-rich and Li,B-poor dike [Elektronische Daten] [Peter Chudík, Pavel Uher, Petr Gadas, Radek Škoda, Jaroslav Pršek] A complex assemblage of Nb-Ta-(Sn) oxide minerals occur in a relatively narrow (~1−2 m thick) extensively albitized, Hercynian granitic pegmatite dike intruding biotite granodiorites near Bratislava, SW Slovakia. The dike shows enrichment in beryl (locally Cs-rich) but absence of Li- and B-rich phases. Compositions and textural relationships indicate complex evolutions of Nb-Ta oxide phases with several generations presenting distinct textural and compositional features. The first generation of the Nb-Ta minerals from the quartz-microcline-muscovite zone show Ta,Fe-rich compositions with Ta# [Ta/(Ta + Nb)] = 0.52−0.70 (Ct I columbite-tantalite), 0.88−0.90 (Tap I ferrotapiolite) and 0.73−0.86 (Fw I ferrowodginite); Mn# [Mn/(Mn + Fe)] = 0.32−0.49 (Ct I), 0.06−0.10 (Tap I) and 0.33−0.41 (Fw I). The 2nd generation is represented by ferrocolumbite to ferrotantalite (Ct II) in saccharoidal albite zone, replacement zones of Ct II in Ct I, and irregular overgrowths of ferrotapiolite (Tap II) and ferrowodginite (Fw II) on Tap I grains. The minerals of the 2nd generation show decreasing of Ta# in comparison to the 1st group: 0.10−0.60 (Ct II), 0.85−0.87 (Tap II) and 0.73−0.77 (Fw II); Mn# attains 0.30−0.45 (Ct II), 0.06−0.09 (Tap II) and 0.26−0.37 (Fw II). The 3rd generation includes fissure fillings, overgrowths and replacement zones of manganocolumbite and manganotantalite (Ct III), ferrotapiolite (Tap III) and ferrowodginite (Fw III) on the older Nb-Ta phases (Ct I, Tap I, Fw I, Fw II), in the coarse-grained unit. The 3rd population displays distinct Mn# increasing (Ct III: 0.51−0.69, Tap III: 0.11−0.24, Fw III: 0.40−0.41), Ta# values reach 0.16−0.79 (Ct III), 0.88−0.92 (Tap III) and 0.80−0.81 (Fw III). The latest, 4th generation of the Nb-Ta phases represents irregular veinlets and patches of fluorcalciomicrolite, replacing Ct I, Tap I, Fw I, Ct II and Tap III. Decrease of Ta/(Ta + Nb) values in Ct II from the saccharoidal albite unit can be explained by crystallization from the albite-rich melt, which was significantly impoverished in Ta with respect to Nb, after crystallization of Ta-rich phases from the 1st generation (ferrotapiolite I, ferrowodginite I). Springer-Verlag, 2011 Chudík Peter Department of Mineral Deposits, Comenius University, Mlynská dolina, 842 15, Bratislava, Slovakia aut Uher Pavel Department of Mineralogy and Petrology, Comenius University, Mlynská dolina, 842 15, Bratislava, Slovakia aut Gadas Petr Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic aut Škoda Radek Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic aut Pršek Jaroslav Department of Economic and Mining Geology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland aut Mineralogy and Petrology Springer Vienna 102/1-4(2011-10-01), 15-27 0930-0708 102:1-4<15 2011 102 710 https://doi.org/10.1007/s00710-011-0163-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-011-0163-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chudík Peter Department of Mineral Deposits, Comenius University, Mlynská dolina, 842 15, Bratislava, Slovakia aut NATIONALLICENCE 700 1- Uher Pavel Department of Mineralogy and Petrology, Comenius University, Mlynská dolina, 842 15, Bratislava, Slovakia aut NATIONALLICENCE 700 1- Gadas Petr Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic aut NATIONALLICENCE 700 1- Škoda Radek Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic aut NATIONALLICENCE 700 1- Pršek Jaroslav Department of Economic and Mining Geology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer Vienna 102/1-4(2011-10-01), 15-27 0930-0708 102:1-4<15 2011 102 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer