Record details

Title
    Extreme variation and apparent reversal of Nb-Ta fractionation in columbite-group minerals from the Scheibengraben beryl-columbite pegmatite, Maršíkov, Czech Republic
Author
    Černý, Petr
    Novák, Milan
    Uher, Pavel
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    European Journal of Mineralogy
Vol./nr.
    Roč. 15, č. 5
Pages
    10
Year
    2003
Thesaurus term
    Czech Republic
    Extreme variation and apparent reversal of Nb-Ta fractionation in columbite-group minerals from the Scheibengraben beryl-columbite pegmatite
    Maršíkov
Keyword
    Apparent
    Beryl-columbite
    Columbite-group
    Czech
    Extreme
    Fractionation
    Maršíkov
    Minerals
    Nb-Ta
    Pegmatite
    Republic
    Reversal
    Scheibengraben
    Variation
Abstract (in english)
   Compositional variation in columbite-group minerals was studied from the beryl-columbite pegmatite at Scheibengraben, Maršíkov, Northern Moravia, Czech Republic. The pegmatite consists of five textural-paragenetic units, from the least to the most evolved: volumetrically dominant coarse-grained unit, subordinate graphic and blocky units and a minor cleavelandite unit. Saccharoidal albite unit is rather randomly distributed within the dike. It replaces and/or crosscuts all other units except the cleavelandite unit. Columbite-group minerals are the dominant Nb,Ta-oxide phases in all units. They are associated with other Nb,Ta-oxide minerals: minerals of the pyrochlore subgroup and fersmite in the coarse-grained unit, and minerals of the microlite subgroup, ferrotapiolite and rynersonite in the cleavelandite unit. The extreme Nb-Ta [Ta/(Ta+Nb) = 0.06 to 0.97 (microlite 0.99)] and appreciable Fe-Mn [Mn/(Mn+Fe) = (ferrotapiolite 0.22) 0.35 to 0.
Contributor
    MU Brno, Přírodovědecká fakulta
Contributor code
    MU, PřF
Source format
    R
Import date
    8. 8. 2012