Record details

    Phosphorus - an omnipresent minor element in garnet of diverse textural types from leucocratic granitic rocks
    Breiter, Karel
    Cempírek, Jan
    Koller, Friedrich
    Novák, Milan
Publication type
    článek v periodiku
Source title - serial
    Mineralogy and Petrology
    Roč. 85, č. 3-4
Thesaurus term
    granitic rocks
Abstract (in english)
   Elevated P contents of up to 0.086 apfu (1.21 wt.% P2O5) were found in garnet from leucocratic granitic rocks (orthogneisses, granites, barren to highly evolved pegmatites) in the Moldanubicum and Silesicum, Czech Republic, and in complex granitic pegmatites from southern California, USA, and Australia. Minor concentrations (0.15-0.55 wt.% P2O5) appear ubiquitous in garnet from leucocratic granitic rocks of different origins and degrees of fractionation. Garnet compositions exhibit negative correlations for P/Si and P/R2+ where R2+ = Fe + Mn + Mg + Ca, while Al is constant at ~ 2.05 apfu. Concentrations of Na are largely below 0.02 apfu but positively correlate with P. The main substitution may involve A-site vacancy and/or the presence of some light element(s) in the crystal structure. The substitution (xP2)(R2+Si2)-1 and/or alluaudite-type (NaxP3)(R2+Si3)-1 seem the most likely P-incorporating mechanisms.
    MU Brno, Přírodovědecká fakulta
Contributor code
    MU, PřF
Source format
Import date
    8. 8. 2012