Record details

Title
    Phosphorus - an omnipresent minor element in garnet of diverse textural types from leucocratic granitic rocks
Author
    Breiter, Karel
    Cempírek, Jan
    Koller, Friedrich
    Novák, Milan
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Mineralogy and Petrology
Vol./nr.
    Roč. 85, č. 3-4
Pages
    17
Year
    2005
Thesaurus term
    garnet
    geochemistry
    granite
    granitic rocks
    pegmatite
    phosphorus
    silicates
    substitutions
Keyword
    Diverse
    Element
    Garnet
    Granitic
    Leucocratic
    Minor
    Omnipresent
    Phosphorus
    Rocks
    Textural
    Types
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.
Contributor
    MU Brno, Přírodovědecká fakulta
Contributor code
    MU, PřF
Source format
    R
Import date
    8. 8. 2012