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Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaíba igneous province, Brazil
-
E. Schingaro
,
M.F. Brigatti
Published/Copyright:
April 2, 2015
Abstract
Trioctahedral micas from kamafugitic lavas of Presidente Olegario (Brazil) are Ti-Fe-bearing fluorophlogopites. They were investigated using a combination of electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), and Mössbauer spectroscopy.
EPMA data yielded the following ranges: Al2O3 (8.7-10.1 wt%), MgO (19.6-20.6 wt%), FeO (5.7-6.5 wt%), TiO2 (5.9-7.5 wt%), K2O (8.9-9.7 wt%), Na2O (0.4 -0.6 wt%), and fluorine (3.4-4.1 wt%). Mössbauer investigation indicated: VIFe2+ - 60%, VIFe3+ - 10%, IVFe3+ - 30%. X-ray analysis indicated the 1M polytype, with cell parameters in the range a = 5.3208-5.3376, b = 9.2210-9.2464, c = 10.1227-10.155 Å, β = 100.157-100.194°. Structure refinements using anisotropic displacement parameters were performed in space group C2/m and converged to 2.01 ≤ R1 ≤ 3.51, 2.00 ≤ wR2 ≤ 3.51%.
The micas have no VIAl3+ and Na is probably partitioned over both interlayer and octahedral sites. Major substitutions are OH− ↔ F−, and the Ti-oxy substitution: VIM2+ + 2(OH)− ↔ VITi4+ + 2O2- + H2↑. Accordingly, the structural features of the studied micas encompass those typical of both fluorophlogopites and micas affected by Ti-oxy substitution.
Received: 2010-8-1
Accepted: 2010-12-17
Published Online: 2015-4-2
Published in Print: 2011-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Ti-fluorophlogopite;
Mössbauer spectroscopy;
crystal chemistry;
substitution mechanisms
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