OH defects in cassiterite

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doi: 10.1007/s00710-004-0040-x
Authors:Losos, Z.; Beran, A.
Author Affiliations:Primary:
Masaryk University Brno, Institute of Geological Sciences, Brno, Czech Republic
Other:
Universitat Wien, Austria
Volume Title:Light elements in rock-forming minerals
Volume Authors:Beran, A., prefacer; Libowitzky, E.
Source:Mineralogy and Petrology, 81(3-4), p.219-234; LERM 2003, Nove Mesto, Czech Republic, June 20-25, 2003, prefaced by A. Beran and E. Libowitzky. Publisher: Springer-Verlag, Vienna, Austria. ISSN: 0930-0708
Publication Date:2004
Note:In English. 30 refs.; illus., incl. 4 tables
Summary:Two infrared (IR) spectral types are discerned in cassiterites with OH defect concentrations ranging from several wt. ppm H2O in synthetic melt-grown samples up to 0.017 wt.% in natural samples of hydrothermal origin. Spectrum type I is characterised by one sharp band centred at 3255 cm-1, type II spectra reveal an additional band group centred around 3340 cm-1, which is clearly correlated with the presence of Ti. Both OH band groups are strongly polarised with maximum absorption perpendicular to the c axis. Type I spectra prevail in nearly colourless samples, type II spectra typically occur in light to dark brown cassiterites, bearing essentially higher amounts of minor elements, especially Ti, Nb, Ta, W, Zr, and Fe. The total amount of water is not significantly correlated with the minor element content. It is concluded that different OH concentrations reflect different water activities prevalent during the formation of cassiterite crystals in different geological environments. [H.P.B.]
Sections:Mineral data
Subsections:Non-silicates
Subjects:Cassiterite; Crystal structure; Defects; Hydroxyl ion; Infrared spectra; Oxides; Spectra; Bolivia; Brazil; Central Europe; Czech Republic; Europe; France; Iberian Peninsula; Portugal; South America; Southern Europe; Western Europe
Abstract Numbers:04M/3590
Record ID:2010062487
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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