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A composition-independent quantitative determination of the water content in silicate glasses and silicate melt inclusions by confocal Raman spectroscopy

Zajacz, Zoltán ; Halter, Werner ; Malfait, Wim ; Bachmann, Olivier ; Bodnar, Robert ; Hirschmann, Marc ; Mandeville, Charles ; Morizet, Yann ; Müntener, Othmar ; Ulmer, Peter ; Webster, James

In: Contributions to Mineralogy and Petrology, 2005, vol. 150, no. 6, p. 631-642

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    Titel
    • A composition-independent quantitative determination of the water content in silicate glasses and silicate melt inclusions by confocal Raman spectroscopy
    Autor
    • Zajacz, Zoltán. Department of Earth Sciences, Isotope Geochemistry and Mineral Resources, ETH Zürich, 8092, Zürich, Switzerland
    • Halter, Werner. Department of Earth Sciences, Isotope Geochemistry and Mineral Resources, ETH Zürich, 8092, Zürich, Switzerland
    • Malfait, Wim. Department of Earth Sciences, Isotope Geochemistry and Mineral Resources, ETH Zürich, 8092, Zürich, Switzerland
    • Bachmann, Olivier. Section des Sciences de la Terre, Université de Genève, Département de Minéralogie 13, rue des Maraìchers, 1211, GENEVE 4, Switzerland
    • Bodnar, Robert. Department of Geosciences, 4044 Derring Hall, Virginia Tech, 24061-0420, Blacksburg, VA, USA
    • Hirschmann, Marc. Department of Geology and Geophysics, University of Minnesota, 55455, Minneapolis, MN, USA
    • Mandeville, Charles. Department of Earth and Planetary Sciences, A.M.N.H., Central Park West at 79th Street, 10024-5192, New York, NY, USA
    • Morizet, Yann. Department of Earth Sciences, Isotope Geochemistry and Mineral Resources, ETH Zürich, 8092, Zürich, Switzerland
    • Müntener, Othmar. Institute of Geological Sciences, University of Bern, Baltzerstr. 1, 3012, Bern, Switzerland
    • Ulmer, Peter. Department of Earth Sciences, Institute for Mineralogy and Petrology, ETH Zürich, 8092, Zürich, Switzerland
    • Webster, James. Department of Earth and Planetary Sciences, A.M.N.H., Central Park West at 79th Street, 10024-5192, New York, NY, USA
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Contributions to Mineralogy and Petrology, 2005, vol. 150, no. 6, p. 631-642. Springer-Verlag
    Andere elektronische Ausgabe
    Klassifikation
    • Erdwissenschaften
    OAI-PMH-ID
    • oai:doc.rero.ch:312793
    Summary
    A new approach was developed to measure the water content of silicate glasses using Raman spectroscopy, which is independent of the glass matrix composition and structure. Contrary to previous studies, the compositional range of our studied silicate glasses was not restricted to rhyolites, but included andesitic, basaltic and phonolitic glasses. We used 21 glasses with known water contents for calibration. To reduce the uncertainties caused by the baseline removal and correct for the influence of the glass composition on the spectra, we developed the following strategy: (1) application of a frequency-dependent intensity correction of the Raman spectra; (2) normalization of the water peak using the broad T-O and T-O-T vibration band at 850-1250cm−1 wavenumbers (instead of the low wavenumber T-O-T broad band, which appeared to be highly sensitive to the FeO content and the degree of polymerization of the melt); (3) normalization of the integrated Si-O band area by the total number of tetrahedral cations and the position of the band maximum. The calibration line shows a ±0.4wt% uncertainty at one relative standard deviation in the range of 0.8-9.5wt% water and a wide range of natural melt compositions. This method provides a simple, quick, broadly available and cost-effective way for a quantitative determination of the water content of silicate glasses. Application to silicate melt inclusions yielded data in good agreement with SIMS data