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American Mineralogist; February 2006; v. 91; no. 2-3; p. 467-470; DOI: 10.2138/am.2006.2107
© 2006 Mineralogical Society of America
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Letter

Laser Raman spectroscopic measurements of water in unexposed glass inclusions

Rainer Thomas1,*, Vadim S. Kamenetsky2 and Paul Davidson2

1 GeoForschungsZentrum Potsdam, Division 4, Telegrafenberg, 14473 Potsdam, Germany
2 ARC Centre of Excellence in Ore Deposits, University of Tasmania, Hobart 7001, Australia

Correspondence: * E-mail: thomas{at}gfz-potsdam.de

A method is proposed for determining the water concentration in silicate melt inclusions (MI) by confocal micro-Raman spectroscopy, without exposing the inclusions for measurement (a prerequisite of all previous methods). The latter is important for extremely water-rich MI (e.g., those in evolved granites and pegmatites), which would loose H2O on exposure. Furthermore, this technique permits determination of the water concentration in a single MI. We use a comparative technique, determining the total water content of a sample against a reference glass of known water content. Because this process is non-destructive it does not preclude the subsequent use of other analytical techniques.

Key Words: Raman spectroscopy • water determination • unexposed silicate melt inclusions • water in glasses




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