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Micro-FTIR imaging; an advanced method for the determination of CO (sub 2) and H (sub 2) O concentration gradients in silicate glasses

Holger Marxer and Marcus Nowak
Micro-FTIR imaging; an advanced method for the determination of CO (sub 2) and H (sub 2) O concentration gradients in silicate glasses (in EMPG XIV, Kiel; Experimental mineralogy, petrology and geochemistry symposium, Oliver Beerman (editor), Astrid Holzheid (editor) and Philip Kegler (editor))
European Journal of Mineralogy (September 2013) 25 (3): 307-316

Abstract

Glass samples of diffusion couple experiments with rhyolitic to hawaiitic melts were analyzed by FTIR microscopy with a common single element and a 64 X 64 element focal plane array detector to obtain total CO (sub 2) and H (sub 2) O concentration distance profiles. In contrast to the single element detector, the array detector facilitates mid-infrared spectral imaging with a resolution on a micrometer scale. The imaged sample information was converted to multiple parallel concentration distance profiles, using the absorption band areas of the dissolved volatile species. The bulk CO (sub 2) and H (sub 2) O diffusivities from measurements with different array resolutions range from log D = -11.03 to -11.33 m (super 2) .s (super -1) at 500 MPa and 1523-1623 K. All determined diffusion coefficients are within the error identical to single element detector analysis. Further test measurements were performed on a partially degassed, vesiculated phonolite in order to visualize the concentration of H (sub 2) O around bubbles. Both applications confirm that FTIR imaging is a convenient tool to investigate the spatial distribution of CO (sub 2) and H (sub 2) O in silicate glasses, especially in terms of diffusion-related studies.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 3
Title: Micro-FTIR imaging; an advanced method for the determination of CO (sub 2) and H (sub 2) O concentration gradients in silicate glasses
Title: EMPG XIV, Kiel; Experimental mineralogy, petrology and geochemistry symposium
Author(s): Marxer, HolgerNowak, Marcus
Author(s): Beerman, Olivereditor
Author(s): Holzheid, Astrideditor
Author(s): Kegler, Philipeditor
Affiliation: University of Tuebingen, Department of Geosciences, Tubingen, Germany
Pages: 307-316
Published: 201309
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: Fourteenth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Kiel, DEU, Germany
Meeting date: 20120304March 4-7, 2012
References: 26
Accession Number: 2013-083980
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201349
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