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In situ infrared spectroscopic studies of OH, H (sub 2) O and CO (sub 2) in moganite at high temperatures

Ming Zhang and Terry Moxon
In situ infrared spectroscopic studies of OH, H (sub 2) O and CO (sub 2) in moganite at high temperatures
European Journal of Mineralogy (January 2012) 24 (1): 123-131

Abstract

The thermal stabilities of OH and H (sub 2) O in moganite from the Mogan D formation, Gran Canaria have been investigated during heating and cooling using in situ Fourier transform infrared spectroscopy. The spectra have also been analysed in terms of CO (sub 2) incorporated in moganite. The results show that while the thermal responses of H (sub 2) O and OH in moganite display similarities to those reported in agate, the spectra are not completely identical. Absorptions in the O-H stretching region reveal that dehydration and dehydroxylation is a multi-stage process. Although hydrogen loss starts below 400-500 K, hydrous species may well remain in moganite even at 1060 K. After cooling, the spectra of multiphonon bands from lattice vibrations in a moganite sample that had been heated up to 1060 K became similar to those of agate implying a moganite to alpha -quartz transformation can be thermally induced. CO (sub 2) was first detected at temperatures approximately 460 K. However, a further increase in CO (sub 2) absorption has been identified around 940 K, and this is probably associated with the decomposition of CO (sub 3) .


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 24
Serial Issue: 1
Title: In situ infrared spectroscopic studies of OH, H (sub 2) O and CO (sub 2) in moganite at high temperatures
Affiliation: University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Pages: 123-131
Published: 201201
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 30
Accession Number: 2012-030477
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N27°43'60" - N28°10'00", W15°49'60" - W15°22'00"
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: 201216
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