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Evolution of OH groups in diopside and feldspars with temperature

Yang Yan, Xia Qunke and Zhang Peipei
Evolution of OH groups in diopside and feldspars with temperature
European Journal of Mineralogy (March 2015) 27 (2): 185-192

Abstract

Using in situ FTIR and heating/cooling stage, we have investigated the temperature evolutions of OH bands in natural diopside, plagioclase and anorthoclase. The frequencies of three main resolved OH bands (3645, 3464 and 3361 cm (super -1) called band 1, 2 and 3, respectively) in diopside shift linearly with temperature. With increasing temperature, band 1 shifts to lower wavenumbers, band 2 exhibits almost no shift while band 3 shifts to higher wavenumbers. The integral absorbance of band 1, 2 and 3 decreases by 18.8, 10.1 and 31.4 %, respectively, from -50 to 400 degrees C. No simultaneous growth and decline of OH bands is observed during the whole process, excluding H proton transfer. In contrast to OH defects in diopside, the bands at lower frequencies in feldspars weaken while their bands at higher frequencies strengthen with increasing temperature, indicating H protons change positions in the crystal structure from one site with stronger H bond to another site with weaker H bond. These results reflect different local environments of OH defects and temperature dependent OH absorption coefficients in diopside, and change of H sites in feldspar structure with temperature. It provides important constraints on the microscopic mechanisms of hydrogen incorporation in these minerals.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 27
Serial Issue: 2
Title: Evolution of OH groups in diopside and feldspars with temperature
Affiliation: University of Science and Technology of China, School of Earth and Space Sciences, CAS Key Laboratory of Crust-Mantle Materials and Environments, Hefei, China
Pages: 185-192
Published: 201503
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 46
Accession Number: 2015-052250
Categories: Mineralogy of silicates
Document Type: Serial
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: 201524
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