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Infrared spectroscopic study of sulfate-bearing calcite from deep-sea bamboo coral

Etienne Balan, Julie Aufort, Sophie Pouille, Marie Dabos, Marc Blanchard, Michele Lazzeri, Claire Rollion-Bard and Dominique Blamart
Infrared spectroscopic study of sulfate-bearing calcite from deep-sea bamboo coral
European Journal of Mineralogy (June 2017) 29 (3): 397-408


The powder infrared spectra of a sulfate-bearing calcitic coral sample are recorded at room temperature in attenuated total reflectance (ATR) geometry and at low temperature in transmission geometry. The comparison of ATR spectra recorded with diamond or Ge crystal confirms that the width and the shape of the prominent absorption bands, related to CO (sub 3) groups, are dominantly affected by macroscopic electrostatic interactions. In contrast, the temperature-dependence of the position and width of weak and narrow absorption bands, related to CO (sub 3) or SO (sub 4) groups, can be interpreted in terms of thermal expansion, anharmonic coupling, and local strain fluctuations. The three SO (sub 4) stretching bands display a contrasted thermal behavior, the frequency of one of them increasing with temperature. Based on first-principles calculation, this unusual temperature dependence is traced back to the anisotropy of calcite thermal expansion. These results sustain the previously proposed atomic-scale model of sulfate in calcite and attest to a dominantly structural nature of sulfate in the investigated sample. Accordingly, structurally substituted sulfur in deep-sea calcitic bamboo coral could be used as proxy of seawater sulfate.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 29
Serial Issue: 3
Title: Infrared spectroscopic study of sulfate-bearing calcite from deep-sea bamboo coral
Affiliation: Universite Pierre et Marie Curie, Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie, Paris, France
Pages: 397-408
Published: 201706
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 94
Accession Number: 2017-077517
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
S33°00'00" - S33°00'00", E77°00'00" - E77°00'00"
Secondary Affiliation: Universite Paris Diderot, FRA, FranceUniversite Paris-Saclay, FRA, France
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: 201741
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