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Abstract

Biogenic calcites show various chemical contents (Sr and Mg) related to the systematic position of the organisms. It is well known that algae, octocorallia, and echinoderm tests are composed of high Mg calcites, whereas mollusc shells are composed of lower Mg calcites. DRIFT (diffuse reflectance infrared Fourier transform) spectra show that the frequency of the ν₄ band significantly differs in the high Mg calcite and low-Mg calcite set. The ν₁ band and the doublet ν₂ do not seem to be altered. There is a strong positive linear correlation between the ν₄ wavelength and Mg concentrations in these biological calcites. The linear correlation between the ν₄ wavelength and Sr concentrations is only 0.59. It is known that the calcite dolomite transition shifts the wavelength of the ν₄ band, but such a shift has not been observed in the single calcite.

Keywords

FT-IR EDS Biogenic calcites

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Infrared Spectra and Elemental Composition in Recent Biogenic Calcites: Relationships between the ν 4 Band Wavelength and Sr and Mg Concentrations

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