Carbonates in Antarctic ordinary chondrites inferred from infrared diffuse reflectance spectra

Physics

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Antarctic Regions, Carbonates, Chondrites, Infrared Spectra, Reflectance, Absorption Spectra, Wave Functions

Scientific paper

Examination of Antarctic ordinary chondrites was made through use of infrared diffuse reflectance spectroscopy. The spectra of all the Antarctic ordinary chondrites measured show weak absorption bands near 1350/cm which are caused by carbonates (probably hydrated carbonates). The band is not present after acid dissolution, consistent with the carbonate identification. The carbonates were probably produced by terrestrial weathering, since the spectra of recently fallen non-Antarctic chondrites, Nuevo Mercurio (H5) and La Criolla (L6), do not show the 1350/cm band. Infrared diffuse reflectance spectroscopy is useful for easily detecting the presence (or absence) of the weathering-produced carbonates in meteorites.

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