Determination of the Molar Absorptivity of Dissolved Carbonate in Basanitic Glass

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Abstract

Basanitic glasses with known dissolved C concentrations have been analyzed using infrared spectroscopy to calibrate the molar absorptivity of carbonate. C is dissolved as carbonate complexes in the glass resulting in absorption bands at 1525 and 1425 cm −1 . Molar absorptivities of 283 ± 8 L/(mol·cm) were determined for both 1525 and 1425 cm −1 absorption bands. An integrated molar absorptivity of 60000 ± 1700 L/(mol·cm 2 ) was determined using the integrated area under the doublet. These values are about 20–25% lower than those determined for tholeiitic and leucititic glasses and are intermediate between values characteristic of Na- and Ca-rich silicate glasses. Carbonate molar absorptivities for a range of basaltic glass compositions correlate with the molar ratio of Na/(Na + Ca).

Original languageAmerican English
JournalAmerican Mineralogist
Volume80
DOIs
StatePublished - Dec 1 1995
Externally publishedYes

Keywords

  • absorption
  • basanite
  • carbonates
  • glasses
  • igneous rocks
  • infrared spectra
  • solutes
  • spectra
  • volcanic glass
  • volcanic rocks
  • molar

Disciplines

  • Life Sciences

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