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Determination of molar absorptivities for infrared absorption bands of H₂O in andesitic glasses

¹ American Museum of of Natural History, Central Park West at 79th St. New York, New York 10024-5192, U.S.A.
² Department of Geological Sciences, Brown University, Box 1846, Providence, Rhode Island 02912, U.S.A.
³ Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A0E8, Canada
⁴ Institute of Geological & Nuclear Sciences, 30 Gracefield Rd. Lower Hutt, New Zealand

Correspondence: ^* E-mail: cmandy{at}amnh.org

We have determined infrared molar absorptivities for water absorption bands in Fe-bearing and Fe-free andesitic glasses. Water dissolves in andesitic glasses as both hydroxyl groups and molecular water as observed in other silicate glasses. Concentrations of molecular water and hydroxyl species are a strong function of total water content. IR molar absorptivities for Fe-bearing andesite are ₃₅₇₀ = 62.32 ± 0.42 L/mol·cm, ₄₅₀₀ = 0.79 ± 0.07 L/mol·cm, ₅₂₀₀ = 1.07 ± 0.07 L/mol·cm, and ₁₆₃₀ = 42.34 ± 2.77 L/mol·cm. Molar absorptivities for Fe-free andesite are 69.21 ± 0.52 L/mol·cm for ₃₅₇₀, 0.89 ± 0.07 L/mol·cm for ₄₅₀₀, 1.46 ± 0.07 L/mol·cm for ₅₂₀₀, and 52.05 ± 2.85 L/mol·cm for ₁₆₃₀. Molar absorptivities show significant compositional dependencies that can be predicted based on tetrahedral cation (Si⁺⁴, Al⁺³)/total cation fraction.

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