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Determination of Quantitative Cation Distribution in Orthopyroxenes From Electronic Absorption Spectra

Goldman, Don S. and Rossman, George R. (1979) Determination of Quantitative Cation Distribution in Orthopyroxenes From Electronic Absorption Spectra. Physics and Chemistry of Minerals, 4 (1). pp. 43-53. ISSN 0342-1791. doi:10.1007/BF00308358.

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Electronic and Mössbauer absorption spectra and electron microprobe data are correlated for iron-bearing orthopyroxenes. The correlation provides a means of quantitatively determining the distribution of Fe^2+ between the M(1) and M(2) sites of orthopyroxene crystals from electronic spectra and electron microprobe analysis. The electronic spectra are used to analyze the changes in the Fe^2+ distribution produced during heating experiments and confirm earlier results from Mössbauer spectra. Two components of the spin-allowed transition of Fe^2+ in the M(1) site are identified at about 13,000 cm^(−1) and 8,500 cm^(−1) in γ. Molar absorptivity (ɛ) values for all spin-allowed Fe2+ absorption bands in the near-infrared region are determined. The M(2) Fe^2+ band at ∼5,000 cm^(−1) in β is the analytically most useful for site occupancy determinations. It remains linear with concentration (ɛ=9.65) over the entire compositional range. The band at ∼10,500 cm^(−1) in α is the most sensitive to M(2) Fe^2+ concentration (ɛ=40.8), but deviates from linearity at high iron concentrations. The origins of spin-forbidden transitions in the visible region are examined.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1979 Springer. Received April 14, 1978. We thank J. Huneke (Caltech) and S. Ghose (University of Washington) for providing the hypersthene and eulite crystals used in this study. We also thank Wayne A. Dollase (University of California, Los Angeles) for obtaining the 77 K. Mössbauer spectra. A portion of this study was funded by the National Science Foundation, Grant EAR 76-02014.
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NSFEAR 76-02014
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Caltech Division of Geological and Planetary Sciences3058
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ID Code:38338
Deposited On:08 May 2013 14:30
Last Modified:09 Nov 2021 23:36

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