Determination of quantitative cation distribution in orthopyroxenes from electronic absorption spectra View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1979-03

AUTHORS

Don S. Goldman, George R. Rossman

ABSTRACT

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 Fe2+ 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 Fe2+ distribution produced during heating experiments and confirm earlier results from Mössbauer spectra. Two components of the spin-allowed transition of Fe2+ 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) Fe2+ 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) Fe2+ concentration (ɛ=40.8), but deviates from linearity at high iron concentrations. The origins of spin-forbidden transitions in the visible region are examined. More... »

PAGES

43-53

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00308358

DOI

http://dx.doi.org/10.1007/bf00308358

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1020738811


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