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Octahedral cation distribution in glauconites from Southern Urals by combination of crystal-chemical model and quasi-continuous model-independent quadrupole splitting distributions (QSD) fitted to their Mossbauer spectra

Lidia G. Dainyak, Viacheslav S. Rusakov, Ivan A. Sukhorukov and Victor A. Drits
Octahedral cation distribution in glauconites from Southern Urals by combination of crystal-chemical model and quasi-continuous model-independent quadrupole splitting distributions (QSD) fitted to their Mossbauer spectra
European Journal of Mineralogy (September 2013) 25 (3): 405-414

Abstract

Mossbauer spectra of two glauconites, BSH-11 and KUL-1, from the Southern Urals are interpreted by simulation using crystal-chemical modelling and by fitting of quadrupole splitting distribution (QSD). The crystal-chemical modelling is based on X-ray diffraction (XRD) data and includes, as a priori information, individual quadrupole splittings for Fe (super 3+) and for Fe (super 2+) that correspond to specific local cation arrangements (LCA) having certain occurrence probabilities. The latter are provided by two-dimensional octahedral cation distribution using integrated infrared optical densities for bands corresponding to the cation pairs bound to the OH groups. Combination of crystal-chemical modelling and quasi-continuous model-independent QSDs fitted to Mossbauer spectra resulted in cation distributions for which R (super 2+) (Mg, Fe (super 2+) ) and R (super 3+) (Al, Fe (super 3+) ) cations occupy one of two structurally independent cis-sites with equal probabilities. The cation distributions obtained are characterized by Fe-clustering, domain structure, and different trends to homogeneous charge dispersion.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 3
Title: Octahedral cation distribution in glauconites from Southern Urals by combination of crystal-chemical model and quasi-continuous model-independent quadrupole splitting distributions (QSD) fitted to their Mossbauer spectra
Affiliation: Russian Academy of Science, Geological Institute, Moscow, Russian Federation
Pages: 405-414
Published: 201309
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 44
Accession Number: 2013-083991
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Secondary Affiliation: Lomonosov Moscow State University, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201349
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