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X-ray diffraction, infrared and Moessbauer studies of Fe-rich carbonates

Pedro Pablo Gil, Alfonso Pesquera and Francisco Velasco
X-ray diffraction, infrared and Moessbauer studies of Fe-rich carbonates
European Journal of Mineralogy (June 1992) 4 (3): 521-526

Abstract

XRD data indicate a clear variation in unit-cell parameters with composition for siderites and Fe-rich members of the dolomite- ankerite series, although carbonates near to pure siderite show some scattering. IR spectroscopy shows small shifts (< 10 cm (super - 1) ) in the three vibrational frequencies 1420, 870 and 730 cm (super - 1) ; the relationship between composition and the 870 and 730 cm (super -1) bands is approximately linear for siderites but non- linear for ankerites. Mossbauer data reveal the presence of one unique type of site occupancy as well as distortion in FeO (sub 6) octahedra in siderites. Quadrupole splitting and Fe content seem to be independent from each other, but there is some correlation between the amount of Fe and the area of the band exists. The variation for compositions close to pure siderite may be due to the antagonistic effect caused by substitution of Ca and Mg for Fe in octahedral sites.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 3
Title: X-ray diffraction, infrared and Moessbauer studies of Fe-rich carbonates
Affiliation: Universidad del Pais Vasco, Dpto. de Mineralogia y Petrologia, Bilbao, Spain
Pages: 521-526
Published: 199206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 26
Accession Number: 1995-056312
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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