Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy

The crystal structure of druse clinopyroxene from the D'Orbigny angrite, (Ca0.944 Fe 2+ 0.042 Mg0.010Mn0.004) (Mg0.469Fe 2+ 0.317Fe 3+ 0.035Al0.125Cr0.010Ti0.044) (Si1.742Al0.258) O6, a = 9.7684(2), b = 8.9124(2), c = 5.2859(1) A, β = 105.903(1)°, V = 442.58 A 3 , space group C2/c, Z = 2, has b...

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Autores principales: Abdu, Yassir A., Scorzelli, R. B., Varela, Maria Eugenia, Kurat, Gero, Souza Azevedo, Izabel de, Stewart, Silvana Jacqueline, Hawthorne, Frank C.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Geofísica
Crystal structure
Electron microprobe
Chemistry
Diffraction
Druse (geology)
Spectral line
X-ray crystallography
Mössbauer spectroscopy
Single crystal
Crystallography
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127036
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127036
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geofísica
Crystal structure
Electron microprobe
Chemistry
Diffraction
Druse (geology)
Spectral line
X-ray crystallography
Mössbauer spectroscopy
Single crystal
Crystallography
spellingShingle Geofísica
Crystal structure
Electron microprobe
Chemistry
Diffraction
Druse (geology)
Spectral line
X-ray crystallography
Mössbauer spectroscopy
Single crystal
Crystallography
Abdu, Yassir A.
Scorzelli, R. B.
Varela, Maria Eugenia
Kurat, Gero
Souza Azevedo, Izabel de
Stewart, Silvana Jacqueline
Hawthorne, Frank C.
Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy
topic_facet Geofísica
Crystal structure
Electron microprobe
Chemistry
Diffraction
Druse (geology)
Spectral line
X-ray crystallography
Mössbauer spectroscopy
Single crystal
Crystallography
description The crystal structure of druse clinopyroxene from the D'Orbigny angrite, (Ca0.944 Fe 2+ 0.042 Mg0.010Mn0.004) (Mg0.469Fe 2+ 0.317Fe 3+ 0.035Al0.125Cr0.010Ti0.044) (Si1.742Al0.258) O6, a = 9.7684(2), b = 8.9124(2), c = 5.2859(1) A, β = 105.903(1)°, V = 442.58 A 3 , space group C2/c, Z = 2, has been refined to an R1 index of 1.92% using single-crystal X-ray diffraction data. The unit formula, calculated from electron microprobe analysis, and the refined site scattering values were used to assign site populations. The distribution of Fe 2+ and Mg over the M1 and M2 sites suggests a closure temperature of 1000 °C. Mossbauer spectroscopy measurements were done at room temperature on a single crystal and a powdered sample. The spectra are adequately fit by a Voigt-based quadrupole-splitting distribution model having two generalized sites, one for Fe 2+ with two Gaussian components and one for Fe 3+ with one Gaussian component. The two ferrous components are assigned to Fe 2+ at the M1 site, and arise from two different next-nearest-neighbor configurations of Ca and Fe cations at the M2 site: (3Ca,0Fe) and (2Ca,1Fe). The Fe 3+ /Fetot ratio determined by Mossbauer spectroscopy is in agreement with that calculated from the electron microprobe analysis. The results are discussed in connection with the redox and thermal history of D'Orbigny.
format Articulo
Articulo
author Abdu, Yassir A.
Scorzelli, R. B.
Varela, Maria Eugenia
Kurat, Gero
Souza Azevedo, Izabel de
Stewart, Silvana Jacqueline
Hawthorne, Frank C.
author_facet Abdu, Yassir A.
Scorzelli, R. B.
Varela, Maria Eugenia
Kurat, Gero
Souza Azevedo, Izabel de
Stewart, Silvana Jacqueline
Hawthorne, Frank C.
author_sort Abdu, Yassir A.
title Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy
title_short Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy
title_full Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy
title_fullStr Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy
title_full_unstemmed Druse clinopyroxene in D'Orbigny angritic meteorite studied by single-crystal X-ray diffraction, electron microprobe analysis and Mössbauer spectroscopy
title_sort druse clinopyroxene in d'orbigny angritic meteorite studied by single-crystal x-ray diffraction, electron microprobe analysis and mössbauer spectroscopy
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/127036
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bdutipo_str Repositorios
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