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Hyperfine Interactions

, Volume 67, Issue 1–4, pp 463–466 | Cite as

Analysis of impact-induced Fe2+ disorder in the pyroxene of the Ibitira meteorite

  • T. V. V. Costa
  • V. W. Vieira
  • M. A. B. de Araújo
Mineralogy, Geology and Archeology

Abstract

Mössbauer spectroscopy and X-ray diffraction analysis indicate that the only iron compound present in the Ibitira meteorite is the pyroxene (Mg, Fe, Ca)2Si2O6 known as pigeonite [1]. The Mössbauer spectrum shows Fe2+ in the two different crystallographic sites, M1 and M2, and the population ratio Fe2+ (M1)/Fe2+ (M2) indicates a reasonable degree of cation order. Comparison between our results and results obtained from pyroxene shocked under controlled conditions in the laboratory [2] suggests that, the meteorite was subjected to a impact of low intensity.

Keywords

Iron Spectroscopy Thin Film Diffraction Analysis Iron Compound 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    T.V.V. Costa, V.W. Vieira and M.A.B. de Araújo, Physica Scripta 40 (1989) 702ADSGoogle Scholar
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    R.W. Dundon and S.S. Hafne, Science 174 (1971) 581.ADSGoogle Scholar
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    C.B. Gomes and K. Keil,Brazilian Stone Meteorites (University of New Mexico Press, 1980).Google Scholar
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    R.W. Dundon and L.S. Walter, Earth Planet. Sci. Lett. 2 (1967) 372CrossRefADSGoogle Scholar
  5. [5]
    R.F. Mueller, Mineral Soc. Am. Spec. Pap. 2 (1969) 83.Google Scholar

Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1991

Authors and Affiliations

  • T. V. V. Costa
    • 1
  • V. W. Vieira
    • 1
  • M. A. B. de Araújo
    • 1
  1. 1.Departmento de FísicaUniversidade Federal do CearáFortalezaBrasil

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