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 

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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
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    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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