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57Fe Mössbauer study of the chainpur meteorite

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Abstract

The Chainpur meteorite is one of 23 ordinary chondrites classified as LL3-type (low-Fe & low-metal). It was observed as a shower of stones falling on May 9, 1907 in Uttar Pradesh, India. We report here the characterization of the Fe-bearing phases in this chondrite using 57Fe Mössbauer spectroscopy carried out at 298 K, 120 K, 50 K and 13 K. The paramagnetic doublets of olivine and pyroxene dominate the room temperature spectrum, accounting for around 70 % of the spectral area. Moreover, a doublet present with a spectral area of 5 % and assigned to a superparamagnetic Fe 3+ phase is a consequence of terrestrial weathering. On the basis of the measured 57Fe electric quadrupole splitting of the olivine component at room temperature we estimate the mean Fe:Mg ratio in this meteoritic olivine to be around 35:65 % although there is clearly a wide range of composition. The effects of magnetic ordering of the major components olivine and pyroxene are observed at 13 K.

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Authors and Affiliations

  1. School of Physical, Environmental and Mathematical Sciences, The University of New South Wales at the Australian Defence Force Academy, Canberra, ACT, 2610, Australia

    Nancy N. Elewa, R. Cobas & J. M. Cadogan

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  1. Nancy N. Elewa
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  2. R. Cobas
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  3. J. M. Cadogan
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Correspondence to Nancy N. Elewa.

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This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016), Leuven, Belgium, 3-8 July 2016

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Elewa, N.N., Cobas, R. & Cadogan, J.M. 57Fe Mössbauer study of the chainpur meteorite. Hyperfine Interact 237, 107 (2016). https://doi.org/10.1007/s10751-016-1315-4

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  • DOI: https://doi.org/10.1007/s10751-016-1315-4

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