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Nanophase mixed-valence iron minerals in meteorites identified by cryogenic Mössbauer spectroscopy

  • Geology, Mineralogy, and Archeology
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Abstract

Determination of oxidation states and the crystal chemistry of iron-bearing minerals in carbonaceous chondrites by Mössbauer spectroscopy is complicated by thermally-induced electron-hopping in cronstedtite, superparamagnetism of hydrous ferric oxides and ill-defined contributions from an incommensurate layered iron sulfide phase believed to be tochilinite. Mössbauer spectra measurements at 30 K of several terrestrial cronstedtite and tochilinite specimens have enables modal proportions of these minerals, as well as Fe3+/Fe2+ ratios, to be determined quantitatively in a suite of CM-type meteorites.

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Authors and Affiliations

  1. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

    Roger G. Burns & Duncan S. Fisher

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  1. Roger G. Burns
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  2. Duncan S. Fisher
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Burns, R.G., Fisher, D.S. Nanophase mixed-valence iron minerals in meteorites identified by cryogenic Mössbauer spectroscopy. Hyperfine Interact 91, 571–576 (1994). https://doi.org/10.1007/BF02064572

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