Room temperature 57Fe Mössbauer spectroscopy of ordinary chondrites from the Atacama Desert (Chile): constraining the weathering processes on desert meteorites
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2008-04Metadata
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Valenzuela, M.
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Room temperature 57Fe Mössbauer spectroscopy of ordinary chondrites from the Atacama Desert (Chile): constraining the weathering processes on desert meteorites
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Abstract
We report the results of a study on the weathering products of 21 meteorites
found in the Atacama Desert (Chile) using room temperature 57Fe Mössbauer spectroscopy
(MS). The meteorites are weathered ordinary chondrites (OCs) with unknown terrestrial
ages and include the three chemical groups (H, L, and LL). We obtained the percentage of
all the Fe-bearing phases for the primary minerals: olivine, pyroxene, troilite and Fe–Ni
metal, and for the ferric alteration products (composed of the paramagnetic Fe3+ component
and the magnetically ordered Fe3+ components) which gives the percentage of oxidation of
the samples. From the Mössbauer absorption areas of these oxides, the terrestrial oxidation
of the Atacama OC was found in the range from ~5% to ~60%. The amount of silicates as
well as the opaques decreases at a constant rate with increasing oxidation level.
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URI: https://repositorio.uchile.cl/handle/2250/125228
ISSN: 0304-3843 (Print) 1572-9540 (Online)
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Hyperfine Interactions, Volume 175, Numbers 1-3, pp. 9-14,2008
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