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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References
Jarosewich, E.: Chemical analyses of meteorites: a compilation of stony and iron meteorite analyses. Meteoritics 25, 323–337 (1990)
Clayton, R.N., et al.: Oxygen isotope studies of ordinary chondrites. Geochim. et Cosmochim. Acta 55, 2317–2337 (1991)
McSween, H.Y., et al.: The mineralogy of ordinary chondrites and implications for asteroid spectrophotometry. Icarus 90, 107–116 (1991)
Kallemeyn, G.W., et al.: Ordinary chondrites: bulk compositions, classifications, lithophile-element fractionations, and composition-petrographic type relationships. Geochim. et Cosmochim. Acta 53, 2747–2767 (1989)
Jull, A.J.T., et al.: Carbon-14 activities in recently fallen meteorites and Antarctic meteorites. Geochim. et Cosmochim. Acta 53, 2095–2100 (1989)
Nishiizumi, K., et al.: Update on terrestrial ages of Antarctic meteorites. Earth Planet. Sci. Lett. 93, 299–313 (1989)
Dunai, T.J., et al.: Oligocene–Miocene age of aridity in the Atacama Desert revealed by exposure dating of erosion-sensitive landforms. Geology 33, 321–324 (2005)
Arancibia, G., et al.: K–Ar and 40Ar/39Ar geochronology of supergene processes in the Atacama Desert, Northern Chile: tectonic and climatic relations. J. Geol. Soc. 163, (1), 107–118 (2006)
Brand, R. A.: NORMOS, Mössbauer fitting program (1992)
Valenzuela, M. et al.: Estudio de la meteorización de tres condritos ordinarios del Desierto de Atacama (N. Chile) a través de MEB, DRX y espectroscopía Mössbauer. Paper presented at the XI Congreso Geológico Chileno, Antofagasta, Chile, 7–11 August 2006 (2006)
Valenzuela, E.M. et al.: Weathering of ordinary chondrites from the Atacama Desert, Chile: first results from Mössbauer spectroscopy. Paper presented at the 69TH Annual Meeting of the Meteoritical Society, Zürich, 6–11 August 2006 (2006)
Bland, P.A., et al.: Climate and rock weathering: a study of terrestrial age dated ordinary chondritic meteorites from hot desert regions. Geochim. Cosmochim. Acta 62, 3169–3184 (1998)
Bland, P.A., et al.: 57Fe Mössbauer spectroscopy studies of meteorites: implications for weathering rates, meteorite flux, and early solar system processes. Hyperfine interact. 142, 481–494 (2003)
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Valenzuela, M., Abdu, Y., Scorzelli, R.B., Duttine, M., Morata, D., Munayco, P. (2008). Room temperature 57Fe Mössbauer spectroscopy of ordinary chondrites from the Atacama Desert (Chile): constraining the weathering processes on desert meteorites. In: Larica, C., Mercader, R.C., Partiti, C., Gancedo, J.R. (eds) LACAME 2006. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85559-0_2
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DOI: https://doi.org/10.1007/978-3-540-85559-0_2
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