Abstract
Kapoeta is an achondrite meteorite containing mm-sized carbonaceous-chondrite inclusions that are thought to have been incorporated into its parent body by carbonaceous-chondrite impactors (mainly CM “Mighei-type” material). Two different samples (A and B) of the Kapoeta carbonaceous-chondrite materials are studied by Mössbauer spectroscopy at room temperature. The Mössbauer spectra are fitted with a combination of Fe2+ and Fe3+ quadrupole doublets using a Voigt-based function. The spectrum of sample A shows two Fe2+ doublets and one Fe3+ doublet, with Fe3+ accounting for 64% of the total spectral area, and are ascribed to hydrated phyllosilicates. Sample-B spectrum, on the other hand, shows three doublets that are due to Fe2+ only, and are attributed mainly to amorphous silicates (predominantly dehydrated amorphous phyllosilicates) and presence of small amounts of olivine. The results are compared with published Mössbauer data on carbonaceous chondrites, and discussed in relation to aqueous alteration that occurred in their parent bodies and the thermal history the Kapoeta meteorite.
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References
Brearly, A.J., Jones, R.H.: Chondritic Meteorites. In: Papike, J. (ed.) Reviews in Mineralogy: Planetary Materials, vol. 36, pp. 3-1–3-398. Washington, D.C., Mineralogical Society of America (1998)
Fujiya, W., Sugiura, N., Hotta, H., Ichimura, K., Sano, Y.: Evidence for the late formation of hydrous asteroids from young meteoritic carbonates. Nat. Commun. 3, 627 (2012)
Zolensky, M.E., Weisberg, M.K., Buchanan, P.C., Mittlefehldt, D.W.: Mineralogy of carbonaceous chondrite clasts in HED achondrites and the moon. Meteorit. Planet. Sci. 31, 518–537 (1996)
Malysheva, T.V.: The kinetics or reduction of carbonaceous meteorites: Mössbauer study. Journal de Physique Colloques. 41(C1), C1-405–C1-406 (1980)
Hoffman, E., Seifu, D., Oliver, F.W.: Axtell and Allende: a Mössbauer spectroscopic study. Meteorit. Planet. Sci. 35, 431–434 (2000)
Bland, P.A., Cressey, G., Menzies, O.N.: Modal mineralogy of carbonaceous chondrites by X-ray diffraction and Mössbauer spectroscopy. Meteorit. Planet. Sci. 39, 3–16 (2004)
Tripathi, R.P., Dixit, A., Bhandari, N.: Characterization of Mukundpura carbonaceous chondrite. Curr. Sci. 114, 214–217 (2018)
Sephton, M.A., Bland, P.A., Pillinger, C.T, Gilmour, I.: The preservation state of organic matter in meteorites from Antarctica. Meteorit. Planet. Sci. 39, 747–754 (2004)
Fredriksson, K., Keil, K.: The light-dark structure in the Pantar and Kapoeta stone meteorites. Geochim. Cosmochim. Acta. 27, 717–739 (1963)
Rancourt, D.G., Ping, J.Y.: Voigt-based methods for arbitrary-shape static hyperfine parameter distributions in Mössbauer spectroscopy. Nucl. Inst. Methods Phys. Res. B. 58, 85–97 (1991)
Gismelseed, A.M., Khangi, F., Ibrahim, A., Yousif, A.A., Worthing, M.A., Rais, A., Elzain, M.E., Brooks, C.K., Sutherland, H.H.: Studies on AI Kidirate and Kapoeta meteorites. Hyperfine Interact. 91, 551–555 (1994)
Abdu, Y.A., Hawthorne, F.C.: Mössbauer spectroscopy of pyroxene in the light-dark structure of the Kapoeta meteorite: implications for thermal history of the Kapoeta parent body. J. Phys. Conf. Ser. 869, 012096 (2017)
Abdu, Y.A., Souza Azevedo, I., Stewart, S.J., López, A., Varela, M.E., Kurat, G., Scorzelli, R.B.: Mössbauer study of glasses in meteorites: the D’Orbigny angrite and Cachari eucrite. Hyperfine Interact. 166, 543–547 (2005)
Abdu, Y.A., Hawthorne, F.C., Varela, M.E.: Infrared spectroscopy of carbonaceous-chondrite inclusions in the Kapoeta meteorite: discovery of nanodiamonds with new spectral features and astrophysical implications. Astrophys. J. Lett. 856, L9 (7 pp) (2018)
King, A.J., Schofield, P.F., Russell, S.S.: Thermal alteration of CM carbonaceous chondrites: mineralogical changes and metamorphic temperatures. Geochim. Cosmochim. Acta. 298, 167–190 (2021)
Rao, M.N., Garrison, D.H., Palma, R.L., Bogard, D.D.: Energetic proton irradiation history of the howardite parent body regolith and implications for ancient solar activity. Meteorit. Planet. Sci. 32, 531–543 (1997)
Acknowledgments
I am grateful to Frank C. Hawthorne for access to the Mössbauer spectroscopy facility in the Department of Geological Sciences, University of Manitoba. I acknowledge the support of the University of Sharjah grant number 2002143088.
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This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2021), 5-10 September 2021, Brasov, Romania
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Abdu, Y.A. Carbonaceous-chondrite inclusions in the Kapoeta achondritic meteorite studied by Mössbauer spectroscopy. Hyperfine Interact 242, 5 (2021). https://doi.org/10.1007/s10751-021-01729-3
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DOI: https://doi.org/10.1007/s10751-021-01729-3