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Abstract
A number of meteorites from the desert of Oman, classified as H-chondrites, with known and unknown ages, were studied by using 57Fe Mössbauer spectroscopy to determine their Fe3+-bearing compositions. Mössbauer spectra measured at 78 K were composed of paramagnetic doublets superimposed on magnetic sextets. The doublets are assigned to the silicate minerals olivine and pyroxene and Fe3+ phases. The magnetic sextets in most samples showed the presence of at least three magnetic phases, namely troilite, magnetite and kamacite, which commonly exist in most ordinary chondrites. The relative amounts (area %) of Fe3+ in the known-age meteorites, determined from the Mössbauer spectra, were plotted against their terrestrial ages. The plot was used to estimate the terrestrial ages of meteorites with unknown terrestrial age.
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References
- Al-Kathiri, A., Hofmann, B.A., Jull, A.J.T., and Gnos, E., Meteoritics and Planetary Science, 2005, 40, 1215.
- Norton, O.R., 2002: The Cambridge encyclopedia of meteorites. Cambridge University Press UK. 352pp.
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- Rubin, A.E., Meteoritics and Planetary Science. 1997, 32, 231-247.
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- Bland, P.A., Sexton, A.S., Jull, A.J.T., Bevan, A.W.R., Berry, F.J., Thornley, D.M., Astin, T.R., Britt, D.T., and Pillinger, C.T., Geochimica et Cosmochimica Acta,1998, 62, 3169-3184.
- Bland, P.A., Berry, F.J., Jull, A.J.T., Smith, T.B., Bevan, A.W.R., Cadogan, J.M., Sexton, A.S., Franchi, L.A., and Pillinger, C.T., Hyperfine Interactions, 2002, 142, 481-494.
- Cadogan, J.M., Rebbouh, L., Mills, J.V.J. and Bland, P.A. Devlin EJ, Hyperfine Interactions, 222, (Suppl 2):S91-S98, 2013.
- Al-Rawas, A.D., Gismelseed, A.M., Yousif, A.A., Elzain, M.E., Worthing, M.A., Al-Kathiri, A., Gnos, E., Hofmann, B.A., and Steele, D.A., Planetary and Space Science, 2007, 55, 859-863.
- Meteoritical Bulletin, no. 101, MAPS 50, 1661, September (2015).
- Meteoritical Bulletin, no. 103, MAPS 52, 1014, May (2017).
- Buchwald, V.F. and Clarke, R.S., American Mineralogist, 1989, 74, 657-667.
References
Al-Kathiri, A., Hofmann, B.A., Jull, A.J.T., and Gnos, E., Meteoritics and Planetary Science, 2005, 40, 1215.
Norton, O.R., 2002: The Cambridge encyclopedia of meteorites. Cambridge University Press UK. 352pp.
Al-Kathiri, A., Studies on Oman Meteorites, PhD Thesis, University of Bern (2006).
Knudsen, J.M., Hyperfine Interactions, 1989, 47, 3-31.
Rubin, A.E., Meteoritics and Planetary Science. 1997, 32, 231-247.
Gismelseed, A.M., Bashir, S., Worthing, M.A., Yousif, A.A., Elzain, M.E., Al Rawas, A.D., Meteoritics and Planetary Science, 2005, 40, 255-259.
Bland, P.A., Sexton, A.S., Jull, A.J.T., Bevan, A.W.R., Berry, F.J., Thornley, D.M., Astin, T.R., Britt, D.T., and Pillinger, C.T., Geochimica et Cosmochimica Acta,1998, 62, 3169-3184.
Bland, P.A., Berry, F.J., Jull, A.J.T., Smith, T.B., Bevan, A.W.R., Cadogan, J.M., Sexton, A.S., Franchi, L.A., and Pillinger, C.T., Hyperfine Interactions, 2002, 142, 481-494.
Cadogan, J.M., Rebbouh, L., Mills, J.V.J. and Bland, P.A. Devlin EJ, Hyperfine Interactions, 222, (Suppl 2):S91-S98, 2013.
Al-Rawas, A.D., Gismelseed, A.M., Yousif, A.A., Elzain, M.E., Worthing, M.A., Al-Kathiri, A., Gnos, E., Hofmann, B.A., and Steele, D.A., Planetary and Space Science, 2007, 55, 859-863.
Meteoritical Bulletin, no. 101, MAPS 50, 1661, September (2015).
Meteoritical Bulletin, no. 103, MAPS 52, 1014, May (2017).
Buchwald, V.F. and Clarke, R.S., American Mineralogist, 1989, 74, 657-667.