Cosmic ray exposure and pre-atmospheric size of the Gebel Kamil iron meteorite

U. Ott, S. Merchel, S. Herrmann, S. Pavetich, G. Rugel, T. Faestermann, L. Fimiani, J. M. Gomez-Guzman, K. Hain, G. Korschinek, P. Ludwig, M. D'Orazio, L. Folco

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Cosmogenic He, Ne, and Ar as well as the radionuclides 10Be, 26Al, 36Cl, 41Ca, 53Mn, and 60Fe have been determined on samples from the Gebel Kamil ungrouped Ni-rich iron meteorite by noble gas mass spectrometry and accelerator mass spectrometry (AMS), respectively. The meteorite is associated with the Kamil crater in southern Egypt, which is about 45 m in diameter. Samples originate from an individual large fragment ("Individual") as well as from shrapnel. Concentrations of all cosmogenic nuclides-stable and radioactive-are lower by a factor 3-4 in the shrapnel samples than in the Individual. Assuming negligible 36Cl decay during terrestrial residence (indicated by the young crater age 36Cl-36Ar cosmic ray exposure age (CRE) of approximately (366 ± 18) Ma (systematic errors not included). Both noble gases and radionuclides point to a pre-atmospheric radius >85 cm, i.e., a pre-atmospheric mass >20 tons, with a preferred radius of 115-120 cm (50-60 tons). The analyzed samples came from a depth of approximately 20 cm (Individual) and approximately 50-80 cm (shrapnel). The size of the Gebel Kamil meteoroid determined in this work is close to estimates based on impact cratering models combined with expectations for ablation during passage through the atmosphere (Folco et al. , ).

Original languageEnglish
Pages (from-to)1365-1374
Number of pages10
JournalMeteoritics and Planetary Science
Volume49
Issue number8
DOIs
Publication statusPublished - 2014

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iron meteorites
iron meteorite
shrapnel
noble gas
cosmic ray
crater
radionuclide
cosmic rays
cratering
accelerator mass spectrometry
craters
ablation
meteorite
radioactive isotopes
rare gases
mass spectroscopy
mass spectrometry
Egypt
radii
atmosphere

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Ott, U., Merchel, S., Herrmann, S., Pavetich, S., Rugel, G., Faestermann, T., ... Folco, L. (2014). Cosmic ray exposure and pre-atmospheric size of the Gebel Kamil iron meteorite. Meteoritics and Planetary Science, 49(8), 1365-1374. https://doi.org/10.1111/maps.12334

Cosmic ray exposure and pre-atmospheric size of the Gebel Kamil iron meteorite. / Ott, U.; Merchel, S.; Herrmann, S.; Pavetich, S.; Rugel, G.; Faestermann, T.; Fimiani, L.; Gomez-Guzman, J. M.; Hain, K.; Korschinek, G.; Ludwig, P.; D'Orazio, M.; Folco, L.

In: Meteoritics and Planetary Science, Vol. 49, No. 8, 2014, p. 1365-1374.

Research output: Contribution to journalArticle

Ott, U, Merchel, S, Herrmann, S, Pavetich, S, Rugel, G, Faestermann, T, Fimiani, L, Gomez-Guzman, JM, Hain, K, Korschinek, G, Ludwig, P, D'Orazio, M & Folco, L 2014, 'Cosmic ray exposure and pre-atmospheric size of the Gebel Kamil iron meteorite', Meteoritics and Planetary Science, vol. 49, no. 8, pp. 1365-1374. https://doi.org/10.1111/maps.12334
Ott, U. ; Merchel, S. ; Herrmann, S. ; Pavetich, S. ; Rugel, G. ; Faestermann, T. ; Fimiani, L. ; Gomez-Guzman, J. M. ; Hain, K. ; Korschinek, G. ; Ludwig, P. ; D'Orazio, M. ; Folco, L. / Cosmic ray exposure and pre-atmospheric size of the Gebel Kamil iron meteorite. In: Meteoritics and Planetary Science. 2014 ; Vol. 49, No. 8. pp. 1365-1374.
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