The irradiation history of the Ghubara (L5) regolith breccia

T. E. Ferko, M. S. Wang, D. J. Hillegonds, M. E. Lipschutz, R. Hutchison, L. Franke, P. Scherer, L. Schultz, P. H. Benoit, D. W G Sears, A. K. Singhvi, N. Bhandari

Research output: Contribution to journalArticle

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Abstract

We measured cosmic-ray products-noble gases, radionuclides, thermoluminescence, and nuclear tracks-and trace element contents and mineralogy of samples of three orthogonal and mutually intersecting cores (41-46 cm long) of a 101.6 kg Ghubara individual (1958,805) at The Natural History Museum, London. The xenoliths, like the host, have high concentrations of trapped solar gases and are heavily shocked. While contents of noble gases and degree of shock-loading in this individual and three others differ somewhat, the data indicate that Ghubara is a two-generation regolith breccia. Contents of cosmogenic 26Al and 10Be and low track densities indicate that the Ghubara individuals were located more than 15 cm below the surface of an 85 cm meteoroid. Because of its large size, Ghubara's cosmic-ray exposure age is poorly defined to be 15-20 Ma from cosmogenic nuclides. Ghubara's terrestrial age, based on 14C data, is 2-3 ka. Not only is Ghubara the first known case of a two-generation regolith breccia on the macroscale, it also has a complicated thermal and irradiation history.

Original languageEnglish (US)
Pages (from-to)311-327
Number of pages17
JournalMeteoritics and Planetary Science
Volume37
Issue number3
StatePublished - 2002
Externally publishedYes

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breccia
regolith
noble gas
cosmic ray
irradiation
histories
thermoluminescence
rare gases
cosmic rays
history
museum
radionuclide
museums
mineralogy
meteoroids
trace element
nuclides
trace elements
radioactive isotopes
shock

ASJC Scopus subject areas

  • Geophysics

Cite this

Ferko, T. E., Wang, M. S., Hillegonds, D. J., Lipschutz, M. E., Hutchison, R., Franke, L., ... Bhandari, N. (2002). The irradiation history of the Ghubara (L5) regolith breccia. Meteoritics and Planetary Science, 37(3), 311-327.

The irradiation history of the Ghubara (L5) regolith breccia. / Ferko, T. E.; Wang, M. S.; Hillegonds, D. J.; Lipschutz, M. E.; Hutchison, R.; Franke, L.; Scherer, P.; Schultz, L.; Benoit, P. H.; Sears, D. W G; Singhvi, A. K.; Bhandari, N.

In: Meteoritics and Planetary Science, Vol. 37, No. 3, 2002, p. 311-327.

Research output: Contribution to journalArticle

Ferko, TE, Wang, MS, Hillegonds, DJ, Lipschutz, ME, Hutchison, R, Franke, L, Scherer, P, Schultz, L, Benoit, PH, Sears, DWG, Singhvi, AK & Bhandari, N 2002, 'The irradiation history of the Ghubara (L5) regolith breccia', Meteoritics and Planetary Science, vol. 37, no. 3, pp. 311-327.
Ferko TE, Wang MS, Hillegonds DJ, Lipschutz ME, Hutchison R, Franke L et al. The irradiation history of the Ghubara (L5) regolith breccia. Meteoritics and Planetary Science. 2002;37(3):311-327.
Ferko, T. E. ; Wang, M. S. ; Hillegonds, D. J. ; Lipschutz, M. E. ; Hutchison, R. ; Franke, L. ; Scherer, P. ; Schultz, L. ; Benoit, P. H. ; Sears, D. W G ; Singhvi, A. K. ; Bhandari, N. / The irradiation history of the Ghubara (L5) regolith breccia. In: Meteoritics and Planetary Science. 2002 ; Vol. 37, No. 3. pp. 311-327.
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