Exposure history of H5 chondrite Gujargaon

Details Exposure history of H5 chondrite Gujargaon Exposure history of H5 chondrite Gujargaon

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988metic..23..103b&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 23, June 1988, p. 103-106. BMFT-DFVLR-ISRO-supported research.

Computer Science

1

Chondrites, Cosmic Rays, Irradiation, Meteoritic Composition, Ablation, Atmospheric Entry, Helium Isotopes, Neon Isotopes, Radioactive Isotopes

Scientific paper

Cosmic-ray-produced tracks, He and Ne isotopes, and radionuclides have been studied in the recently fallen H5 chondrite Gujargaon. The results indicate an exposure age of about 7 Ma. The high track production rates of 0.25 to 690,000/sq cm per Ma suggest that the Gujargaon meteoroid had a small size, R(E) = 9-10 cm, in space and suffered 1-3 cm ablation in the atmosphere. The conclusion about the meteoroid size is supported by the low activity of neutron capture isotope Co-60 and high spallogenic Ne-22/Ne-21 ratio of about 1.25. The data on long lived isotopes Be-10, Mn-53, and Al-26 are used to derive production rates of these isotopes in a rock having a radius of 9 cm, and the activity levels of the short lived isotopes Na-22 and Mn-54 are used to estimate the effect of modulation of galactic cosmic rays at the time of solar maximum of 1982.

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