Computer Science
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..89...15e&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 89, no. 1, June 1988, p. 15-27. SNSF-supported research.
Computer Science
10
Earth Surface, Isotopes, Lunar Crust, Meteoritic Composition, Rare Gases, Cosmic Rays, Earth-Moon System, Regolith, Transit Time
Scientific paper
The isotope abundances of He, Ne, Ar, Kr, and Xe were analyzed in bulk samples and grain-size fractions of the lunar meteorites Yamato (Y)-82192 and Y-82193, and the terrestrial ages of these meteorites and their history of exposure to cosmic rays were estimated. The two latter parameters were found to be very similar for both meteorites, confirming the suggestion of Yanai et al. (1986), made on the basis of chemical composition, mineralogy, and texture studies, that the Y-82192 and Y-82193 meteorites are a paired fall. Comparison of data on the terrestrial age and the total galactic cosmic-ray exposure age for the Y-82192 and Y-82193 with those for the lunar meteorites Allan Hills A-81005 and Y-791197 studied earlier shows that the lunar meteorites found on earth so far were ejected by at least two (and, possibly, three) impacts on the moon.
Eugster Otto
Niedermann Samuel
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