Noble gas isotopic composition, cosmic ray exposure history, and terrestrial age of the meteorite Allan Hills A81005 from the moon

Details Noble gas isotopic composition, cosmic ray exposure history, and terrestrial age of the meteorite Allan Hills A81005 from the moon Noble gas isotopic composition, cosmic ray exposure history, and terrestrial age of the meteorite Allan Hills A81005 from the moon

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..78..139e&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 78, no. 2-3, June 1986, p. 139-147. SNSF-supported research.

Computer Science

15

Cosmic Rays, Lunar Rocks, Meteoritic Composition, Radioactive Age Determination, Rare Gases, Abundance, Breccia, Exposure, Grain Size, Isotopes, Lunar Surface, Solar Wind

Scientific paper

A comprehensive study of the elemental and isotopic abundances of the noble gases He, Ne, Ar, Kr, and Xe in the meteorite Allan Hills A81005 from the moon is presented. In addition to a bulk sample, five grain-size fractions were analyzed. Chemical abundances relevant to the interpretation of the cosmic-ray-produced noble gases were determined and indicate that the grain size fractions are chemically uniform. Except for the fact that the trapped noble gas concentrations appear to be grain size correlated, the isotopic and elemental pattern of the trapped solar wind noble gases in A81005 are very similar to those observed in lunar soils and breccias. The A81005 material resided during (580 + or - 180) Myr in the nuclear active zone of the lunar regolith at an average shielding depth of about 40 g/sq cm. From literature data, it is concluded that the moon-earth transit time lasted less than a few million years. Finally, A81005 was captured by the earth more than 140,000 years ago, as indicated by the abundance of cosmic-ray-produced Kr-81.

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