Low Be-10 and Al-26 contents of ureilites - Production at meteoroid surfaces

Details Low Be-10 and Al-26 contents of ureilites - Production at meteoroid surfaces Low Be-10 and Al-26 contents of ureilites - Production at meteoroid surfaces

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1775a&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, June 1990, p. 1775-1784. Research supported by NSF.

Mathematics

Logic

6

Aluminum Isotopes, Beryllium Isotopes, Meteoritic Composition, Meteoroids, Ureilites, Asteroid Belts, Cosmic Rays, Solar Cosmic Rays, Meteorites, Meteoroids, Beryllium 10, Aluminum 26, Isotopes, Ureilites, Surface, Origin, Formation, Achondrites, Stony Meteorites, Procedure, Production Rate, Isotopic Ratios, Parent Bodies, Samples, Meteorite, Irradiation, Cosmic Rays, Comparisons, Nuclides, Laboratory Studies, Data, Catalog, Composition, Terrestrial Age, Weathering, Flux, Helium 3, Neon 21, Neon 22, Antarct

Scientific paper

The Be-10 contents of 22 ureilites and the Al-26 contents of 18 ureilites are reported. When corrected for exposure age, where known, and for composition, the results give production rate, P that are on average 20 percent lower than values typical of other meteorite classes. This depression of production rates, the weak correlations of both P26 and P10 with Ne-22/Ne-21 and the generally high He-3/Ne-21 and Ne-22/Ne-21 ratios in urelities all suggest that many of the samples occupied near-surface locations in their parent meteoroids. A reduced flux of cosmic rays does not by itself explain the elevated Ne-22/Ne-21 ratios and appears inconsistent with a proposed source for ureilites in the inner asteroid belt. Cosmogenic radionuclide data do not support the tentative pairing of ALHA 78019 with ALHa 78262 proposed on the basis of mineralogical similarities. The high Al-26 content of LEW 85440 may be the result of irradiation by solar cosmic rays.

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