Computer Science
Scientific paper
Nov 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2417b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 37, Issue 11, pp.2417-2433
Computer Science
1
Scientific paper
Abundances and isotopic compositions of He, Ne, Ar, and Xe have been measured in eight recently fallen chondrites. Ratios of concentrations of cosmic ray-produced 3 He, 21 Ne, 22 Ne and 38 Ar indicate that all eight samples experienced less than average cosmic ray shielding. 3 He and 21 Ne exposure ages were calculated using shielding corrected chondritic production rates and the measured 22 Ne / 21 Ne . Exposure ages calculated from 22 Na / 22 Ne and 26 Al / 21 Ne ratios and constant relative production rates show a bias between the two ages due to variations in 22 Na / 26 Al . Arguments are presented that this bias is due to irradiation hardness differences, and therefore the use of constant values for both the 22 Na / 22 Ne and 26 Al / 21 Ne production ratios is not permitted. Dwaleni, Swaziland, was found to be an unusual gas-rich chondrite with high concentrations of solar-derived He and Ne and planetary-type Xe.
Bogard Donald D.
Reynolds Anthony M.
Simms L. A.
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