Abstract
Noble gas contents and shock effects have been studied in 21 Odessa irons from known geographic locations. Cosmogenic 3He, 21Ne, 38Ar contents and 3He/21Ne ratios vary by factors of 62, 91, 68, and 1.55, respectively, while 22Ne/21Ne ratios are virtually constant at 1.07. The samples fall into two groups differing by a factor of 4.1 in exposure age, 103 in source mass, or some combination of these. Three samples show significant shock effects, two of them to >130 kbar, probably arising during terrestrial impact from the crater-forming explosion. As in Canyon Diablo plains specimens, noble gas contents do not correlate with siting or shock.
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