Computer Science
Scientific paper
Apr 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..875h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 37, Issue 4, pp.875-885
Computer Science
3
Scientific paper
The inert gases have been measured in six size fractions covering the range below 500 m, in a single feldspathic fragment weighing 523 g, and in an agglutinate particle weighing 465 g. The two size fractions between 125 and 250 m as well as 250 and 500 m were separated into magnetic and non-magnetic portions, which were measured separately. Like the Apollo and Luna 16 fines, the terra fines represented by Luna 20 are very rich in trapped solar-wind gases, but they contain relatively less He 4 and Ne 20 , which is revealed by their average He 4 / Ne 20 ratio of 35 and Ne 20 / Ar 36 ratio of 2.9. Obviously the terra materials are less retentive for solar-wind He and Ne than typical mare fines such as 10084. Whether this is due to the relatively small TiO 2 or the relatively large plagioclase content of the former is not resolved. ( Ar 36 / Kr 84 ) trapped and ( Ar 36 / Xe 132 ) trapped ratios are relatively large; the average values are 2800 and 14400, respectively. The apparent Ne 21 radiation ages of all the size fractions are in the range 209-286 × 10 6 yr; the average is 260 × 10 6 yr. This is in the range of values known for the Apollo and Luna 16 fines. The feldspathic fragment has a much greater apparent Ne c 21 age of 780 × 10 6 yr. The Ar 40 -Ar 36 systematic reveals the presence of two Ar 40 components, because Ar 40 = (1.41 ± 0.076) Ar 36 + (0.490 ± 0.130) × 10 -4 (cm 3 STP/g). The Ar 40 / Ar 36 slope of 1.41 is not inconsistent with an origin of the sample from a relatively old terra region.
Heymann Dieter
Lakatos S.
Walton James Richmond
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