Mathematics – Logic
Scientific paper
Jan 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38...65j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 1, pp.65-78
Mathematics
Logic
1
Scientific paper
He, Ne, Ar, Kr and Xe were measured mass spectrometrically in eight bulk fines and one sample of 2-4 mm fines (15603) from stations LM-ALSEP, 2, 6, 6 1 , 7 a , and 9. We have also measured these gases in size fractions of samples 15091 and 15601. These samples come from three morphologically distinct selenographic settings: the Appenine Front, the Mare and Hadley Rille. Measured gas contents in these samples are comparable to those from previous Apollo missions. He 4 and the other trapped gases are inversely proportional to grain diameter in the size fractions of 15091 and 15601. More than 90 per cent of the trapped gas in 15601 is surface correlated; hence is probably directly implanted solar wind. Size fractions of 15091 contain large volume correlated amounts of He 4 , Ne 20 and Ar 36 . He 4 /Ne 20 ranges from about 20 to 60; Ne 20 /Ar 36 from 5 to 8: Ar 36 /Kr 84 from 2400 to 3200; and Kr 84 /Xe 132 from 3·2 to 7·3. The lowest He 4 /Ne 20 ratios occur in samples rich in green glass spherules which have He 4 /Ne 20 10 ( , , and , unpublished). He 4 /He 3 ranges from about 210 to 2700; Ne 20 /Ne 22 from 12·7 to 13·2; Ne 21 /Ne 22 from 0·035 to 0·041; and Ar 36 /Ar 38 from 5·26 to 5·45. The measured Ar 40 /Ar 36 ratios range from 0·757 to 3·56; when corrected for radiogenic Ar 40 , the range becomes 0·6 to 3·4. The largest corrected Ar 40 /Ar 36 ratios occur in samples from the Apennine Front, the smallest occur in the Mare. This could be due to slope effects between the front as opposed to the mare terrain. An alternative possibility is that the Front fines acquired their atmospheric Ar 40 at a time when the concentration of neutral Ar 40 in the lunar atmosphere was relatively large. Ne 21 radiation ages were calculated for all samples. There is evidence in the landing area for debris from craters with ages less than 100 × 10 6 yr, but these craters cannot be firmly identified from the data.
Heymann Dieter
Jordan Jim L.
Lakatos S.
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