Computer Science
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..195d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Feb. 1977, p. 195-205.
Computer Science
3
Argon Isotopes, Breccia, Mass Ratios, Pressure Effects, Radioactive Age Determination, Shock Wave Interaction, Calcium, Gas Evolution, Hysteresis, Lunar Composition, Outgassing, Potassium Isotopes, Radiometers, Temperature Effects
Scientific paper
An investigation is conducted concerning a reversal effect that has been observed in the case of the curve involving the ratio of the quantity of Ar-40 which is derived from the decay of K-40 and the quantity of Ar-39 which is produced in the n,p reaction on K-39. According to this effect, called the drop-off effect, the ratio is lower at high temperatures. The possibility that shock produces the drop-off effect is studied, taking into account laboratory shock experiments and an examination of terrestrial crater samples. The experiments reported tend to weaken the hypothesis that the drop-off in the Ar-40/Ar-39 ratio observed in lunar breccias results from shock, but they do not disprove such a possibility.
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