Computer Science
Scientific paper
Oct 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..20..101r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 20, Issue 2, pp.101-114
Computer Science
10
Scientific paper
Tektites from a number of localities have been examined for their contents of potassium, atmospheric argon, radiogenic argon, atmospheric neon, and possible cosmogenic neon. At 300°K, the coefficient of diffusion for helium in tektite glass from Kalgoorlie, Australia is 4 × 10 -10 cm 2 /sec. The activation energy for helium diffusion is 0.27 electron volts. The helium solubility constant is 0.005. Corresponding quantities for neon diffusion are 2 × 10 -15 cm 2 /sec, 0.61 electron volts and 0.005. The helium diffusion rate is so high that tektites retain no radiogenic or cosmogenic helium. The recent group of tektites, however, should retain a substantial amount of any cosmogenic neon contained at time of fall. In no case was any excess Ne 21 detected. From the upper limits of original Ne 21 content, a maximum "flight time" since last melting has been computed for each tektite. For a tektite from Kalgoorlie, this is 28,000 years. This result is in apparent disagreement with the finding by and of radioactive Al 26 in australites. Potassium-argon ages have been computed for each tektite. These range from 0 to 32 m.y. and are usually in agreement with the stratigraphie age of the formations on which the tektites lie, according to presently accepted time scales. Data in this paper do not support a recent suggestion that the moldavites of Czechoslovakia and the recently discovered tektites from Georgia U.S.A. are part of the same fall.
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