Computer Science
Scientific paper
Jun 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..953s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 6, pp.953-969
Computer Science
4
Scientific paper
The rubidium, strontium, and strontium isotopic compositions have been determined in tektites from Indo-China, Philippine Islands, Java, Australia, Texas, Georgia, Massachusetts and Czechoslovakia. The range of Sr 87 / Sr 86 ratios in 18 tektites is from 0.7121 to 0.7223, indicating the results of et al . (1958), reporting no radiogenic strontium in tektites, were not of sufficient precision to study the problem definitively. This range of Sr 87 / Sr 86 ratios is quite small compared to the range found in nature, in general agreement with previous studies of oxygen and silicon isotopes in tektites. Rb and Sr contents of tektites from a given locality are very similar, but differences exist between localities. There is indicated, however, a sympathetic variation of the Sr 87 / Sr 86 and Rb / Sr ratios, i.e. the tektite groups have age values of approximately 400 m.y. If tektites were derived from the Moon, and the surface of the Moon is old (4.5 b.y.), the observed Sr 87 / Sr 86 ratios could not have been developed by achondritic, granitic, or tektitic surface material, but could have been generated by a basaltic type material. However, production of tektites from a basaltic type surface material during a high temperature fusion implies extreme fractionation in a direction contrary to expectation. A second possibility is that the Moon has undergone differentiation within the last 500 m.y.
Pinson H. Jr. W.
Schnetzler Charles C.
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