Age Determinations and Isotopic Abundance Measurements on Lunar Samples

Details Age Determinations and Isotopic Abundance Measurements on Lunar Samples Age Determinations and Isotopic Abundance Measurements on Lunar Samples

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..479w&link_type=abstract

Science, Volume 167, Issue 3918, pp. 479-480

Computer Science

2

Scientific paper

A K-Ar age of 2300 × 106 years has been determined for a sample of type A crystalline rock (57,34). The presence of an anomalously large quantity of 40Ar, in a sample of type C breccia (65,35) precluded the calculation of its K-Ar age. Both of the rock types are characterized by low Rb/Sr ratios and consequently low 87Sr/86Sr values. The U-Th-Pb results for a sample of type D fines (84,33) yield a 207Pb/206Pb age of 4760 × 106 years, but ages based on U-Pb and Th-Pb ratios are anomalously high. Isotopic compositions of Li, K, Rb, Sr, U, and Th are very close to the accepted values for terrestrial materials.

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