Uranium-Thorium-Lead Isotope Relations in Lunar Materials

Details Uranium-Thorium-Lead Isotope Relations in Lunar Materials Uranium-Thorium-Lead Isotope Relations in Lunar Materials

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..468s&link_type=abstract

Science, Volume 167, Issue 3918, pp. 468-471

Computer Science

4

Scientific paper

The lead isotopic compositions and uranium, thorium, and lead concentrations have been measured on six samples of material from the Sea of Tranquillity. The leads are moderately to very radiogenic; the initial lead concentrations are very low; the uranium and thorium levels are 0.26 to 0.88 and 0.87 to 3.35 parts per million, respectively. The Th/U ratios cluster about a 3.6 value. Apparent ages calculated for four rocks are 4.1 to 4.2 × 109 years. Dust and breccia yield apparent ages of 4.60 to 4.63 × 109 years. The uranium-lead ages are concordant, or nearly so, in all cases. The lunar surface is an ancient region with an extended record of events in the early history of the solar system. The discrepancy between the rock ages and dust ages poses a fundamental question about rock genesis on the moon.

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