Rubidium-Strontium, Uranium, and Thorium-Lead Dating of Lunar Material

Details Rubidium-Strontium, Uranium, and Thorium-Lead Dating of Lunar Material Rubidium-Strontium, Uranium, and Thorium-Lead Dating of Lunar Material

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..471g&link_type=abstract

Science, Volume 167, Issue 3918, pp. 471-473

Computer Science

4

Scientific paper

Rubidium and strontium concentrations and strontium isotopic compositions have been measured on whole rock samples and density fractions of microgabbro. Density fractions on two rocks define isochrons of 3400 and 4500 million years with large uncertainties owing to low enrichment of radiogenic strontium. Lead from fine surface material is highly radiogenic. An age of 4750 million years has been calculated from the ratio of 207Pb/206Pb. The concentrations of uranium, thorium, and lead isotopes are consistent with the evolution of lead in a 4700-million-year-old closed system characterized by the ratios of uranium to lead and of thorium to lead in this surface material.

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