Rubidium-strontium, uranium, and thorium-lead dating of lunar material

Gopalan, K. ; Kaushal, S. ; Lee-Hu, C. ; Wetherill, G. W. (1970) Rubidium-strontium, uranium, and thorium-lead dating of lunar material Science, 167 (3918). pp. 471-473. ISSN 0036-8075

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Rubidiuom and stronztiulm concentrations and strontium isotopic compositions have been measutred on whole rock samples and density fractions of microgabbro. Density fractionis on two rocks define isochrons of 3400 and 4500 million years with large uincertainties 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 thoriunm to lead in this sutrface material.

Item Type:Article
Source:Copyright of this article belongs to American Association for the Advancement of Science.
ID Code:13560
Deposited On:12 Nov 2010 15:20
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