ArticlesTrace Elements

Abundance of Alkali Metals, Alkaline and Rare Earths, and Strontium-87/ Strontium-86 Ratios in Lunar Samples

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Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 485-487
DOI: 10.1126/science.167.3918.485


The variation in trace element abundance patterns indicates that lunar igneous rocks are the product of extensive igneous fractionation. Variations in the Sr87/ Sr86 ratio indicate that these rocks crystallized 3.5±0.3 x 109 years ago.

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