Terrestrial Ratio of Potassium to Rubidium and the Composition of Earth's Mantle

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Science  19 Feb 1965:
Vol. 147, Issue 3660, pp. 858-860
DOI: 10.1126/science.147.3660.858


The ratios of potassium to rubidium determined for a series of oceanic volcanic rocks suggest that the K/Rb ratio of the upper mantle exceeds 1500. The similarity between this inferred K/Rb ratio for the mantle and that found in some achondritic meteorites suggests a similar overall composition for these materials.