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- W1995184410 abstract "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 x 10(9) years. Dust and breccia yield apparent ages of 4.60 to 4.63 x 10(9) 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. discrepancy between the rock ages and dust ages poses a fundamental qusestion about rock genesis on the moon." @default.
- W1995184410 created "2016-06-24" @default.
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- W1995184410 date "1970-01-30" @default.
- W1995184410 modified "2023-09-27" @default.
- W1995184410 title "Uranium-Thorium-Lead Isotope Relations in Lunar Materials" @default.
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- W1995184410 doi "https://doi.org/10.1126/science.167.3918.468" @default.
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