Abstract
The Luna 16 materials were dated by the Rb-Sr method. An internal isochron age of 3.4 ± 0.2 has been determined for a 6 mg fragment. The Luna 16 total soil is poorer in radiogenic Sr than any other analyzed soil from the Moon. Apollo 14 and 15 soils have also been studied; all of them fall nearly on a 4.65 b.y. isochron with the ADOR initial 87Sr 86Sr ratio. A comparison of the integrated Rb Sr of the basalt source region and the Rb Sr of the rocks suggests that these basaltic fragments have been generated with only minor Rb Sr fractionation. The existence of an old Rb-rich subcrust which contaminated the basalts is also in agreement with the present results.
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