Age of a Lunar Anorthosite

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Science  28 Jan 1972:
Vol. 175, Issue 4020, pp. 428-430
DOI: 10.1126/science.175.4020.428


The crystallization age of an Apollo 15 anorthosite rock, 15415,9, returned from the lunar highlands has been measured to be (4.09 ± 0.19) x 109 years. The primitive lunar crust must have been formed in the first 300 to 400 x 106 years. The results give some credence to the hypothesis that the primitive lunar surface was molten and large-scale fractional crystallization occurred in the early history of the moon.