Abstract
The U distribution in rock 12013 was studied by fission track and elemental mapping techniques. Major U-bearing phases are whitlockite, apatite, zircon, and phase β, which is a Zr Ti mineral rich in Fe, Nb, Y, REE and containing up to 3.6% UO 2, 4.7% ThO 2, and 4.2% PbO. Calculated microprobe ages for phase β average 4.0 AE and are in reasonable agreement with Rb Sr and K Ar ages. Phase β plays a significant role in the U Th Pb systematics of rock 12013 and may play a similar role in the model ages of lunar soil.
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