Abstract
Helium, neon, argon and xenon data are presented from a seven step heating of lunar rock 12013. Helium, neon and argon contain radiogenic and spallation components with no discernible trapped component. 3He and 21Ne cosmic ray exposure ages are 60 ± 12 m.y. The xenon contains a well defined spallation component, a fission component and possibly a trapped component but no evidence for decay products of extinct 129I or 244Pu. Apparent solidification ages are UThHe: 2.3 ± 0.5 by; K-Ar: 3.0 ± 0.7 by; 238U- 136Xe: 3.6 −1.4 +1.0 by (assuming solar wind type xenon as trapped xenon) or 2.2 −2.2 +1.6 by (assuming atmospheric trapped xenon).
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