Lovering and Kleeman reported in 1970 Lexan plastic print registration of induced Utrac fission tracks indicates most of the U in the lunar volcanic rocks (Type A, B) is localized in indeterminate interstitial areas of possible glassy material formed during the last stages of crystallization of the rocks. The highest concentrations (some >40 ppm U) seem to be associated with a particular reddish phase within these interstitial areas which may be baddeleyite. Extremely low abundances ( ≤0 005 ppm U) in the major phases (i.e., clinopyroxene, plagioclase and ilmenite) are characteristic of phases crystallizing from melts containing 1 ppm U.
U levels in the matrices of the breccias are generally 0.3 to 0.4 ppm U with local concentrations up to >50 ppm U. The interstitial areas of the Type A and B volcanic rocks have “moderate” Lexan print contrasts characteristic of ~1 to 5 ppm B or ~10 to 50 ppm, Li.
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