NASA NTRS · 19770051889
Thorium and uranium variations in Apollo 17 basalts, and K-U systematics
Abstract
It is found that Apollo 11 low-K and in particular Apollo 17 mare basalts show a wide range of Th/U ratios unlike other rocks; such variations cannot be explained by near surface crystal fractionation. A two-stage fractional crystallization-partial melting model involving a clinopyroxene cumulate as the major phase can explain the variations in Th/U ratios. Due to the Sm-Nd systematics constraint, several source cumulates are invoked to explain the observed Th/U continuum.
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Laul, J. C., Fruchter, J. S.. 1976-01-01. Thorium and uranium variations in Apollo 17 basalts, and K-U systematics. https://ntrs.nasa.gov/citations/19770051889
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