Abstract
Petrologic study of highland rock fragments handpicked from the Apollo 12 coarse fines confirms the KREEPy nature of the A‐12 highland components and the importance of norites and alkali anorthosites. This is in contrast to the calcic, non‐KREEPy A‐16 and A‐11 highland lithologies. The results add to the complexity of the igneous lunar highland rocks, which models for the formation of the lunar crust must take into account. A model involving moonwide differentiation followed by serial magmatism and heavy brecciation seems to be required. Results also show that non‐KREEPy highland materials are present at the A‐12 site and may represent Copernican and Imbrium ejecta, whereas the KREEPy materials may represent pre‐Imbrian terra, as at the A‐14 site.
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