Abstract
FOLLOWING a study of the data resulting from the lunar α-scattering experiment of Turkevich et al.1, Olsen2 pointed out that the rocks in the Mare Tranquillitatus region were similar in oxide composition to certain terrestrial anorthosites. When lunar rocks became available for examination after the Apollo 11 mission, O'Hara3 drew attention to the possibility that terrestrial anorthosites might be re-worked slices of the Earth's primordial crust. Windley4, in particular, supported this view proposing that early Pre-Cambrian Group III anorthosites are fragments of layered differentiates formed early in the evolution of the Earth. Romey5, on the other hand, does not like the comparison between lunar and terrestrial anorthosites and suggests that theories of lunar petrogenesis are developing too fast.
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