ArticlesAbundance of Major Elements

Lunar Rock Compositions and Some Interpretations

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Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 527-528
DOI: 10.1126/science.167.3918.527

Abstract

Samples of igneous "gabbro," "basalt," and lunar regolith have compositions fundamentally different from all meteorites and terrestrial basalts. The lunar rocks are anhydrous and without ferric iron. Amounts of titanium as high as 7 weight percent suggest either extreme fractionation of lunar rocks or an unexpected solar abundance of titanium. The differences in compositions of the known, more "primitive" rocks in the planetary system indicate the complexities inherent in defining the solar abundances of elemizents and the initial compositions of the earth and moon.