Other
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15...16w&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Other
6
Lithology, Lunar Composition, Lunar Crust, Lunar Surface, Magma, Neutron Activation Analysis, Aluminum, Europium, Strontium, Moon, Element Ratios, Composition, Crust, Genesis, Samples, Lunar, Ferroan Materials, Magnesium, Anorthosite, Source, Formation, Magma, Plagioclase, Models, Silicate, Depletion, Comparisons, Volatiles
Scientific paper
Eu/Al, Sr/Al, Eu/Sr, and similar ratios among pristine lunar nonmare lithologies with implications for nonmare petrogenesis and for the bulk composition of the moon are examined. On a plot of Eu/Al versus mg, ferroan anorthosites are separated from all other pristine nonmare rocks by a considerable gap. A nonrandom process must be invoked to account for the gap in the spectrum of ratios. A single magma probably cannot account for even the Mg-rich pristine rocks subset, based on diversity of plagiophile ratios among samples with similar mg ratios. Plagiophile ratios also constrain the bulk composition of the moon. Plagiophile ratios among ferroan anorthosites exactly match those expected under a model in which ferroan anorthosites formed by flotation of plagioclase cumulates over a primordial 'magmasphere'. Ratios among nonvolatile elements confirm that the moon formed out of materials akin to chondritic meteorites.
Kallemeyn Gregory W.
Warren Harry P.
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