Rocks 60618 and 65785 - Evidence for admixture of KREEP in lunar impact melts

Details Rocks 60618 and 65785 - Evidence for admixture of KREEP in lunar impact melts Rocks 60618 and 65785 - Evidence for admixture of KREEP in lunar impact melts

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975georl...2..369k&link_type=abstract

Geophysical Research Letters, vol. 2, Sept. 1975, p. 369-372.

Physics

Basalt, Chemical Composition, Impact Damage, Lunar Rocks, Abundance, Admixtures, Anorthosite, Apollo 16 Flight, Phosphorus, Potassium, Rare Earth Elements, Spinel

Scientific paper

We present evidence to support the hypothesis that the fine-grained, basaltic-textured portions of rocks 60618 and 65785 were produced by impact melting of the coarse-grained spinel-olivine anorthosite (60618) and spinel troctolite (65785) portions, coupled with admixture of approximately 33% and 63%, respectively, material of alkalic high-alumina basalt (KREEP) composition. The abundance of impact-modified rocks at the Apollo 16 site with compositional similarities to the impact melts reported here, suggests that the relations observed in these rocks are indicative of widespread impact mixing with KREEP in rocks of the lunar highlands.

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