Ion Microprobe Investigation of Plagioclase and Orthopyroxene from Lunar Mg-Suite Norites: Implications for Calculating Parental Melt REE Concentrations and for Assessing Postcrystallization REE Redistribution

Details Ion Microprobe Investigation of Plagioclase and Orthopyroxene from Lunar Mg-Suite Norites: Implications for Calculating Parental Melt REE Concentrations and for Assessing Postcrystallization REE Redistribution Ion Microprobe Investigation of Plagioclase and Orthopyroxene from Lunar Mg-Suite Norites: Implications for Calculating Parental Melt REE Concentrations and for Assessing Postcrystallization REE Redistribution

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..995p&link_type=abstract

Lunar and Planetary Science, volume 27, page 995

Computer Science

Crust, Cumulates, Kreep, Moon, Trace Elements

Scientific paper

The lunar Mg suite, which includes dunites, troctolites, and norites, makes up to 20-30% of the Moon's crust down to a depth of ~60 km. The remainder is largely anorthosite. This report focuses on norites (which consist mostly of orthopyroxene and plagioclase) because we have found that both phases are effective recorders of their parental melt compositions. Our previous studies reported trace element data for orthopyroxene while this study reports trace element data for plagioclase. We estimated melt REE concentrations from both phases and found that, although there is some evidence of postcrystallization REE distribution, both phases still preserve an igneous signature. The estimated melt REE concentrations are similar to high-K KREEP especially for melts parental to A-15 norites. This study provides strong support for mineral trace element inversion estimates for parental melts. Even though these lunar crustal lithologies experienced high temperature annealing, the cores of plagioclase and pyroxene continue to carry a record of their igneous crystallization history.

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