KREEP in the Western Lunar Highlands - an ion microprobe study of alkali and MG suite cumulates from the Apollo 12 and 14 sites

Details KREEP in the Western Lunar Highlands - an ion microprobe study of alkali and MG suite cumulates from the Apollo 12 and 14 sites KREEP in the Western Lunar Highlands - an ion microprobe study of alkali and MG suite cumulates from the Apollo 12 and 14 sites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1301s&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 301.

Mathematics

Logic

Lunar Rocks, Kreep, Apollo 12 Flight, Apollo 14 Flight, Alkali Metal Compounds, Magnesium, Highlands, Ion Probes, Petrology, Minerals

Scientific paper

Cumulate plutonic rocks of the Western Lunar Highlands Province are chemically and petrologically distinct from the more common ferroan anorthosites found elsewhere, reflecting their origin from magma series which postdate the lunar magma ocean. Deciphering the origin and evolution of plutonic rocks in the Western Lunar Highlands is difficult because of the small size of the highland rock clasts recovered from breccias, and because it is impossible to calculate parent magma compositions from whole rock chemical data on cumulate rocks. We report results from our continuing effort to characterize the parent magmas of alkali suite and Mg-rich suite lunar cumulates by using the ion microprobe and electron microprobe to analyze their cumulus phases. Parent magma compositions are calculated from the phase chemistry using equilibrium crystal/liquid partition coefficients. This approach eliminates the need for 'representative' bulk rock samples, and it allows us to evaluate the evolution of the trapped intercumulus melt during closed system crystallization.

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