Liquid immiscibility in a lunar plutonic setting and the evolution of KREEPY residual melts

Details Liquid immiscibility in a lunar plutonic setting and the evolution of KREEPY residual melts Liquid immiscibility in a lunar plutonic setting and the evolution of KREEPY residual melts

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..673j&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 673.

Computer Science

Solubility, Lunar Rocks, Granite, Melts (Crystal Growth), Ion Probes, Quartz

Scientific paper

Liquid immiscibility has been proposed as a process that might have produced lunar granite and separated felsic and mafic components of lunar residual melts (K-frac and REEP-frac). Textures reflecting liquid immiscibility have been observed in the late stage, iron-rich mesostasis of mare basalts, and immiscibility has been produced experimentally in Fe-rich KREEP-like compositions; however, only one lunar sample yet studied shows incontrovertible petrographic evidence for liquid immiscibility in a plutonic assemblage; this is a whitlockite-rich quartz monzogabbro. Important unanswered questions are how concentrated in incompatible elements lunar residual melts were at the time of immiscible liquid separation, and how effective such separated melts might have been as metasomatizing agents in the lunar crust. We present the results of ion-microprobe analyses of pyroxenes and feldspars in the lunar sample in question. The high bulk REE concentrations are the result of a high proportion of whitlockite, probably an excess (i.e., a whitlockite cumulate). We conclude that the REE distribution between minerals resulted from relatively low-T (900 C) equilibration of the final assemblage.

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