Magnesian anorthosites from the western highlands of the Moon: Isotope geochemistry and petrogenesis

Details Magnesian anorthosites from the western highlands of the Moon: Isotope geochemistry and petrogenesis Magnesian anorthosites from the western highlands of the Moon: Isotope geochemistry and petrogenesis

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1327s&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1327-1328 (SEE N94-20636 05-91

Computer Science

Anorthosite, Breccia, Geochemistry, Lunar Geology, Magma, Minerals, Petrology, Radiogenic Materials, Samarium Isotopes, Kreep, Landing Sites, Lunar Crust, Lunar Mantle, Precipitates, Trace Elements

Scientific paper

Breccias from the Apollo 14 landing site have provided a wealth of information on the genesis of the lunar highlands. Various pristine rock-types have been discovered in relative abundance including rare ferroan anorthosites and alkali-suite and magnesian-suite rocks. Mineral-chemical and radiogenic isotopic data are reported here for a newly discovered Mg-suite anorthosite from Apollo 14, sample 14303,347. Meyer et al. reported U-Pb zircon analyses of Mg-suite highlands rocks from the western limb of the Moon. We have compiled these ages and generated a weighted average age of 4211 = 6 Ma; some 200 Ma younger than ferroan anorthosites. Utilizing this age for Mg-anorthosite 14303,347, our data results in an initial epsilonNd value of -1.0 and initial Sr-87/Sr-86 of 0.69915. Based on trace-element, isotopic, and mineral-chemical data, the western highlands Mg-suite is interpreted to be crustal precipitates of a picritic magma, which assimilated KREEPy trapped liquid from upper-mantle cumulates during its transport to the crust.

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