Characterization of multiple lithologies within the lunar feldspathic regolith breccia meteorite Northeast Africa 001

摘要: Lunar meteorite Northeast Africa (NEA) 001 is a feldspathic regolith breccia. This study presents the results of electron microprobe and LA-ICP-MS analyses section NEA 001. We identify range lunar lithologies including impact melt, ferroan noritic anorthosite magnesian clasts, several very-low titanium (VLT) basalt clasts. The largest these clasts has rare earth element (REE) pattern with light-REE (LREE) depletion positive Euanomaly. clast also exhibits low incompatible trace (ITE) concentrations (e.g., <0.1 ppm Th, <0.5 Sm), indicating that it originated from parent melt did not assimilate KREEP material. Positive Eu-anomalies such low-ITE are uncharacteristic most basalts returned by Apollo Luna missions, basaltic samples. suggest features consistent VLT crystallizing which was derived early mantle cumulates formed prior to separation plagioclase in magma ocean, as previously been proposed for some other basalts. Feldspathic melts within sample found be more mafic than estimations composition upper crust, suggesting they may have melted incorporated material lower crust (possibly large basin-forming events). generally nature lack component, compositions leads us sourced Outer-Feldspathic Highlands Terrane (FHT-O), probably on farside about 1000 km sources both Low-Ti basalts, latter possibly existing cryptomaria deposits.