Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..429v&link_type=abstract
Geophysical Research Letters, vol. 5, June 1978, p. 429-432.
Physics
Highlands, Lunar Rocks, Lunar Surface, Melting, Meteorite Collisions, Anorthosite, Apollo 16 Flight, Gabbro, Lunar Crust, Lunar Landing Sites, Mineralogy, Highlands, Moon, Samples, Lunar, Melts, Anorthosite, Classification, Anorthositic Gabbro, Gabbroic Anorthosite, Fra Mauro, Apollo 16, Partial Melting, Crust, Potassium, Magnesium, Silicon, Cluster Analysis Technique, Glasses
Scientific paper
Size can be used as a criterion to select 18 large (larger than 1 cm) samples from among 148 melt-rock fragments of all sizes. This selection provides a suite of large samples which represent the important chemical variants among highland melt rocks; each large sample has enough material for a number of sample-destructive studies, as well as for future reference. Cluster analysis of the total data base of 148 highland melt rocks shows six distinct groups: anorthosite, gabbroic anorthosite, anorthositic gabbro ('highland basalt'), low K Fra Mauro, intermediate-K Fra Mauro, and high-K. Large samples are available for four of the melt-rock groups (gabbroic anorthosite, anorthositic gabbro, low-K Fra Mauro, and intermediate-K Fra Mauro). This sample selection reveals two subgroups of anorthositic gabbro (one anorthite-poor with negative Eu anomaly and one anorthite-rich without Eu anomaly). There is a sharp distinction between those Apollo 16 melt rocks and glasses which have both been classified as 'gabbroic anorthosite'.
Papike James J.
Vaniman David T.
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