Computer Science
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7921978m&link_type=abstract
Unknown
Computer Science
Abundance, Apollo 16 Flight, Lunar Craters, Lunar Rocks, Radioactive Age Determination, Anorthosite, Argon Isotopes, Chemical Composition, Lithology, Petrography, Trace Elements
Scientific paper
Breccia fragments were analyzed from the 2-4 mm sieve fraction of three Apollo 16 soils collected in the vicinity of North Ray Crater. The Ar39-Ar40 ages, Ar37-Ar38 exposure ages, abundances of major and certain trace elements, and petrographic data relevant to thermal history were obtained for up to 48 individual fragments. Among the samples, 30 gave Ar39-Ar40 release patterns that allowed the assignment of a high- or intermediate-temperature plateau age and the recognition of three age groups. The oldest fragments are all anorthositic metamorphosed breccias of light-matrix type. The younger fragments are noritic anorthosite and anorthositic norite breccias with textures indicative of greater annealing (melted matrix), one totally melted sample being of KREEP-basalt texture. The very young fragments are chiefly of glass or devitrified glass. The results are interpreted as reflecting two magnitudes of cratering.
Brown Michael G.
Eberhardt Peter
Geiss Johannes
Groegler N.
Kraehenbuehl Urs
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