Apollo 16 - Impact melt sheets, contrasting nature of the Cayley plains and Descartes mountains, and geologic history

Details Apollo 16 - Impact melt sheets, contrasting nature of the Cayley plains and Descartes mountains, and geologic history Apollo 16 - Impact melt sheets, contrasting nature of the Cayley plains and Descartes mountains, and geologic history

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..513m&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Mathematics

Logic

4

Apollo 16 Flight, Impact Melts, Lunar Landing Sites, Petrography, Abundance, Breccia, Electron Microscopy, Highlands, Lunar Evolution, Metal Oxides, Photomicrography, Plains, Moon, Apollo 16, Samples, Lunar, Impact Melts, Cayley Plains, Plains, Descartes Mountains, Geology, History, Station 4, Station 5, Mixing, Rake Samples, Electron Microprobe, Inaa, Neutron Activation Analysis, Comparisons, Lithology, Abundances, Soils, Composition, Petrography, Dimict Breccias, Feldspar, South Ray, Mineralogy, Analysis,

Scientific paper

Apollo 16 stations four and five rake samples have been examined petrographically and by electron microprobe and INAA. Lithologic abundances support the idea (Korontev, 1981) that the variation of soil composition at Apollo 16 results from mixing between a component represented by station five and components much like either the dimict breccias or feldspathic fragmental breccias in composition. Pyroxene, olivine, and coexisting plagioclase compositions from within the anorthosite portions of dimict breccias bridge the gap between the Mg-rich and ferroan anorthosite fields. Analyses from associated cumulate and granulitic clasts indicate that they are the source of the intermediate material. Dimict breccias formed about 3.92 b.y. ago, the nectaris event occurred 3.84-3.92 b.y. ago, and the Cayley plains were deposited as a result of the Imbrium event sometime later than 3.84 b.y.

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