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Apollo 16 - Impact melt sheets, contrasting nature of the Cayley plains and Descartes mountains, and geologic historyApollo 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.
Document ID
19840043301
Document Type
Reprint (Version printed in journal)
Authors
Mckinley, J. P. (New Mexico Univ. Albuquerque, NM, United States)
Taylor, G. J. (New Mexico Univ. Albuquerque, NM, United States)
Keil, K. (New Mexico, University Albuquerque, NM, United States)
Ma, M.-S. (New Mexico Univ. Albuquerque, NM, United States)
Schmitt, R. A. (Oregon State University Corvallis, OR, United States)
Date Acquired
August 12, 2013
Publication Date
February 15, 1984
Publication Information
Publication: Journal of Geophysical Research, Supplement
Volume: 89
ISSN: 0148-0227
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NGL-32-004-063
CONTRACT_GRANT: NAG9-63
CONTRACT_GRANT: NAG9-30
CONTRACT_GRANT: NGL-38-002-039
Distribution Limits
Public
Copyright
Other