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Apollo 16 site geology and impact melts - Implications for the geologic history of the lunar highlandsThe geology of the Apollo 16 site is reconsidered on the basis of data from photogeology, geochemical remote sensing, and lunar samples. The site possesses an upper surface of anorthositic gabbro and related rocks. Mafic components were deposited as basin ejecta. The events involved in its geological evolution were the Nectaris impact and the Imbrium impact. The role of large, local craters in the history of the region was to serve as topographic depressions to accumulate basin ejecta. The most abundant melt composition at Apollo 16 is an aluminous variety of LKFM basalt supplied by the Nectaris impact as ejected basin impact melt. The mafic LKFM melt may have been supplied by the Imbrium impact. More aluminous melt groups are probably derived from local, small craters. The remainder of the deposits in the region are composed of anorthositic clastic debris derived from the Nectaris basin, the local crustal substrate, and Imbrium and other basins.
Document ID
19850035508
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Spudis, P. D.
(U.S. Geological Survey, Flagstaff; Arizona State University Tempe, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
November 15, 1984
Publication Information
Publication: Journal of Geophysical Research, Supplement
Volume: 89
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
85A17659
Distribution Limits
Public
Copyright
Other

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