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Title: Apollo 16 site geology and impact melts - Implications for the geologic history of the lunar highlands

The 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.
Authors:
Publication Date:
OSTI Identifier:
5822594
Report Number(s):
CONF-840385-
Journal ID: CODEN: JJGAD
Resource Type:
Conference
Resource Relation:
Journal Name: JGR, J. Geophys. Res., (Sect.) C:; (United States); Journal Volume: 89; Conference: 15. lunar and planetary science conference, Houston, TX, USA, 12 Mar 1984
Research Org:
Geological Survey, Flagstaff, AZ
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MOON; GEOLOGY; ABUNDANCE; APOLLO PROJECT; GEOCHEMISTRY; LUNAR MATERIALS; VOLCANOES; CHEMISTRY; MATERIALS; SATELLITES 640107* -- Astrophysics & Cosmology-- Planetary Phenomena