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Apollo 16 regolith breccias and soils - Recorders of exotic component addition to the Descartes region of the moonUsing the subdivision of Apollo 16 regolith breccias into ancient (about 4 Gyr) and younger samples (McKay et al., 1986), with the present-day soils as a third sample, a petrologic and chemical determination of regolith evolution and exotic component addition at the A-16 site was performed. The modal petrologies and mineral and chemical compositions of the regolith breccias in the region are presented. It is shown that the early regolith was composed of fragments of plutonic rocks, impact melt rocks, and minerals and impact glasses. It is found that KREEP lithologies and impact melts formed early in lunar history. The mare components, mainly orange high-TiO2 glass and green low-TiO2 glass, were added to the site after formation of the ancient breccias and prior to the formation of young breccias. The major change in the regolith since the formation of the young breccias is an increase in maturity represented by the formation of fused soil particles with prolonged exposure to micrometeorite impacts.
Document ID
19880065770
Document Type
Reprint (Version printed in journal)
Authors
Simon, S. B. (South Dakota School of Mines and Technology Rapid City, SD, United States)
Papike, J. J. (South Dakota School of Mines and Technology Rapid City, United States)
Laul, J. C. (Battelle Pacific Northwest Laboratories Richland, WA, United States)
Hughes, S. S. (South Dakota School of Mines and Technology Rapid City, SD, United States)
Schmitt, R. A. (Oregon State University Corvallis, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1988
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 89
Issue: 2 Ju
ISSN: 0012-821X
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAS9-15357
CONTRACT_GRANT: NAG9-63
CONTRACT_GRANT: NAG9-22
Distribution Limits
Public
Copyright
Other