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Breccia 66055 and related clastic materials from the Descartes region, Apollo 16Trace and major element contents obtained by instrumental neutron activation are reported for a number of Apollo 16 soil samples and miscellaneous breccia fragments. In addition, data obtained by instrumental neutron activation and electron microprobe techniques along with petrographic descriptions are presented for selected subsamples of breccia 66055. The compositions of our soil samples can be modeled by mixtures of various amounts of anorthosite, anorthositic gabbro and low-K Fra Mauro basalt components. These mixtures are typical of those found in a number of petrographic surveys of the fines. Breccia 66055 is a complex regolith breccia which consists of at least four distinct types of microbreccias. No systematic relation with respect to stratigraphic age among the various microbreccia types was observed. Compositionally and texturally, the clasts which compose breccia 66055 are similar to a number of previously reported rock types from the Apollo 16 area. The entire breccia appears to have undergone a complex history of thermal metamorphism. We conclude from the study of these samples that the Cayley Formation is probably homogeneous in its gross compositional and petrographic aspects.
Document ID
19750055536
Document Type
Conference Proceedings
Authors
Fruchter, J. S.
Kridelbaugh, S. J.
Robyn, M. A.
Goles, G. G. (Oregon, University Eugene, Ore., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1974
Subject Category
LUNAR AND PLANETARY EXPLORATION
Meeting Information
Lunar Science Conference(Houston, TX)
Funding Number(s)
CONTRACT_GRANT: NGL-38-003-024
CONTRACT_GRANT: NGL-38-003-022
Distribution Limits
Public
Copyright
Other