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Spinel troctolite and anorthosite in Apollo 16 samples.Review of the examination results on two Apollo 16 rocks recovered from the lunar highlands which probably represent contrasting types of 'primitive' lunar cumulates. One is a microbreccia containing a large lithic fragment of spinel troctolite, while the other is a shock-brecciated anorthosite. The reviewed results suggest that, if the two rock groups formed from the same parent magma type, the spinel troctolite must have formed early in the differentiation sequence as the result of crystal settling in the melt, whereas the anorthosite must have formed as a later cumulate, possibly by flotation.
Document ID
19730031521
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Prinz, M.
Dowty, E.
Keil, K.
(New Mexico, University Albuquerque, N. Mex., United States)
Bunch, T. E.
(NASA Ames Research Center Space Sciences Div., Moffett Field, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 5, 1973
Publication Information
Publication: Science
Volume: 179
Subject Category
Space Sciences
Accession Number
73A16323
Funding Number(s)
CONTRACT_GRANT: NGL-32-004-063
Distribution Limits
Public
Copyright
Other

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