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A pristine eucrite-like gabbro from Descartes and its exotic kindredA coarse-grained plagioclase-pyroxene gabbro (61224,6) with a cumulate texture suggestive of a slowly cooled plutonic rock was recovered from the 4-10 mm fraction of an Apollo 16 soil. The rock is uncommonly poor in feldspar and rich in Na for a lunar highlands lithology. Trace element analyses show extremely low siderophile element concentrations which confirm the pristine character indicated by the texture. The composition of 61224,6 is compared with those of 3 other pristine, exceptionally mafic, nonmare gabbros and of certain eucrites. 61224,6 and the three other gabbros have notable chemical differences but share relatively high ratios of Ti/Sm and Sc/Sm which suggest a possible genetic relationship. We conclude that 61224,6 represents a Na-rich cumulate from a layered intrusion within the highlands crust.
Document ID
19820038742
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Marvin, U. B.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Warren, P. H.
(New Mexico, University Albuquerque, NM, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Start Date: March 17, 1980
End Date: March 21, 1980
Accession Number
82A22277
Funding Number(s)
CONTRACT_GRANT: NGL-05-007-367
CONTRACT_GRANT: NGL-32-004-063
CONTRACT_GRANT: NSG-7596
Distribution Limits
Public
Copyright
Other

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