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Lunar ferroan anorthosite 60025 - Petrology and chemistry of mafic lithologiesEleven splits from the mafic-mineral-rich part of anorthosite 60025 were studied in order to establish the exact nature and causes of compositional variations in the minerals of lunar ferroan anorthosites. All splits were analyzed by INAA, and five were studied intensively by petrologic techniques. All splits were found to have similar cataclastic textures and show textural evidence of at least two episodes of deformation. The whole-rock split contains mafic minerals having a wide range of compositions and is probably polymict. It is suggested that the rare-earth patterns for all splits can be duplicated safactorily, assuming that the equilibrium liquids had flat, or nearly flat, chondrite-normalized rare-earth patterns. The plagioclases in all splits were found to be identical. Data obtained indicate that in ferroan anorthosites An content in plagioclase and mg' of associated mafic minerals are not strongly correlated.
Document ID
19910057714
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
James, O. B.
(Geological Survey Reston, VA, United States)
Mcgee, J. J.
(USGS Reston, VA, United States)
Lindstrom, M. M.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Country: United States
Start Date: March 12, 1990
End Date: March 16, 1990
Accession Number
91A42337
Funding Number(s)
CONTRACT_GRANT: NASA ORDER T-30400-C
CONTRACT_GRANT: NSG-9055
Distribution Limits
Public
Copyright
Other

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