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Geochemistry of lunar crustal rocks from breccia 67016 and the composition of the moonThe geochemistry of anorthositic clasts from an Apollo 16 breccia 67016 is studied in order to investigate the role of these rock types in lunar crustal evolution. The samples have aluminous, alkali-poor compositions and varied FeO and MgO contents. Three compositional groups are recognized. One group is poor in mafic constituents with low abundances of lithophile trace elements typical of lunar anorthosites, while the other two groups are more mafic and are distinguished from each other by FeO/MgO ratios greater than one in the case of ferroan noritic and less than one in the case of magnesian troctolitic. These mafic-enriched varieties have considerably higher lithophile element concentrations, at levels similar to that of the bulk lunar crust. The ferroan noritic clasts may represent a fundamental type of igneous rock in the lunar crust which has not been widely recognized.
Document ID
19920053688
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Norman, Marc D.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Taylor, Stuart R.
(Australian National University Canberra, Australia)
Date Acquired
August 15, 2013
Publication Date
March 1, 1992
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 56
Issue: 3 Ma
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
92A36312
Funding Number(s)
CONTRACT_GRANT: NAG9-454
Distribution Limits
Public
Copyright
Other

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