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U, Th, Pb and REE abundances and Pb 207/Pb 206 ages of individual minerals in returned lunar material by ion microprobe mass analysis.Results of ion microprobe analyses of Apollo 11, 12 and 14 material, showing that U, Th, Pb and REE are concentrated in accessory minerals such as apatite, whitlockite, zircon, baddeleyite, zirkelite, and tranquillityite. Th/U ratios are found to vary by over a factor of 40 in these minerals. K, Ba, Rb and Sr have been localized in a K rich, U and Th poor glass phase that is commonly associated with the U and Th bearing accessory minerals. Li is observed to be fairly evenly distributed between the various accessory phases. The phosphates have been found to have REE abundance patterns (normalized to the chondrite abundances) that are fairly flat, while the Zr bearing minerals have patterns that rise steeply, by factors of ten or more, from La to Gd. All the accessory minerals have large negative Eu anomalies. Radiometric age dates (Pb 207/Pb 206) of the individual U and Th bearing minerals compare favorably with the Pb 207/Pb 206 age of the bulk rocks.
Document ID
19720043448
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Andersen, C. A.
Hinthorne, J. R.
(Hasler Research Center Goleta, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
March 1, 1972
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 14
Subject Category
Space Sciences
Accession Number
72A27114
Funding Number(s)
CONTRACT_GRANT: NAS9-11566
Distribution Limits
Public
Copyright
Other

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