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Rare earths and other trace elements in Apollo 14 samples.REE and other trace elements have been determined in igneous rocks 14053, 14072, and 14310, in breccias 14063 and 14313, and in fines 14163. All materials analyzed have typical depletions of Eu except for feldspar fragments from the breccias and igneous fragments from 14063. Igneous rocks 14072 and 14053 have REE concentrations very similar to Apollo 12 basalts; 14310 has the highest REE concentrations yet observed for a large fragment of lunar basalt. The effects of crystallization of a basaltic liquid as a closed system on the concentrations of Sm and Eu in feldspar are considered. Small anorthositic fragments may have originated by simple crystallization from very highly differentiated basalt (KREEP) or by closed-system crystallization in a less differentiated starting material. Application of independent models of igneous differentiation to Sm and Eu in massive anorthosite 15415 and to Sm and Eu in lunar basalts suggests a common starting material with a ratio of concentrations of Sm and Eu about the same as that in chondrites and with concentrations of those elements about 15 times enriched over chondrites.
Document ID
19730034958
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Helmke, P. A.
Haskin, L. A.
Korotev, R. L.
Ziege, K. E.
(Wisconsin, University Madison, Wis., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Subject Category
Space Sciences
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: January 10, 1972
End Date: January 13, 1972
Accession Number
73A19760
Funding Number(s)
CONTRACT_GRANT: NGL-50-002-148
Distribution Limits
Public
Copyright
Other

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