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Rb-Sr and Sm-Nd chronology of an Apollo 17 KREEP basaltThe paper determines Sm-Nd and Rb-Sr mineral isochrons for an Apollo 17 KREEP (pigeonite) basalt clast from breccia 72275 collected from Boulder 1, Station 2 in the Valley of Taurus-Littrow. Sm-Nd analyses of the basalt yield a precise mineral isochron age of 4.08 +/-0.07 Ga for lambda(Sm-147) = 0.00654/Ga. The concordancy of Sm-Nd and Rb-Sr ages for the basalt suggests that it crystallized about 4.08 Ga ago. Distinct ages and initial Sr isotopic ratios for Apollo 17 KREEP basalts and Apollo 14 and 15 KREEP suggest that these two types of KREEP basalts were not derived from the same source. Apollo 17 KREEP basalts are contemporaneous with some Apollo 14 aluminous mare basalts. The ages and Sr and Nd isotopic data suggest that these two different types of basalts were produced from sources having similar Rb/Sr ratios but different Sm/Nd ratios.
Document ID
19920048268
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/0012-821X(92)90023-O
Authors
Shih, C.-Y. (Lockheed Engineering and Sciences Co. Houston, TX, United States)
Nyquist, L. E. (NASA Johnson Space Center Houston, TX, United States)
Bansal, B. M. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Wiesmann, H. (Lockheed Engineering and Sciences Co. Houston, TX, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1992
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 108
Issue: 4 Fe
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
ISSN: 0012-821X
Accession Number
92A30892
Funding Number(s)
PROJECT: RTOP 152-14-40
Distribution Limits
Public
Copyright
Other

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