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Ages of pristine noritic clasts from lunar breccias 15445 and 15455The Rb-Sr and Sm-Nd isotopic ages were determined for two Apollo 15 pristine lunar breccias, 15445 and 15455, collected near Spur Crater on the Apennine Front. The analyses of mineral separates from two norite samples in breccia 15445 showed that the Sm-Nd isotopic system for both norites from the large Clast B of 15445 was well defined, yielding precise ages of 4.28 +/- 0.03 Ga and 4.46 +/- 0.07 Ga, suggesting that the Cast B is a mixture of two or more lithologies. The overall age results indicate that some Mg-suite rocks are as old as ferroan-anorthosite-suite rocks. Moreover, age data of three major crustal rocks (a Mg suite, a ferroan-anorthosite suite, and an evolved suite) show that they all have variable ages.
Document ID
19930045398
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shih, C.-Y.
(Lockheed Engineering & Sciences Co. Houston, TX, United States)
Nyquist, L. E.
(NASA Johnson Space Center Houston, TX, United States)
Dasch, E. J.
(NASA Headquarters Washington, DC United States)
Bogard, D. D.
(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 & Sciences Co. Houston, TX, United States)
Date Acquired
August 16, 2013
Publication Date
February 1, 1993
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 57
Issue: 4
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
93A29395
Funding Number(s)
PROJECT: RTOP 152-14-40-21
Distribution Limits
Public
Copyright
Other

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