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Published August 1967 | public
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^(87)Rb-^(87)Sr ages of silicate inclusions in iron meteorites

Burnett, D. S. ORCID icon
Wasserburg, G. J. ORCID icon
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Abstract

Rb-Sr measurements were made on silicate inclusions extracted from the iron meteorites Toluca, Odessa, Four Corners, Linwood, Pine River, Colomera and Weekeroo Station. Strontium isotopic analyses were made on samples as small as 24 ng. The typical Sr and Rb blanks were 2 × 10^(−9) g and 2 × 10^(−10) g, respectively. In certain cases it was possible to obtain relatively precise isochrons. With the exception of Colomera, all of these samples gave ages compatible with 4.4 to 4.8 × 10^9 y. The Colomera data scatter widely and do not meet the requirements for defining a reliable age. None of the samples are compatible with an age of 6 × 10^9 y. The primary strontium observed or estimated for Toluca and Pine River agrees with that obtained from achondrites. It is evident that extensive Rb-Sr isotopic studies may be made on a large number of rather typical iron meteorites.

Additional Information

© 1967 Elsevier B.V. Received 19 June 1967. We wish to thank C. Frondel and U. Marvin of Harvard University, E. P. Henderson of the U.S. National Museum, V. Manson of the American Museum of Natural History and C. Moore of the Ninninger Meteorite Collection, for the meteorite samples used in this work. We thank Theodore Wen for invaluable assistance with the analytical work and L.P. Silver and P. Eberhardt for profitable discussions. This research was supported by grants from the National Science Foundation, NSF GA-464 and NSF GP-5391 and the U.S, Atomic Energy Commission AEC (AT-04-3(427)).

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August 22, 2023
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