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Evidence for the formation of an iron meteorite at 3.8 × 10^9 years

Burnett, D. S. and Wasserburg, G. J. (1967) Evidence for the formation of an iron meteorite at 3.8 × 10^9 years. Earth and Planetary Science Letters, 2 (3). pp. 137-147. ISSN 0012-821X.

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Rb Sr isotopic analyses were made on silicate inclusions from Kodaikanal, a brecciated fine octahedrite. Twelve analyses of different mineral fractions and separate inclusions were made. The silicates in this iron meteorite are highly enriched in alkalis and show ^(87)Sr/^(86)Sr ratios ranging up to 8.8. The samples lie on a well defined isochron on the Sr-Rb evolution diagram and indicate an age of 3.8 ± 0.1 × 10^9 y and an initial ^(87)Sr/^(86)Sr ratio between 0.69 and 0.73. These data provide unambiguous evidence for the ‘formation’ of younger solid objects in the solar system in a process which demands extensive chemical differentiation. This is evidence for an intermediate history for some meteoritic objects of a different sort than has been previously observed.

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Burnett, D. S.0000-0001-9521-8675
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1967 Published by Elsevier B.V. Received 1 May 1967. We gratefully acknowledge the cooperation of Dr. E. Olsen of the Chicago Natural History Museum and Drs. Orcel, Pellas, and Kraut of the Paris Mus6e d'Histoire Naturelle in obtaining meteorite samples. We were aided in the chemical and mass spectrometric analyses by Theodore Wen, and benefited from discussions with Drs. L. T. Silver and P. Eberhardt. This work 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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U.S. Atomic Energy Commission AECAT-04-3(427)
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Caltech Division of Geological Sciences1461
Issue or Number:3
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Official Citation:D.S. Burnett, G.J. Wasserburg, Evidence for the formation of an iron meteorite at 3.8 × 109 years, Earth and Planetary Science Letters, Volume 2, Issue 3, May 1967, Pages 137-147, ISSN 0012-821X, 10.1016/0012-821X(67)90117-3.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36860
Deposited By: Tony Diaz
Deposited On:25 Feb 2013 21:47
Last Modified:09 Mar 2020 13:19

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