Evidence for the formation of an iron meteorite at 3.8 × 10^9 years
- Creators
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Burnett, D. S.
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Wasserburg, G. J.
Abstract
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.
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)).Additional details
- Eprint ID
- 36860
- DOI
- 10.1016/0012-821X(67)90117-3
- Resolver ID
- CaltechAUTHORS:20130212-075050629
- NSF GA-464
- NSF
- NSF GP-5391
- NSF
- AT-04-3(427)
- U.S. Atomic Energy Commission AEC
- Created
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2013-02-25Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences
- Other Numbering System Name
- Caltech Division of Geological Sciences
- Other Numbering System Identifier
- 1461