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Strontium-Rubidium Age of an Iron Meteorite

Wasserburg, G. J. and Burnett, D. S. and Frondel, C. (1965) Strontium-Rubidium Age of an Iron Meteorite. Science, 150 (3705). pp. 1814-1818. ISSN 0036-8075. doi:10.1126/science.150.3705.1814.

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The isotopic compositions and concentrations of rubidium and strontium were determined in silicate nodules contained in Weekeroo Station meteorite, a brecciated coarse octahedrite. The strontium had a Sr^(87):Sr^(86) range from 0.729 to 0.768, showing considerable enrichment in Sr^(87) in comparison with achondrites. Data for six samples of nodules lie on a straight line on the Sr-Rb evolution diagram, with an initial Sr^(87):Sr^(86) ratio of 0.696 to 0.702; the slope is 0.0674, corresponding to an age of 4.7 x 10^9 years for λ = 1.39 x 10^(-11) year^(-1). These data agree with the previously assigned ages for the formation of stony meteorites and the earth; they support the conclusion that the major period of chemical and physical differentiation in the solar system occurred in a narrow interval at about this time. This result disagrees with the Ar^(40)-K^(40) ages of 5 to 13 x 10^9 years determined from other iron meteorites. A wide variety of isotopic-age investigations now seem experimentally feasible on iron meteorites that contain silicates.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wasserburg, G. J.0000-0002-7957-8029
Burnett, D. S.0000-0001-9521-8675
Additional Information:© 1965 American Association for the Advancement of Science. Received 29 October 1965. We thank H. J. Lippolt for valuable discussion during the initial phases of this work, W. A. Fowler for provocative discussion and continuing interest, and Theodore Wen for careful analytical work. Supported by NSF and by contracts with the AEC [AT-04-3(427)] and ONR [Nonr-220(47)]. Contribution No. 1388 from California Institute of Technology.
Funding AgencyGrant Number
Atomic Energy CommissionAT-04-3(427)
Office of Naval Research (ONR)Nonr-220(47)
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Caltech Division of Geological Sciences1388
Issue or Number:3705
Record Number:CaltechAUTHORS:20151208-104231231
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Official Citation:Strontium-Rubidium Age of an Iron Meteorite G. J. Wasserburg, D. S. Burnett, and C. Frondel Science 31 December 1965: 150 (3705), 1814-1818. [DOI:10.1126/science.150.3705.1814]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62695
Deposited By: Tony Diaz
Deposited On:08 Dec 2015 22:40
Last Modified:10 Nov 2021 23:05

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