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Originally published in Science Express on 5 October 2006
Science 3 November 2006:
Vol. 314. no. 5800, pp. 809 - 812
DOI: 10.1126/science.1132595
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Reports

Barium Isotopes in Chondritic Meteorites: Implications for Planetary Reservoir Models

Michael C. Ranen* and Stein B. Jacobsen

High-precision barium isotope measurements yielded differences of up to 25 parts per million in the 137Ba/136Ba ratio and 60 parts per million in the 138Ba/136Ba ratio between chondrites and Earth. These differences probably arose from incomplete mixing of nucleosynthetic material in the solar nebula. Chondritic meteorites have a slight excess of supernova-derived material as compared to Earth, demonstrating that the solar nebula was not perfectly homogenized upon formation.

Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA.

* To whom correspondence should be addressed. E-mail: ranen{at}fas.harvard.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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R. W Carlson and M. Boyet (2008)
Phil Trans R Soc A 366, 4077-4103
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Isotopes as clues to the origin and earliest differentiation history of the Earth.
S. B Jacobsen, M. C Ranen, M. I Petaev, J. L Remo, R. J O'Connell, and D. D Sasselov (2008)
Phil Trans R Soc A 366, 4129-4162
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Chondrite Barium, Neodymium, and Samarium Isotopic Heterogeneity and Early Earth Differentiation.
R. W. Carlson, M. Boyet, and M. Horan (2007)
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