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Published Online October 5, 2006
Science DOI: 10.1126/science.1132595

Reports

Submitted on July 17, 2006
Accepted on September 15, 2006

Barium Isotopes in Chondritic Meteorites: Implications for Planetary Reservoir Models

Michael C. Ranen 1* and Stein B. Jacobsen 1

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

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

High precision barium isotope measurements yield differences of up to 25 ppm in 137Ba/136Ba and 60 ppm in 138Ba/136Ba between chondrites and Earth and likely arise from incomplete mixing of nucleosynthetic material in the solar nebula. Chondritic meteorites have a slight excess of supernova derived material compared to Earth helping to prove that the solar nebula was not perfectly homogenized upon formation.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)