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Science 25 May 2007:
Vol. 316. no. 5828, pp. 1175 - 1178
DOI: 10.1126/science.1140189
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Reports

Chondrite Barium, Neodymium, and Samarium Isotopic Heterogeneity and Early Earth Differentiation

Richard W. Carlson,* Maud Boyet,{dagger} Mary Horan

Isotopic variability in barium, neodymium, and samarium in carbonaceous chondrites reflects the distinct stellar nucleosynthetic contributions to the early solar system. We used 148Nd/144Nd to correct for the observed s-process deficiency, which produced a chondrite 146Sm-142Nd isochron consistent with previous estimates of the initial solar system abundance of 146Sm and a 142Nd/144Nd at average chondrite Sm/Nd ratio that is lower than that measured in terrestrial rocks by 21 ± 3 parts per million. This result strengthens the conclusion that the deficiency in 142Nd in chondrites relative to terrestrial rocks reflects 146Sm decayand earlyplanetary differentiation processes.

Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA.

{dagger} Present address: UMR Magmas et Volcans CNRS 6524/IRD 163, Observatoire de Physique du Globe de Clermont-Ferrand, 23 Rue Dr. Paul Michelon, Université Jean Monnet, 42023 Saint Etienne, France.

* To whom correspondence should be addressed. E-mail: carlson{at}dtm.ciw.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Coupled 142Nd-143Nd Isotopic Evidence for Hadean Mantle Dynamics.
V. C. Bennett, A. D. Brandon, and A. P. Nutman (2007)
Science 318, 1907-1910
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Science. ISSN 0036-8075 (print), 1095-9203 (online)