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

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

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sci...316.1175c&link_type=abstract

Science, Volume 316, Issue 5828, pp. 1175- (2007).

Physics

60

Scientific paper

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 decay and early planetary differentiation processes.

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