Chondrite barium, neodymium, and samarium isotopic heterogeneity and early earth differentiation

被引：205

作者：

Carlson, Richard W.

Boyet, Maud

Horan, Mary

机构：

[1] Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, 5241 Broad Branch Road, NW

[2] UMR Magmas et Volcans CNRS 6524/IRD 163, Observatoire de Physique du Globe de Clermont-Ferrand, Université Jean Monnet, 42023 Saint Etienne

来源：

SCIENCE | 2007年 / 316卷 / 5828期

关键词：

D O I：

10.1126/science.1140189

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Isotopic variability in barium, neodymium, and samarium in carbonaceous chondrites reflects the distinct stellar nucleosynthetic contributions to the early solar system. We used Nd-148/Nd-144 to correct for the observed s-process deficiency, which produced a chondrite Sm-146-Nd-142 isochron consistent with previous estimates of the initial solar system abundance of Sm-146 and a Nd-142/Nd-144 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 Nd-142 in chondrites relative to terrestrial rocks reflects Sm-146 decay and early planetary differentiation processes.

引用

页码：1175 / 1178

页数：4

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