Computer Science
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67..137j&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 2, Feb. 1984, p. 137-150.
Computer Science
130
Achondrites, Chondrites, Meteoritic Composition, Neodymium Isotopes, Samarium Isotopes, Alpha Decay, Nuclear Fusion, Solar System, Meteorites, Chondrites, Achondrites, Evolution, Isotopes, Composition, Samarium, Neodymium, Systematics, Moama, Angra Dos Reis, Analysis, Isotopic Ratios, St. Severin, Ages, Samples, Meteorite, Comparisons, Rare Earth Elements, Hypotheses, Abundance, Solar System, Origin
Scientific paper
The chondrite data obtained as a result of an investigation of Sm-147-Nd-143 and Sm-146-Nd142 isotope systematics in five chondrites and the Moama and Andra dos Reis (ADOR) achondrites are consistent with previously reported reference values for the chondritic uniform reservoir (CHUR) of 0.511847 and 0.1967. The Nd-143/Nd-144 and Sm-147/Nd-144 values of the bulk chondrites analyzed suggest that the CHUR evolution is known to within 0.5 epsilon-units and 0.15 percent of the CHUR values for the entire history of the solar system. The Sm-146-Nd-142 systematics of ADOR and Moama support the hypothesis that Sm-146 was present in the early solar system, suggesting a high Sm-146/Sm-144 ratio that cannot be explained as a late injection forma supernova, and must instead be due to galactic nucleosynthesis.
Jacobsen Stein B.
Wasserburg Gerald J.
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