Computer Science
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..797p&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, Feb. 1992, p. 797-815.
Computer Science
41
Chronology, Meteoritic Composition, Neodymium Isotopes, Planetary Evolution, Samarium Isotopes, Pyroxenes, Radioactive Decay, Rare Earth Elements, Trace Elements
Scientific paper
The feasibility of using Sm-147 and Sm-146 as chronometers was investigated using Sm-Nd data obtained on three meteorites: Ibitira, Morristown, and Acapulco. The results of isotope analyses demonstrate the presence of in situ decay of short-lived Sm-146 in these meteorites with initial abundances of Sm-146/Sm-144 between 0.009 and 0.007 in different meteorites. Precisely defined Sm-147/Nd-143 internal isochrons were obtained yielding ages equal to 4.46 +/-0.02 AE for Ibitira, 4.47 +/-0.02 AE for Morristown, and 4.60 +/-0.03 AE for Acapulco. However, detailed examination of the coupled Sm-147/Nd-143 and Sm-146/Nd-142 parent-daughter systematics and of initial Nd-143/Nd-144 values indicated the presence of inconsistencies in the data in spite of the precise isochrons, indicating the need for care in the interpretation of the parent-daughter systematics, even when they appear well behaved.
Papanastassiou Dimitri Anastassios
Prinzhofer Alain
Wasserburg Gerald J.
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