Computer Science
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..35..273l&link_type=abstract
Earth and Planetary Science Letters, vol. 35, no. 2, June 1977, p. 273-284. Research supported by the Research Corp.;
Computer Science
54
Abundance, Isotope Separation, Mass Ratios, Meteoritic Composition, Minerals, Data Reduction, Neodymium, Phosphates, Plutonium, Pyroxenes, Samarium
Scientific paper
Isotope ratios and age estimations are presented for the ultramafic pyroxenite Angra dos Reis meteorite. A pyroxene-phosphate internal isochron age of 4.55 plus or minus 0.04 eons was obtained, in agreement with reported Pb-Pb ages. It is suggested that Sm-146 decay led to an increase in the ratio of Nd-142 to Nd-144 in pyroxene, which is greater than the ratio of the Nd isotopes in phosphates. The effect of Pu-244 on the fission xenon components in pyroxene and phosphate is examined. The ratios of Pu-244 to Nd, U-238, and Th-232 are compared for pyroxene and phosphate separates. The exposure age of the meteorite, as obtained by the Kr-81 to Kr-83 method, was found to be 55.5 plus or minus 1.2 million years.
Lugmair Guenter W.
Marti Kurt
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