Other
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.300..414m&link_type=abstract
Nature, vol. 300, Dec. 2, 1982, p. 414-419.
Other
50
Chondrites, Evolution (Development), Radioactive Age Determination, Rubidium Isotopes, Solar System, Strontium 87, Abundance, Radioactive Decay
Scientific paper
Chondrites are chemically undifferentiated relative to the solar abundances, and have had a relatively simple history, leading to the suggestion that their age of formation corresponds to that of the solar system. An absolute value for this age can in principle be derived from such radioactive chronometers as the Rb-87-Sr-87 isochrons of H-, E-, and LL-chondrites, which are indistinguishable from each other. The joint isochron yields an age of 4498 plus or minus 15 million years, assuming an Rb-87 decay constant of 1.42 x 10 to the -11th/year, and an Rb-87/Sr-87 initial ratio of 0.69885 plus or minus 0.0001. For the age to agree with U-Th-Pb data, the Rb-87 decay constant would have to be changed to 1.402 plus or minus 0.008 x 10 to the -11th/year.
Allègre Claude J.
Birck Jean-Louis
Minster Jean-François
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