Computer Science
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..44...91m&link_type=abstract
Earth and Planetary Science Letters, vol. 44, no. 1, July 1979, p. 91-104.
Computer Science
10
Chemical Evolution, Geochronology, Lead Isotopes, Planetary Evolution, Earth Core, Earth Mantle, Graphs (Charts), Heterogeneity, Radioactive Age Determination, Time Functions, Transformations
Scientific paper
A way to look at PB-PB isotopic results is proposed. The characteristics are as follows: (1) knowledge of the initial ratios of cogenetic samples is not necessary to discuss the isotopic evolution of parent bodies; and (2) linear representations are permissible, thus allowing for a simplified treatment in comparison with the classical Pb-206/Pb-204 vs. Pb-207/PB-204 diagram. By using Pb-Pb data of terrestrial samples, either stated in past research or as recently measured in the laboratory, problems such as the earth's age and its evolution are being dealt with by utilizing this formalism. The treatment for a set of mantle whole-rock measurements, with only the initial isotopic composition assumed, furnishes a value for the earth's age of 4.49 plus or minus 0.17 b.y.
Allègre Claude J.
Dupré Bernard
Hamelin Bernard
Manhes Gerard
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