Computer Science
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..565m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Apr. 1982, p. 565-573.
Computer Science
4
Abundance, Lunar Composition, Meteoritic Composition, Niobium Isotopes, Planetary Evolution, Radioactive Age Determination, Zirconium Isotopes, Carbonaceous Chondrites, Chemical Analysis, Chemical Fractionation, Lunar Rocks, Mass Spectrometers, Mineralogy, Nuclear Reactions, Isotopes, Composition, Zirconium, Samples, Terrestrial, Niobium 92, Extraterrestrial, Dating Techniques, Analysis, Moon, Meteorites, Isotopic Ratios, Solar System, Formation, Techniques, Concentrations, Data, Mass Spectrometery, Chondri
Scientific paper
The isotopic composition of zirconium in lunar, meteoritic and old and recent terrestrial samples is analyzed. No isotopic variation is found, although the Zr-92/Zr-90 ratio of 3.8 Ga old zircons from the Isua acid conglomerate is on the lower limit of the range of the standard measurements. The maximum Nb-92/Nb-93 initial ratio at the time of formation of the solar system is 0.007, and thus the maximum sensitivity of the (Nb-92)-(Zr-92) relative radiochronometer for the formation of the planetary bodies is worse than ten million a. A survey of possible nuclear reactions indicates that zirconium isotopic variations in zircons are not easily produced, and that the Nb-92 and Nb-94 natural activities cannot be explained by any single one of the processes proposed thus far.
Allègre Claude J.
Minster Jean-François
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