The oldest zircons in the solar system

Details The oldest zircons in the solar system The oldest zircons in the solar system

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109....1i&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 109, no. 1-2, March 1992, p. 1-10.

Computer Science

33

Chondrites, Meteoritic Composition, Silicates, Solar System, Trace Elements, Zirconium, Lead Isotopes, Radioactive Age Determination, Rare Earth Elements, Thorium Isotopes, Uranium Isotopes

Scientific paper

The occurrence, chemistry, and U-Th-Pb isotopic systematics of three meteoritic zircon assemblages, two from the Vaca Muerta mesosiderite and one from the Simmern H5 chondrite, are presented. Like terrestrial zircons, the meteoritic zircons are enriched in the heavy rare-earth elements, but unlike terrestrial zircons, they do not show a positive Ce anomaly. This feature is also absent in one lunar zircon analyzed and probably reflects the oxidation state of the formation environment: under oxidizing conditions Ce(4+) is stabilized, whereas under relatively reducing conditions Ce(3+) is stable. The zircon from Simmern has depletions in the relative abundances of Tm and Yb, a characteristic of the volatility fractionation of the REE. The Simmern zircon has an exceptionally low U concentration (around 180 ppb), and only a poorly constrained Pb-207/Pb-206 age of 4100 +/- 700 Ma could be obtained.

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