U-Pb systematics in iron meteorites - Uniformity of primordial lead

Details U-Pb systematics in iron meteorites - Uniformity of primordial lead U-Pb systematics in iron meteorites - Uniformity of primordial lead

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1681g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Aug. 1985, p. 1681-1695.

Computer Science

13

Iron Meteorites, Lead Isotopes, Meteoritic Composition, Etching, Solar Corona, Meteorites, Iron Meteorites, Uranium, Lead, Isotopes, Composition, Abundance, Samples, Meteorite, Canyon Diablo, Youndegin, Ia Irons, Deport, Mundrabilla, Odessa, Procedure, Contamination, Composition, Abundance, Radiogenic Elements

Scientific paper

Pb isotopic compositions and U-Pb abundances were determined in the metal phase of six iron meteorites: Canyon Diablo IA, Toluca IA, Odessa IA, Youndegin IA, Deport IA, and Mundrabilla An. Prior to complete dissolution, samples were subjected to a series of leachings and partial dissolutions. Isotopic compositions and abundances of the etched Pb indicate a contamination by terrestrial Pb which is attributable to previous cutting of the meteorite. Pb isotopic compositions measured in the decontaminated samples are identical within 0.2 percent and essentially confirm the primordial Pb value defined by Tatsumoto et al. (1973). These data invalidate more radiogenic Pb isotopic compositions published for iron meteorites, which are the result of terrestrial Pb contamination introduced mainly by analytical procedure. The results of this study support the idea of a solar nebula which was isotopically homogeneous for Pb 4.55 Ga ago. The new upper limit for U-abundance in iron meteorites, 0.001 ppb, is in agreement with its expected thermodynamic solubility in the metal phase.

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