U-Th-Pb in chondrites - Evidence of elemental mobilities and the singularity of primordial PB

Details U-Th-Pb in chondrites - Evidence of elemental mobilities and the singularity of primordial PB U-Th-Pb in chondrites - Evidence of elemental mobilities and the singularity of primordial PB

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63..147t&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 63, no. 2, May 1983, p. 147-166.

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11

Chondrites, Lead Isotopes, Meteoritic Composition, Thorium Isotopes, Uranium Isotopes, Carbonaceous Chondrites, Chemical Composition, Contamination, Extraterrestrial Matter, Meteorites, Chondrites, Uranium, Thorium, Lead, Elements, Systemics, Radiogenic Elements, Origin, Source, Contamination, Allende, Barwell, Comparions, Patterns, Matrix, Samples, Meteorite, Chondrules, Ages, Inclusions, Canyon Diablo

Scientific paper

A unified graphical approach that emphasizes the strict corellativity in the U-Th-Pb systematics and projects subtle diagnostic deviations from it is adopted in evaluating the existing data base. It is found that excess radiogenic Pb in chondrites is largely an artifact stemming from Pb contamination of some samples and apparent recent U loss from other samples. Taken at face value, the data are seen as indicating that recent U-Th mobility on the chondrule-scale is pervasive in Allende. In contrast, apparent recent U-Th mobility in Barwell is in general consistent with a gain of terrestrial Pb. Another finding is that Allende carries the isotopic imprints of recent multiple disturbances in which elemental mobilities were effected, but not isotopic homogenization of Pb. For Allende, the Pb isotope pattern of the matrix samples indicates terrestrial contamination. Canyon Diablo primitive Pb is seen as representing the primordial composition from which chondritic Pb evolved.

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