Computer Science
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..635c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, June 1976, p. 635-643.
Computer Science
18
Carbonaceous Chondrites, Lead Isotopes, Meteoritic Composition, Radioactive Age Determination, Chondrule, Inclusions, Regression Analysis, Thorium Isotopes, Uranium Isotopes
Scientific paper
The objectives of the present study are to measure precise ages in bulk samples and separated components from the Allende chondrite, to determine which components are responsible for the lack of balance between uranium and radiogenic lead noted in earlier investigations, and to determine a time for the disturbance of the U-Pb system by evaluating the systematics of discordant ages in a concordia diagram. A regression line fitted to all the data in a Pb-207/Pb-204 - Pb-206/Pb-204 diagram is found to have a slope corresponding to a single-stage model age of about 4.565 billion years. The lead isotope systematics is shown to require that either the matrix is about 60 million years younger than the silicate inclusions and chondrules or the initial lead in the matrix differed from primordial lead. The concordia diagram indicates a relatively recent disturbance of the U-Pb system, perhaps 300 million years ago. It is concluded that the lead data cannot be reconciled with a model in which the bulk material first crystallized 4.57 billion years ago and transfer of radiogenic lead between phases followed since that time.
Chen Jacqueline H.
Tilton George R.
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