Plutonium, uranium and rare earths in the phosphates of ordinary chondrites - The quest for a chronometer

Details Plutonium, uranium and rare earths in the phosphates of ordinary chondrites - The quest for a chronometer Plutonium, uranium and rare earths in the phosphates of ordinary chondrites - The quest for a chronometer

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..157c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 93, no. 2, June 1989, p. 157-169. Research supported by CNRS.

Computer Science

20

Calcium Phosphates, Chondrule, Plutonium 244, Radioactive Age Determination, Rare Earth Elements, Uranium Isotopes, Abundance, Chondrites, Meteoritic Composition, Single Crystals, Meteorites, Plutonium 244, Uranium, Rare Earth Elements, Fission Tracks, Phosphates, Ordinary Chondrites, Formation, Age, Mass Spectrometry, Concentration, Samples, Meteorite, Neodymium, Laboratory Studies, Apatite, Procedure, Merrillite, Catalog, Geochemistry, H Chondrites, L Chondrites, Ll Chondrites, Chronology, Fractionation

Scientific paper

The distributions of Pu, U, and the REEs in single crystals of the calcium phosphates, merrillite, and apatite of ordinary chondrites were investigated, inferring limites on Pu concentrations from fossil track measurements. The study takes spallation-induced tracks into account. Despite the higher affinity of both Pu and the REEs for merrilite than apatite, no quantitative correlation is found between the abundances of these elements in merrillite grains from a given ordinary chondrite, indicating that Pu-244 cannot be used to determine the relative formation times of chondrites.

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