Re-187 - Os-187 systematics in meteorites and cosmochemical consequences

Details Re-187 - Os-187 systematics in meteorites and cosmochemical consequences Re-187 - Os-187 systematics in meteorites and cosmochemical consequences

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..130l&link_type=abstract

Nature, vol. 302, Mar. 10, 1983, p. 130-132.

Computer Science

95

Cosmochemistry, Meteoritic Composition, Osmium Isotopes, Rhenium Isotopes, Chondrites, Iron Meteorites, Mass Spectroscopy, Tables (Data), Meteorites, Cosmochemistry, Systematics, Isotopic Ratios, Isotopes, Techniques, Rhenium, Osmium, Composition, Ion Microprobe, Evolution, Mass Spectrometry, Dating Techniques, Analysis, Procedure, Chondrites, St. Severin Meteorite, Mesosiderites, Decay, Ages, Data, L Chondrites, Iron Meteorites, Catalog, Concentrations, H Chondrites, Ll Chondrites

Scientific paper

A new technique based on isotope dilution has allowed the reappraisal of Re-187 - Os-187 isotopic tracers. Rhenium and osmium were chemically separated and their isotopic compositions determined by ion-microprobe mass spectrometry. Such an approach led to the absolute dating of meteorites and allowed the estimation of the evolution of the Os isotopic composition in the earth's mantle. Having improved the analytical procedure and recalibrated the osmium spike, it is found that the value used previously was too high by a few per cent. Eight previous results on iron meteorites and on St Severin, corrected for this change in spike calibration, are therefore included here. Data now include 11 analyses on irons, and the iron phases of 10 chondrites and of one mesosiderite. From these data, a revised and more precise value for the rhenium decay constant is proposed, together with a new estimate for the age of the Galaxy.

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