Computer Science
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.108..191m&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 108, no. 4, Feb. 1992, p. 191-202. Research supported by NASA.
Computer Science
13
Cosmochemistry, Iron Meteorites, Meteoritic Composition, Osmium Isotopes, Rhenium Isotopes, Crystallization, Geochronology, Mass Spectroscopy, Radioactive Age Determination
Scientific paper
Resonance ionization mass spectrometry is used to determine the Re and Os abundances by isotope dilution (ID) and to measure Os-187/Os-186 ratios from 19 iron meteorites. Abundances range from 1.4 to 4800 ppb Re, and from 13 to 65,000 ppb Os, and generally agree well with previous ID and neutron activation results. The Re and Os data suggest that abundance trends in these iron groups may be entirely explained by fractional crystallization. Whole-rock isochrons for the IIAB and IIIAB groups are statistically indistinguishable. Pooled data yield an initial Os-187/Os-186 of 0.794 +/- 0.010 Ga. Given the errors in the slope and half life, this age does not differ significantly from the canonical chondrite age of 4.56 Ga, but could be as young as 4.46 Ga.
Grossman Jeffery N.
Morgan John W.
Walker Richard J.
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