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Rhenium-osmium isotope systematics in meteorites. I - Magmatic iron meteorite groups IIAB and IIIABResonance 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.
Document ID
19920048267
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Morgan, John W.
(NASA Headquarters Washington, DC United States)
Walker, Richard J.
(NASA Headquarters Washington, DC United States)
Grossman, Jeffery N.
(USGS Reston, VA, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1992
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 108
Issue: 4, Fe
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Accession Number
92A30891
Distribution Limits
Public
Copyright
Other

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