Other
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...243..519w&link_type=abstract
Science (ISSN 0036-8075), vol. 243, Jan. 27, 1989, p. 519-522.
Other
58
Carbonaceous Chondrites, Meteoritic Composition, Osmium Isotopes, Radioactive Age Determination, Rhenium Isotopes, Temporal Resolution, Cosmochemistry, High Temperature, Iron Meteorites, Mass Spectroscopy, Meteorites, Isotopic Ratios, Rhenium, Osmium, Systematics, Concentrations, Carbonaceous Chondrites, Stony Meteorites, Samples, Meteorite, Comparisons, Ll3 Chondrites, Ordinary Chondrites, Iron Meteorites, Spectrometry, Rnaa, Laboratory Studies, Murray, Semarkona, Cm2 Chondrites, Hypotheses, Catalog, Abund
Scientific paper
Rhenium and osmium concentrations and Os isotopic compositions of eight carbonaceous chondrites, one LL3 ordinary chondrite, and two iron meteorites were determined by resonance ionization mass spectrometry. Iron meteorite Re-187/Os-186 and Os-187/Os-186 ratios plot on the previously determined iron meteorite isochron, but most chondrite data plot 1 to 2 percent above this meteorite isochron. This suggests either that irons have significantly younger Re-Os closure ages than chondrites or that chondrites were formed from precursor materials with different chemical histories from the precursors of irons. Some samples of Semarkona (LL3) and Murray (C2M) meteorites plot 4 to 6 percent above the iron meteorite isochron, well above the field delineated by other chondrites. The isotopic composition of Semarkona could reflect assembly of isotopically heterogeneous components subsequent to 4.55 billion years ago or Os isotopic heterogeneities in the primordial solar nebular.
Morgan John W.
Walker Ray J.
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