Other
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.303..339c&link_type=abstract
(Royal Society, Discussion on Planetary Exploration, London, England, Nov. 4, 5, 1980.) Royal Society (London), Philosophical Tr
Other
23
Aluminum Isotopes, Carbonaceous Chondrites, Gas Mixtures, Magnesium Isotopes, Meteoritic Composition, Oxygen Isotopes, Abundance, Data Acquisition, Mass Ratios, Silver Isotopes, Titanium Isotopes, Meteorites, Isotopes, Composition, Chondrites, Carbonaceous Chondrites, Ordinary Chondrites, Oxygen, Samples, Meteorite, Allende, Cv3 Chondrites, Magnesium, Silver, Titanium, Inclusions, Volatiles, Neon, Xenon, Gases, Nucleosynthesis, Timescale, Solar System, Formation, Anomalies
Scientific paper
Oxygen isotopic variations in carbonaceous chondrites and ordinary chondrites can each be interpreted as mixtures of two isotopically different reservoirs, one consisting of solids, enriched in O-16, the other of a gas, depleted in O-16 relative to terrestrial abundances. The data indicate a common source of the solids for each of the two classes of meteorites, but a different gas reservoir for each. These conditions might obtain in gaseous protoplanets. It is noted that radiogenic Mg-26 is variable in abundance among some classes of Allende inclusions, implying either nebular heterogeneity with respect to Al-26/Al-27 ratios or time differences of crystal formation. The presence of excess Ag-107 from decay of extinct Pd-107 corroborates the evidence from Mg-26 for a time interval of at most a few million years between the last nucleosynthetic event and the accretion of substantial bodies in the solar system.
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