Other
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47...43k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Jan. 1983, p. 43-58.
Other
17
Abundance, Iron Meteorites, Meteoritic Composition, Silver Isotopes, Anomalies, Cooling, Palladium, Troilite, Meteorites, Isotopes, Composition, Conclusion, Silver, Iron, Origin, Troilite, Analysis, Metals, Enrichment, Anomalies, Decay, Source, Palladium, Isotopic Ratios, Cooling Rate, Temperature, Models, History, Comparisons, Bombardment, Iron Meteorites, Thermal History, Experiments, Samples, Meteorite, Procedure, Techniques, Canyon Diablo Meteorite, Hoba Meteorite, Santa Clara Meteorite, Deep Springs Me
Scientific paper
The isotopic composition of Ag and the concentration of Ag and Pd have been determined in Canyon Diablo (IA), Grant (IIIB), Hoba, Santa Clara, Tlacotepec and Warburton Range (IVB), Piñon and Deep Springs (anom.). Troilite from Grant and Santa Clara have also been analyzed. All of these meteorites, with the exception of Canyon Diablo, give 107Ag/109Ag in the metal phase that is greater than the terrestrial value with the enrichments of 107Ag ranging from ≡2% to 212%. These data show that Ag of anomalous isotopic composition is common to all IVB and anomalous meteorites. The results on Grant suggest that the anomalies may be widespread including more common meteorite groups. There is a general correlation of 107Ag/109Ag with Pd/Ag except for the data from FeS of Santa Clara. The data suggest that Ag in Santa Clara and possibly other IVB meteorites is made up of almost pure 107Ag produced from 107Pd decay and 109Ag produced by nuclear reactions with only a small amount of "normal" Ag. This indicates an intense energetic particle bombardment history in the early solar system (≡1020 p/m2) which occurred after the formation of small planetary bodies. The authors infer that a T-Tauri activity by the early sun contributed to some late stage "nucleosynthesis" and the heating of a dust cloud. In addition, implications on the early thermal evolution of iron meteorites are presented based on 107Pd decay and models of the cooling history.
Kaiser Tomas
Wasserburg Gerald J.
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