The isotopic composition of silver and lead in two iron meteorites - Cape York and Grant

Details The isotopic composition of silver and lead in two iron meteorites - Cape York and Grant The isotopic composition of silver and lead in two iron meteorites - Cape York and Grant

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1725c&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, Oct. 1983, p. 1725-1737.

Computer Science

14

Iron Isotopes, Iron Meteorites, Lead Isotopes, Meteoritic Composition, Anomalies, Palladium, Solar System, Meteorites, Iron Meteorites, Isotopes, Composition, Silver, Lead, Cape York, Grant, Phases, Isotopic Ratios, Enrichment, Comparisons, Sulfides, Diffusion, Cooling Rate, Uranium, Metals, Concentrations, Procedure, Radiogenic Elements, Contamination, Samples, Meteorite, Parent Bodies, Metamorphism

Scientific paper

Anomalies in silver isotope composition in the metal phases of the Cape York (IIIA) and Grant (IIIB) iron meteorites are studied together with the lead isotopic composition of both the metal and sulfide phases of Cape York. Following extensive surface cleaning, the Ag-107/Ag-109 ratio in the metal phases of the meteorites is found to be in excess of the terrestrial ratio, and of that found in the sulfide phases. A definite correlation between the Ag-107/Ag-109 and Pd-108/Ag-109 ratios is observed for these meteorites, indicating the in situ decay of Pd-107 and supporting the widespread presence of Pd in the early universe. Lead, determined after cleaning and with chemical separations using low blank levels, is found to exist in variable proportions in the metal and sulfide phases. The sulfides appear to be dominated by radiogenic modern lead, which may be explained by terrestrial contamination or by late metamorphism in the meteorite parent body.

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