Abstract
The isotopic composition of molybdenum in eight iron meteorites and one stone meteorite, as well as the isotopic composition of zirconium in one stone and one iron meteorite, are reported. Molybdenum and zirconium in some meteorites are similar in their isotopic abundances to terrestrial samples. The anomalies previously reported in the other meteorites are considered doubtful because of some observed mass fractionation during analysis, and because of the fact that the anomalous Mo in Aroos meteorite was not found in another sample of Aroos taken about 6 cm from the first sample. The elemental abundance of molybdenum in seven iron meteorites was determined by isotope dilution method. The concentration of molybdenum is found to range from 6.2 to 7.4 ppm in all types of iron meteorites investigated.
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