On the isotopic composition of ruthenium in the Allende and Leoville carbonaceous chondrites

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Allende Meteorite, Carbonaceous Chondrites, Mass Spectrometers, Meteoritic Composition, Radiogenic Materials, Ruthenium Isotopes, Abundance, Quartz, Meteorites, Carbonaceous Chondrites, Isotopes, Composition, Ruthenium, Allende, Cv3 Chondrties, Stony Meteorites, Leoville, Composition, Samples, Meteorite, Laboratory Studies, Inclusions, Isotopic Ratios, Radiogenic Material, Comparisons, Procedure, Experiments, Abundance, Contamination, Mass Spectrometry, Samples, Terrestrial, Anomalies

Scientific paper

The isotopic composition of Ru in the Allende and Leoville chondrites was determined, measuring isotopic abundance ratios in an acid-resistant residue of the Allende meteorite and in one magnetic and three nonmagnetic portions of type-B inclusions, two from Allende and one from Leoville. Normalized to Ru-96/Ru-101, all Ru-98/Ru-101 and Ru-99/Ru-101 were found to be very similar to the terrestrial values. The Ru-100/Ru-101 and Ru-104/Ru-101 ratios deviated from the terrrestrial norm by more than 2 sigma in one and two cases, respectively. The Ru-102/Ru-101 ratio was normal in two aliquants of the acid-resistant Allende residue but was higher than normal in all four inclusion samples. Normalization to Ru-104/Ru-101, rather than to Ru-96/Ru-101, resulted in overabundances of the light p-process isotopes Ru-96 and Ru-98 in the nonmagnetic portions of all three inclusions.

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