NI isotopic compositions in Allende and other meteorites

Details NI isotopic compositions in Allende and other meteorites NI isotopic compositions in Allende and other meteorites

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63..177s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 63, no. 2, May 1983, p. 177-188.

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Abundance, Carbonaceous Chondrites, Extraterrestrial Matter, Meteoritic Composition, Nickel Isotopes, Chemical Composition, Cosmochemistry, Mass Spectroscopy, Solar System, Meteorites, Allende, Isotopes, Compositon, Nickel, Comparisons, Samples, Meteorite, Samples, Terrestrial, Techniques, Inclusions, Abundance, Patterns, Khohar, Matrix, Chondrules, Murray, Orgueil, Tieschitz, Anomalies, Nucleosynthesis

Scientific paper

A new technique for high-precision isotopic analyses of Ni is applied to terrestrial samples, Allende inclusions, and materials from other meteorites. It is noted that most of the Allende inclusions analyzed here were previously reported to contain isotopically anomalous Ti. In contrast, the Ni isotopic abundances are found to be indistinguishable from normal within presently obtainable precision, with only one possible exception. The latter inclusion has been shown by others to contain a significantly fractionated magnesium isotopic pattern of 9 parts per thousand/amu. A normal Ni isotopic pattern has also been observed for the chromite/carbon fraction of an Allende acid residue, which is known to have heavy noble gases of highly anomalous isotopic composition. All other meteoritic samples analyzed reveal normal isotopic compositions of Ni; no evidence for effects from now extinct Fe-60 could be detected. Despite ubiquitous isotopic anomalies in Ti from normal Allende inclusions there is no signature of isotopic variations in Ni from the same samples.

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