Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92....1e&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 92, no. 1, Feb. 1989, p. 1-6.
Physics
3
Chromium Isotopes, Meteoritic Composition, Murchison Meteorite, Anomalies, Magnesium Isotopes, Nuclear Fusion, Solar System, Spinel, Meteorites, Murchison, Chromium, Isotopes, Anomalies, Inclusions, Allende, Samples, Meteorite, Stony Meteorites, Carbonaceous Chondrites, Cv3 Chondrites, Patterns, Comparisons, Magnesium, Laboratory Studies, Microprobe Methods, Spinel, Distribution, Abundance, Manganese
Scientific paper
The abundances of chromium isotopes, in refractory inclusions from the Allende meteorite, show wide-spread anomalies. The chromium isotope anomalies are similar in pattern to the anomalies discovered in Ca and Ti. The largest effects occur at the neutron-rich isotopes Ca-48, Ti-50 and Cr-54. Individual Cr-rich pink spinels, from the Murchison meteorite, exhibit large and variable excesses in Cr-53 and Cr-54 including the largest Cr-53 anomaly so far reported. Magnesium isotopes, in Murchison Cr-poor blue spinels, also show variable anomalies in Mg-26 including mass-dependent fractionation favoring the lighter isotopes. The Cr-53, Cr-54 and Mg-26 anomalies in Murchison spinels are indicative of a heterogeneous distribution of magnesium and chromium isotopes in the early solar nebula and require a contribution from several nucleosynthetic components in addition to physicochemical processing.
Esat Tezer M.
Ireland Trevor R.
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