Physics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..215m&link_type=abstract
Geophysical Research Letters, vol. 6, Mar. 1979, p. 215-218.
Physics
5
Crystallography, Inclusions, Magnesium Isotopes, Meteoritic Composition, Anomalies, Fractionation, Ion Microscopes, Refractory Materials, Single Crystals, Chemical Composition, Magnesium, Isotopes, Isotopic Ratios, Aluminum, Murchison Meteorite, Samples, Meteorite, Ions, Mineralogy, Hibonite, Fractionation, Allende Meteorite, Refractory Elements, Electron Probes, Concentrations, Isotopic Anomalies
Scientific paper
Ion microprobe measurements show that some hibonite crystals from refractory-rich inclusions in Murchison contain isotopically anomalous Mg. The observed effects include: (1) the largest mass fractionation ever observed in nature for this element, about 10% per mass unit; (2) small Mg-26 excesses; (3) isotopic variability on a scale of microns or less in individual grains. These observations are corroborative evidence for the primitiveness of the Murchison inclusions. More importantly, they indicate that the types of Mg isotopic anomalies previously observed in Allende and Leoville inclusions are not confined to CV meteorites.
Macdougall Douglas J.
Phinney Douglas
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