O-16 excesses in Murchison and Murray hibonites - A case against a late supernova injection origin of isotopic anomalies in O, Mg, Ca, and TI

Details O-16 excesses in Murchison and Murray hibonites - A case against a late supernova injection origin of isotopic anomalies in O, Mg, Ca, and TI O-16 excesses in Murchison and Murray hibonites - A case against a late supernova injection origin of isotopic anomalies in O, Mg, Ca, and TI

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323l..91f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. L91-L95.

Astronomy and Astrophysics

Astrophysics

31

Abundance, Gravity Anomalies, Mass Spectroscopy, Meteoritic Composition, Supernovae, Calcium Isotopes, Magnesium Isotopes, Nuclear Reactions, Oxygen Isotopes, Rare Earth Elements, Solar System

Scientific paper

The oxygen isotopic compositions of seven individual hibonite samples from the carbonaceous chondrites Murchison and Murray have been measured by means of ion microprobe mass spectrometry. All seven samples show large 16O excesses relative to terrestrial oxygen. These hibonites have the largest 48Ca and 50Ti isotopic anomalies found to date; thus there is no intrinsic relationship between anomalies of a nucleosynthetic origin and isotopic mass fractionation effects. There is no correlation between the oxygen isotopic compositions, the initial 26Al/27Al ratios, the Ca and Ti isotopic abundances, or the rare earth element patterns of individual hibonite grains. In particular, the large 16O excess seen in the Murchison grain BB-5 argues against a late injection of exotic material from a nearby supernova as a source for the isotopic anomalies.

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