Titanium isotopic anomalies in hibonites from the Murchison carbonaceous chondrite

Details Titanium isotopic anomalies in hibonites from the Murchison carbonaceous chondrite Titanium isotopic anomalies in hibonites from the Murchison carbonaceous chondrite

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1989i&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Sept. 1985, p. 1989-1993. Research supported by the Australian Nation

Computer Science

13

Carbonaceous Chondrites, Meteoritic Composition, Mineralogy, Murchison Meteorite, Titanium Isotopes, Abundance, Anomalies, Grains, Inclusions, Refractory Materials, Meteorites, Carbonaceous Chondrites, Titanium, Isotopes, Anomalies, Murchison, Samples, Meteorite, Composition, Hibonites, Ion Microprobe, Spectrometry, Abundance, Grains, Nucleogenesis, Formation, Source, Cm2 Chondrites, Stony Meteorites

Scientific paper

The isotopic compositions of titanium in eight grains of hibonite (CaAl12O19) from the carbonaceous chondrite Murchison have been determined by high precision secondary ion mass spectrometry using an ion microprobe. The titanium in the hibonites varies greatly in Ti-50 from about -42 to +8 permil (relative to terrestrial) with smaller (up to 4 permil), but clearly resolvable, effects in Ti-46 and Ti-48. These results confirm the presence of widespread negative anomalies suggested by the results of Hutcheon et al. (1983) on hibonites from Murchison. The magnitude of these variations seems explicable only in terms of nucleogenic processes which produced extremely variable titanium isotopic abundances in the hibonite source materials. The hibonites evidently did not participate to the same extent as most material in the mixing and homogenisation processes that accompanied the formation and later evolution of the solar system.

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