Terrestrial, meteoritic, and lunar titanium isotopic ratios revaluated - Evidence for correlated variations

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Geochemistry, Lunar Composition, Meteoritic Composition, Titanium Isotopes, Abundance, Anomalies, Inclusions, Mass Spectroscopy, Titanium, Isotopes, Isotopic Ratios, Samples, Terrestrial, Comparisons, Lunar, Meteorite, Anomalies, Allende Meteorite, Data, Experiments, Inclusions, Chondrites, Leoville Meteorite, Ivuna Meteorite, Dhajala Meteorite, Chainpur Meteorite, Renazzo Meteorite, Murray Meteorite, Murchison Meteorite, Catalogs

Scientific paper

Variations in the titanium isotope ratios reported for various terrestrial and extraterrestrial materials are compared. Analysis of the Ti-46/Ti-49, Ti-48/Ti-49 and Ti-50/Ti-49 abundance ratios for terrestrial materials derived by three different laboratories indicates that bias between the techniques can be reduced to a level of about 10 parts per 10,000 for all ratios by means of a renormalization to an adopted value of the Ti-47/Ti-49 ratio. Renormalization of the results of high-precision mass spectrometry of 10 inclusions from the Allende meteorite indicates that nine inclusions are enhanced by about 10 parts per 10,000 in Ti-50/Ti-49, but are within a few epsilon units of terrestrial values in the other ratios. Other materials from Allende show no group isotopic pattern but display anomalous Ti-46 and Ti-50 abundances; Ti-46 and T-47 abundances; or Ti-50 and possibly Ti-46 and/or Ti-47 abundances. All but one of the samples may be interpreted as mixtures of a material similar to the FUN inclusion C-1 and varying amounts of a material enhanced in Ti-50 and Ti-46.

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