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- W2036550529 abstract "The isotopic compositions of titanium in eight grains of hibonite (CaAI12O19) 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 50Ti, from about −42 to +8 permil (relative to terrestrial) with smaller (up to 4 permil), but clearly resolvable, effects in 46Ti and 48Ti. These results complement ion probe measurements by Faheyet al. (1985) of a 100 permil excess of 50Ti in a hibonite grain from the carbonaceous chondrite Murray, and confirm the presence of widespread negative anomalies suggested by the results of Hutcheonet 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. Thus, significant source materials of the hibonites may be the supernova condensates of Clayton (1978) and may support the concept of “chemical memory” (Clayton, 1978; Niemeyer and Lugmair, 1984)." @default.
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- W2036550529 date "1985-09-01" @default.
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- W2036550529 title "Titanium isotopic anomalies in hibonites from the Murchison carbonaceous chondrite" @default.
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- W2036550529 doi "https://doi.org/10.1016/0016-7037(85)90092-4" @default.
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