Journal ArticleDOI
Evidence for the presence of 53Mn in the early solar system
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The first evidence for live 53Mn in the early solar system was given in this paper, showing that the initial 53Cr/52Cr in the Allende inclusions is lower than the terrestrial value.Abstract:
Chromium isotopic anomalies appear to be widespread in the Allende inclusions. Clear anomalies are shown in the 53Cr/52Cr isotopic ratio. Deviations from the terrestrial value are correlated with the Mn/Cr ratios indicating that 53Mn (half life T=3.7 × 106y) existed at the time of formation of the meteorite inclusions. The initial 53Cr/52Cr in the inclusions is lower than the terrestrial value.
Recent results have shown that chromium isotopic anomalies are frequent on the 54Cr isotope (Birck and Allegre, 1984). At the same time our results suggested the possibility of some anomalies on the 53Cr isotope which can be produced by the decay of 53Mn.
The present article presents improved precision measurements on the same inclusions of the Allende meteorite and an extension of the measurements to mineral separates. These results are the first evidence for live 53Mn in the early solar system (noted 53Mn* in the following).read more
Citations
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Early solar system timescales according to 53Mn-53Cr systematics
G. W. Lugmair,A. Shukolyukov +1 more
TL;DR: In this paper, a study of the 53Mn-53Cr systematics in various solar system objects: angrites, eucrites, chondrites, diogenites, pallasites, the Earth and the Moon, and SNC meteorites is presented.
Journal ArticleDOI
Widespread 54Cr Heterogeneity in the Inner Solar System
TL;DR: In this article, the authors report systematic deficits in 54Cr relative to Earth in differentiated molten planetesimals (the parent bodies of eucrites, diogenites, mesosiderites, pallasites, angrites, and Mars) and even in some chondritic material (ordinary chondrites).
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Stellar nucleosynthesis and the isotopic composition of presolar grains from primitive meteorites
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References
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Journal ArticleDOI
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The compositional classification of chondrites. vi: the cr carbonaceous chondrite group
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Journal ArticleDOI
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Journal ArticleDOI
Demonstration of 26 Mg excess in Allende and evidence for 26 Al
TL;DR: In this article, the authors reported the discovery of a large anomaly in the isotopic composition of Mg in a Ca-Al rich chondrule from the Allende meteorite.
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