Homogeneous Distribution of <SUP>26</SUP>Al in the Solar System from the Mg Isotopic Composition of Chondrules - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Science Année : 2009

Homogeneous Distribution of 26Al in the Solar System from the Mg Isotopic Composition of Chondrules

Résumé

The timing of the formation of the first solids in the solar system remains poorly constrained. Micrometer-scale, high-precision magnesium (Mg) isotopic analyses demonstrate that Earth, refractory inclusions, and chondrules from primitive meteorites formed from a reservoir in which short-lived aluminum-26 (26Al) and Mg isotopes were homogeneously distributed at ±10%. This level of homogeneity validates the use of 26Al as a precise chronometer for early solar system events. High-precision chondrule 26Al isochrons show that several distinct chondrule melting events took place from ~1.2 million years (My) to ~4 My after the first solids condensed from the solar nebula, with peaks between ~1.5 and ~3 My, and that chondrule precursors formed as early as 0.87-0.16+0.19 My after.

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Dates et versions

insu-03619248 , version 1 (25-03-2022)

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Johan Villeneuve, Marc Chaussidon, Guy Libourel. Homogeneous Distribution of 26Al in the Solar System from the Mg Isotopic Composition of Chondrules. Science, 2009, 325, pp.985. ⟨10.1126/science.1173907⟩. ⟨insu-03619248⟩
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