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

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

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sci...325..985v&link_type=abstract

Science, Volume 325, Issue 5943, pp. 985- (2009).

Physics

53

Scientific paper

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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