Mg isotope evidence for contemporaneous formation of chondrules and refractory inclusions

Nature
Martin BizzarroHenning Haack

Abstract

Primitive or undifferentiated meteorites (chondrites) date back to the origin of the Solar System, and thus preserve a record of the physical and chemical processes that occurred during the earliest evolution of the accretion disk surrounding the young Sun. The oldest Solar System materials present within these meteorites are millimetre- to centimetre-sized calcium-aluminium-rich inclusions (CAIs) and ferromagnesian silicate spherules (chondrules), which probably originated by thermal processing of pre-existing nebula solids. Chondrules are currently believed to have formed approximately 2-3 million years (Myr) after CAIs (refs 5-10)--a timescale inconsistent with the dynamical lifespan of small particles in the early Solar System. Here, we report the presence of excess (26)Mg resulting from in situ decay of the short-lived (26)Al nuclide in CAIs and chondrules from the Allende meteorite. Six CAIs define an isochron corresponding to an initial (26)Al/(27)Al ratio of (5.25 +/- 0.10) x 10(-5), and individual model ages with uncertainties as low as +/- 30,000 years, suggesting that these objects possibly formed over a period as short as 50,000 years. In contrast, the chondrules record a range of initial (26)Al/(27)Al ratios from (...Continue Reading

References

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Citations

Sep 17, 2004·Nature·Alex Halliday
Dec 24, 2004·Nature·Alan P Boss
Oct 9, 2013·Proceedings of the National Academy of Sciences of the United States of America·Gregory A BrenneckaMeenakshi Wadhwa
Jan 27, 2005·Proceedings of the National Academy of Sciences of the United States of America·Yangting LinDaode Wang
Jul 23, 2016·Geochimica Et Cosmochimica Acta·K K LarsenM Bizzarro
Jan 22, 2015·Proceedings of the National Academy of Sciences of the United States of America·Tu-Han LuuMarc Chaussidon
Feb 17, 2015·Geochimica Et Cosmochimica Acta·Martin SchillerMartin Bizzarro
Sep 20, 2019·Science Advances·M-C LiuA T Hertwig
Jun 15, 2005·Analytical Chemistry·Michael E LipschutzJohn M Hanchar

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