Chronology of the early Solar System from chondrule-bearing calcium-aluminium-rich inclusions

Alexander N. Krot (), Hisayoshi Yurimoto, Ian D. Hutcheon and Glenn J. MacPherson
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Alexander N. Krot: University of Hawai'i at Manoa
Hisayoshi Yurimoto: Tokyo Institute of Technology
Ian D. Hutcheon: Lawrence Livermore National Laboratory
Glenn J. MacPherson: Smithsonian Institution, Department of Mineral Sciences, NHB 119

Nature, 2005, vol. 434, issue 7036, 998-1001

Abstract: Abstract Chondrules and Ca-Al-rich inclusions (CAIs) are high-temperature components of meteorites that formed during transient heating events in the early Solar System. A major unresolved issue is the relative timing of CAI and chondrule formation1,2,3,4. From the presence of chondrule fragments in an igneous CAI, it was concluded that some chondrules formed before CAIs (ref. 5). This conclusion is contrary to the presence of relict CAIs inside chondrules6,7,8,9,10, as well as to the higher abundance of 26Al in CAIs11; both observations indicate that CAIs pre-date chondrules by 1–3 million years (Myr). Here we report that relict chondrule material in the Allende meteorite, composed of olivine and low-calcium pyroxene, occurs in the outer portions of two CAIs and is 16O-poor (Δ17O ≈ - 1‰ to -5‰). Spinel and diopside in the CAI cores are 16O-rich (Δ17O up to -20‰), whereas diopside in their outer zones, as well as melilite and anorthite, are 16O-depleted (Δ17O = -8‰ to 2‰). Both chondrule-bearing CAIs are 26Al-poor with initial 26Al/27Al ratios of (4.7 ± 1.4) × 10-6 and

Date: 2005
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DOI: 10.1038/nature03470

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