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

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

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005natur.434..998k&link_type=abstract

Nature, Volume 434, Issue 7036, pp. 998-1001 (2005).

Computer Science

37

Scientific paper

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 formation. 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 chondrules, as well as to the higher abundance of 26Al in CAIs; both observations indicate that CAIs pre-date chondrules by 1-3million 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 <1.2 × 10-6. We conclude that these CAIs had chondrule material added to them during a re-melting episode ~2Myr after formation of CAIs with the canonical 26Al/27Al ratio of 5 × 10-5.

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