Hutchison, R.; Bridges, J.C. and Gilmour, J.D.
Chondrules: chemical, petrographic and chronologic clues to their origin by impact.
Astronomical Society of the Pacific Conference Series, 341 pp. 933–950.
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Major element contents of chondrite groups were volatility controlled and established in a nebula after formation of Ca-Al-rich inclusions but before chondrules formed. Elemental abundances in chondrules tend to correlate with chemical affinity. Calcium was fractionated from Al by a planetary, not a nebular process. Chondrules were contemporaneous with igneous activity and aqueous and thermal metamorphism. Planetary bodies of varied size and structure co-existed during the first 50-80 million years of the Solar System, when chondrules formed and impact was common. We propose that most chondrules formed by impacts on differentiated bodies.
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