Chondrules: Chemical, Petrographic and Chronologic Clues to Their Origin by Impact

Details Chondrules: Chemical, Petrographic and Chronologic Clues to Their Origin by Impact Chondrules: Chemical, Petrographic and Chronologic Clues to Their Origin by Impact

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..341..933h&link_type=abstract

Chondrites and the Protoplanetary Disk, ASP Conference Series, Vol. 341, Proceedings of a workshop held 8-11 November 2004 in Ka

Astronomy and Astrophysics

Astronomy

3

Scientific paper

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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