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Large-scale thermal events in the solar nebula : evidence from Fe,Ni metal grains in primitive meteorites.

Meibom, Anders and Desch, Steven J. and Kort, Alexander N. and Cuzzi, Jeffrey N. and Petaev, Michael I. and Wilson, Lionel and Keil, Klaus (2000) Large-scale thermal events in the solar nebula : evidence from Fe,Ni metal grains in primitive meteorites. Science, 288. pp. 839-841. ISSN 0036-8075

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Abstract

Chemical zoning patterns in some iron, nickel metal grains from CH carbonaceous chondrites imply formation at temperatures from 1370 to 1270 kelvin by condensation from a solar nebular gas cooling at a rate of ~0.2 kelvin per hour. This cooling rate requires a large-scale thermal event in the nebula, in contrast to the localized, transient heating events inferred for chondrule formation. In our model, mass accretion through the protoplanetary disk caused large-scale evaporation of precursor dust near its midplane inside of a few astronomical units. Gas convectively moved from the midplane to cooler regions above it, and the metal grains condensed in these parcels of rising gas.

Item Type: Article
Journal or Publication Title: Science
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21639
Deposited By: ep_ss_importer
Deposited On: 23 Jan 2009 10:01
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:49
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21639

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