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

Research output: Contribution to journalJournal article

Published

  • Anders Meibom
  • Steven J. Desch
  • Alexander N. Kort
  • Jeffrey N. Cuzzi
  • Michael I. Petaev
  • Lionel Wilson
  • Klaus Keil
Journal publication date05/2000
JournalScience
Volume288
Number of pages3
Pages839-841
Original languageEnglish

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.