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

Anders Meibom, Steven J. Desch, Alexander N. Krot, Jeffrey N. Cuzzi, Michael I. Petaev, Lionel Wilson, Klaus Keil

Research output: Contribution to journalArticle

66 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)839-841
Number of pages3
JournalScience
Volume288
Issue number5467
DOIs
StatePublished - May 5 2000
Externally publishedYes

ASJC Scopus subject areas

  • General

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