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 journalArticlepeer-review

67 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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