Thermal history of chondrules during shock-wave heating

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Evaporation during chondrule melting may have resulted in depletion of volatile elements in chondrules. However, no evidence for a large degree of heavy-isotope enrichment has been reported in chondrules. In order to meet this observed constraint, the rapid heating rate at temperatures below the silicate solidus is required to form chondrules. We have developed a new shock-wave heating model with the radiative transfer among dust particles and calculated the thermal history of chondrules. We have found that optically-thin shock waves for the thermal continuum emission from dust particles can meet the high heating rate constraint, because the dust thermal emission does not keep the dust particles high temperature for a long time in the pre-shock region and dust particles are abruptly heated by the gas drag heating in the post-shock region. We have also found a trend that the optically-thick shock waves lead to rapid heating in the pre-shock region and rapid cooling in the post-shock region. On the contrary, the optically-thin shock waves have a tendency to cause slow heating in the pre-shock region and slow cooling in the post-shock region. Since these two tendencies seem to be inconsistent with observational constraints (rapid heating and slow cooling for chondrule formation), more careful quantitative studies are needed in the future to see if the shock-wave heating model can reproduce the observations.


Antarctic meteorite research   [List of Volumes]

Antarctic meteorite research 18, 239-252, 2005-03  [Table of Contents]

National Institute of Polar Research


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