Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..237r&link_type=abstract
Meteoritics and Planetary Science, Vol. 31, p. 237-242 (1996)
Physics
13
Scientific paper
Melting and degassing of interplanetary dust particle L2005B22 at ˜1200 °C was due to flash heating during atmospheric entry. Preservation of the porous particle texture supports rapid quenching from the peak heating temperature whereby olivine and pyroxene nanocrystals (3 nm-26 nm) show partial devitrification of the quenched melt at T ˜=450 °C-740 °C. The implied ultrahigh cooling rates are calculated at ˜105 °C/h-106 °C/h, which is consistent with quench rates inferred from the temperature-time profiles based on atmospheric entry heating models. A vesicular rim on a nonstoichiometric relic forsterite grain in this particle represents either evaporative magnesium loss during flash heating or thermally annealed ion implantation texture.
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