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The Ultrafine Mineralogy of a Molten Interplanetary Dust Particle as an Example of the Quench Regime of Atmospheric Entry HeatingMelting and degassing of interplanetary dust particle L2005B22 at approx. 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 approx. = 450 C - 740 C. The implied ultrahigh cooling rates are calculated at approx. 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.
Document ID
19990010758
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Rietmeijer, Frans J. M.
(New Mexico Univ. Albuquerque, NM United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Meteoritics and Planetary Science
Publisher: Meteoritical Society
Volume: 31
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAGw-3626
Distribution Limits
Public
Copyright
Other

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