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Cellular Precipitates Of Iron Oxide in Olivine in a Stratospheric Interplanetary Dust ParticleThe petrology of a massive olivine-sulphide interplanetary dust particle shows melting of Fe,Ni-sulphide plus complete loss of sulphur and subsequent quenching to a mixture of iron-oxides and Fe,Ni-metal. Oxidation of the fayalite component in olivine produced maghemite discs and cellular intergrowths with olivine and rare andradite-rich garnet. Cellular reactions require no long-range solid-state diffusion and are kinetically favourable during pyrometamorphic oxidation. Local melting of the cellular intergrowths resulted in three dimensional symplectic textures. Dynamic pyrometamorphism of this asteroidal particle occurred at approx. 1100 C during atmospheric entry flash (5-15 s) heating.
Document ID
19990010760
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
December 1, 1996
Publication Information
Publication: Mineralogical Magazine
Publisher: Mineralogical Society
Volume: 60
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAGw-3626
Distribution Limits
Public
Copyright
Other

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