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Cellular precipitates of iron oxide in olivine in a stratospheric interplanetary dust particle

Published online by Cambridge University Press:  05 July 2018

Frans J. M. Rietmeijer
Frans J. M. Rietmeijer*
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA
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Abstract

The 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 ∼1100°C during atmospheric entry flash (5–15 s) heating.

Keywords

olivinecellular precipitatesiron oxideinterplanetary dust
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 403 , December 1996 , pp. 877 - 885
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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