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Euhedral tetrataenite in the Jelica meteorite

Published online by Cambridge University Press:  05 July 2018

Alan E. Rubin
Alan E. Rubin*
Affiliation:
Institute of Geophysics and Planetary Physics, University of California, Los Angeles CA 90024, USA
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Abstract

A 65 × 107 µm grain of euhedral tetrataenite (ordered FeNi) attached to a similarly sized grain of troilite occurs within an impact-melt rock clast in the Jelica LL6 chondrite breccia. After impact melting, immiscible metallic Fe-Ni and troilite droplets formed within the silicate melt progenitor of the clast. At ⩾1200°C while the surrounding silicate was still partly molten, euhedral taenite with ∼ 50 wt.% Ni began crystallizing in one of the metal-troilite droplets. Troilite nucleated at one edge of the euhedral taenite grain and began to crystallize at ∼870°C. At 320°C the metal phase underwent an ordering reaction and formed tetrataenite. The unrecrystallized clast-host boundary and the differences in olivine composition and degree of polycrystallinity of troilite between the clast and Jelica host indicate that the clast was incorporated into Jelica during a late-stage brecciation event.

Keywords

tetrataenitetroiliteJelica meteoritebrecciation
Type
Mineralogy
Information
Mineralogical Magazine , Volume 58 , Issue 391 , June 1994 , pp. 215 - 221
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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