Microstructural analysis of Wark-Lovering rims in the Allende and Axtell CV3 chondrites: Implications for high-temperature nebular processes

Diana Bolser, Thomas Zega, Abu Asaduzzaman, Stefan Bringuier, Steven B. Simon, Lawrence Grossman, Michelle S. Thompson, Kenneth J. Domanik

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

A coordinated, electron-backscatter-diffraction (EBSD) and transmission electron microscope (TEM) study was undertaken to obtain information on the origin of rims on refractory inclusions in the Allende and Axtell CV3 chondrites. These measurements were supported by theoretical modeling using density functional theory. Crystal-orientation analysis of Wark-Lovering rims via EBSD revealed pyroxene grains with similar crystallographic orientations to one another in both inclusions. An epitaxial relationship between grains within the diopside and anorthite rim layers was observed in Allende. TEM examination of the rims of both samples also revealed oriented crystals at depth. The microstructural data on the rims suggest that grain clusters grew in the form of three-dimensional islands. Density functional theory calculations confirm that formation of oriented grain islands is the result of energy minimization at high temperature. The results point toward condensation as the mode of origin for the rims studied here.

Original languageEnglish (US)
Pages (from-to)743-756
Number of pages14
JournalMeteoritics and Planetary Science
Volume51
Issue number4
DOIs
StatePublished - Apr 1 2016

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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