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

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

doi:10.1111/maps.12620

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

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

School of Science, Engineering & Technology (Harrisburg)

Research output: Contribution to journal › Article › peer-review

14 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 language	English (US)
Pages (from-to)	743-756
Number of pages	14
Journal	Meteoritics and Planetary Science
Volume	51
Issue number	4
DOIs	https://doi.org/10.1111/maps.12620
State	Published - Apr 1 2016

All Science Journal Classification (ASJC) codes

Geophysics
Space and Planetary Science

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

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.",

author = "Diana Bolser and Zega, {Thomas J.} and Abu Asaduzzaman and Stefan Bringuier and Simon, {Steven B.} and Lawrence Grossman and Thompson, {Michelle S.} and Domanik, {Kenneth J.}",

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T2 - Implications for high-temperature nebular processes

AU - Bolser, Diana

AU - Zega, Thomas J.

AU - Asaduzzaman, Abu

AU - Bringuier, Stefan

AU - Simon, Steven B.

AU - Grossman, Lawrence

AU - Thompson, Michelle S.

AU - Domanik, Kenneth J.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - 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.

AB - 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.

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

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