Two Kinds of Exsolution in Chondritic Olivine

J. R. Ashworth
Department of Geological Sciences, University of Aston in Birmingham, Birmingham B4 7ET

Summary: Transmission electron microscopy of several chondritic meteorites reveals exsolution products of two kinds in olivine. The coarser variety comprises particles that have nucleated heterogeneously on subgrain boundaries. Electron microprobe data confirm that these are chromite. The second variety, consisting of smaller precipitates distributed randomly, is interpreted as a homogeneously nucleated analogue of the first. It is potentially important as an indicator of cooling history. The aluminium-poor compositions of heterogeneously exsolved chromites suggest that some Cr may have entered tetrahedral sites in olivine during initial rapid crystallization from the melt.

Mineralogical Magazine; December 1979 v. 43; no. 328; p. 535-538; DOI: 10.1180/minmag.1979.043.328.14
© 1979, The Mineralogical Society
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