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Electron petrography of exsolution in an enstatite-rich orthopyroxene

✍ Scribed by James N. Boland

Book ID
104746429
Publisher
Springer
Year
1972
Tongue
English
Weight
686 KB
Volume
37
Category
Article
ISSN
0010-7999

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✦ Synopsis

Lattice defects along (100) planes in an orthopyroxene, En92.s-Fs~.0-Wo0.2, have been observed in the transmission electron microscope. From an analysis of the electron diffraction contrast at these defects it is proposed that the defects are regions of iron and possibly calcium enrichment. The defects are completely coherent with the lattice of the matrix and appear to be metastable or transition zones. They do not have any direct relationship with the spinodal decomposition proposed for the exsolution textures in some of the lunar pyroxenes of Apollo 11 and 12. Possible cationic ordering within these zones is discussed and the effects of such ordering on magnetic properties are considered.

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