Electron Petrography of High-Temperature Oxidation in Olivine from the Rhum Layered Intrusion

A. Putnis
Department of Mineralogy and Petrology, Downing Place, Cambridge, CB2 3EW

Summary: Electron-microscope observations of the oxidation products of olivine suggest that oxidation results in the formation ofplatelets of an ‘oxidized olivine’ phase, which has a superstructure of the olivine structure. Subsequently this intermediate phase breaks down by a cellular decomposition process to a eutectoidal intergrowth of magnetite and pyroxene. This intergrowth is responsible for the dendritic magnetite inclusions commonly observed in some olivines from Rhum.

Mineralogical Magazine; June 1979 v. 43; no. 326; p. 293-296; DOI: 10.1180/minmag.1979.043.326.12
© 1979, The Mineralogical Society
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