Electron-probe Microanalysis of Coronas in a Troctolite from Sulitjelma, Norway

Roger Mason
Department of Geology, University College, London W.C. 1

Summary: The results of the electron-probe microanalysis of the three minerals from orthopyroxene-amphibole-spinel coronas between olivine and plagioclase in a troctolite from Sulitjelma, Norway, are presented. They are shown to be incompatible with a late-magmatic origin for the coronas, but compatible with an origin by diffusion of material in solution in an aqueous medium across the olivine-plagioclase interface. This theory is discussed on a quantitive basis in the light of the microanalytical data.

Mineralogical Magazine; December 1967 v. 36; no. 280; p. 504-514; DOI: 10.1180/minmag.1967.036.280.04
© 1967, The Mineralogical Society
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