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An investigation of olivine crystal growth in a picrite dyke, using the fission track method

Published online by Cambridge University Press:  05 July 2018

Paul Henderson
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD, UK
Madeleine Sélo
Affiliation:
Museum National d'Histoire Naturelle, Laboratoire de Minéralogie, 61 rue Buffon, 75005 Paris, France
Dieter Storzer
Affiliation:
Museum National d'Histoire Naturelle, Laboratoire de Minéralogie, 61 rue Buffon, 75005 Paris, France

Abstract

A picrite dyke with an olivine-bearing chilled margin and an olivine-rich centre has been used to test for the presence of a boundary layer around rapidly grown olivine crystals and for any variations in the olivine/melt partition coefficient for uranium as a result of probably different crystal growth rates. The technique of fission-track mapping is shown to be suitable for this kind of study despite the very low uranium concentrations in the olivines. A boundary layer appears to be present around some olivine crystals but it is not a consistent feature. Uranium partition between olivine and melt was not affected by different crystal growth rates, as revealed by different crystal morphologies.

Type
Mineral Chemistry
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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