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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 ,
Madeleine Sélo  and
Dieter Storzer
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
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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.

Keywords

olivinecrystal growthpicriteuraniumfission tracks
Type
Mineral Chemistry
Information
Mineralogical Magazine , Volume 50 , Issue 355 , March 1986 , pp. 27 - 31
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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