Crystallographic orientations of olivine inclusions in diamonds

In this work we report for the first time the crystallographic orientations of olivine inclusions trapped in diamonds from the Kaapvaal craton (South Africa) determined by single-crystal X-ray diffraction, and analyze them together with all available data in the literature. The overall data set indi...

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Bibliographic Details
Published in:Lithos 2016-11, Vol.265, p.312-316
Main Authors: Milani, S., Nestola, F., Angel, R.J., Nimis, P., Harris, J.W.
Format: Article
Language:English
Subjects:
Crystallographic orientation
Diamond
Olivine inclusions
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Summary:In this work we report for the first time the crystallographic orientations of olivine inclusions trapped in diamonds from the Kaapvaal craton (South Africa) determined by single-crystal X-ray diffraction, and analyze them together with all available data in the literature. The overall data set indicates no preferred orientation of the olivine inclusions with respect to their diamond hosts. However, diamonds containing multiple olivine inclusions sometimes show clusters of olivines with the same orientation in the same diamond host. We conclude that such clusters can only be interpreted as the remnants of single olivine crystals pre-dating the growth of the host diamonds. •Crystallographic relationship of olivine inclusions in Kaapvaal diamonds•Clusters of iso-oriented olivines in the same diamond as in Siberian craton•These olivines pre-existed the diamond.•The olivines were partially dissolved during diamond growth.
ISSN:0024-4937
1872-6143
DOI:10.1016/j.lithos.2016.06.010