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A differentiated ultrabasic sheet on Sgurr Dearg, Isle of Skye

Published online by Cambridge University Press:  05 July 2018

Fergus G. F. Gibb
Fergus G. F. Gibb*
Affiliation:
Department of Geology, University of Manchester
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Summary

The field relations, mineralogy, and petrography of a small Tertiary ultrabasic sheet are briefly described. Chemical analyses show that compositional variations exist within the intrusion and electron-probe analyses demonstrate that optically undetectable zoning is present in the olivine. Throughout the intrusion, which is composed primarily of forsteritic olivine, calcic plagioclase, and clinopyroxene, there is a differential distribution of olivine. This distribution is attributed to flow differentiation during intrusion followed by gravitative sinking of olivine crystals.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 299 , September 1972 , pp. 811 - 818
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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