Comparative petrology of the leucocratic syenites of the Northwest Highlands of Scotland
- 1 January 1972
- journal article
- research article
- Published by Wiley in Geological Journal
- Vol. 8 (1), 71-82
- https://doi.org/10.1002/gj.3350080107
Abstract
The normative mineralogy of the Loch Borralan, Loch Ailsh and Loch Loyal leucosyenites is compared to the System Ab – Or – An ‐ Qz. At Borralan, the upper quartz‐syenites of Cnoc‐na‐Sroine plot within the plagioclase volume, the lower perthosites within the alkali feldspar volume. This mineralogy cannot have been attained by in situ crystal fractionation. The Ailsh rocks plot within the plagioclase volume, the Loyal syenites within the alkali feldspar volume. The three complexes cannot have been derived from a single magma body at depth, and are not precisely coeval.This publication has 19 references indexed in Scilit:
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