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Regional and tectonic implications of parallel Caledonian and Permo-Carboniferous lamprophyre dyke swarms from Lismore, Ardgour

Published online by Cambridge University Press:  03 November 2011

M. A. Morrison ,
G. L. Hendry  and
P. T. Leat
M. A. Morrison
Affiliation:
Department of Geological Sciences, University of Birmingham, P.O. Box 363, Birmingham B15 2TT, U.K.
G. L. Hendry
Affiliation:
Department of Geological Sciences, University of Birmingham, P.O. Box 363, Birmingham B15 2TT, U.K.
P. T. Leat
Affiliation:
Department of Geology, Imperial College of Science and Technology, Prince Consort Road, London, SW7 2BP, U.K.
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Abstract

Geochemical data are presented for 166 minor intrusions collected across the axis of the Ardgour swarm in the Isle of Lismore. The intrusions can be divided into: an alkali basalt-camptonite-monchiquite group resembling other Scottish Permo-Carboniferous dykes; a group of calc-alkaline (shoshonitic) lamprophyres, diorites and porphyrites with affinities to the late Silurian-early Devonian appinite suite of Scotland; and Tertiary dolerites. The different groups cannot be unambiguously distinguished in the field and secondary alteration precludes petrographic division in many cases. The data indicate that Caledonian and Permo-Carboniferous lamprophyres have probably been confused in previous accounts of dyke distributions in the region. In Lismore the two groups have identical azimuths but the Caledonian intrusions appear to have a greater aggregate volume. The implications for tectonic and regional models of the area are discussed.

Keywords

Alkalinecalc-alkalineGreat Glen Faultintrusion mechanismspotassiumScotlandshoshoniteTertiarytrace elements
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 77 , Issue 4 , 1987 , pp. 279 - 288
Copyright
Copyright © Royal Society of Edinburgh 1987

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