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The diagnostic geochemistry, relative abundance, and spatial distribution of high-calcium, low-alkali olivine tholeiite dykes in the Lower Tertiary regional swarm of the Isle of Skye, NW Scotland

Published online by Cambridge University Press:  05 July 2018

D. P. Mattey ,
I. L. Gibson ,
G. F. Marriner  and
R. N. Thompson
D. P. Mattey
Affiliation:
Department of Geology, Bedford College, London NW1 4NS
I. L. Gibson
Affiliation:
Department of Geology, Bedford College, London NW1 4NS
G. F. Marriner
Affiliation:
Department of Geology, Bedford College, London NW1 4NS
R. N. Thompson
Affiliation:
Department of Geology, Bedford College, London NW1 4NS
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Summary

Dykes from four sections across the axis of the Skye regional swarm have been analysed for major elements, Nb, Rb, Sr, Y, Zr, and rare-earth elements. 70 % of the dykes are characterized by relatively high CaO (11–12%), and low abundance of elements such as TiO2 (∼1%), K2O (0·05–0·20 %), Zr (30–60 ppm), with a light-rare-earth depleted chondrite normalized pattern. The remainder of the swarm comprises dykes equivalent in composition to the Skye Main Lava Series and dykes belonging to a further magma type distinguished by a flat chondrite normalized rare-earth pattern. The high-calcium, low-alkali tholeiite dykes are confined to a narrow persistent zone forming the major axis of dilation of the swarm; other basaltic dykes are axially less persistent and have a wider lateral distribution. The more evolved dykes tend to be restricted to central Skye.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 318 , June 1977 , pp. 273 - 285
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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Footnotes

1

Department of Geology, Imperial College of Science and Technology, London SW7 2AZ.

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