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The Geology of Skerryvore, Dubh Artach, and Sule Skerry

Published online by Cambridge University Press:  01 May 2009

Frederick Walker
Frederick Walker
Affiliation:
University of St. Andrews.
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Extract

Skerryvore consists of acid gneiss with dark bands containing biotite and hypersthene. The mica was probably formed by the recrystallization of chloritic matter by heat from an underlying plutonic mass. The islet is cut by a 2 foot north-south dyke of olivine-dolerite.

Dubh Artach forms part of a sill of ophitic olivine-dolerite and is probably of Tertiary age.

Sule Skerry consists of andesine-anorthosite into which dark streaks consisting of hornblende and quartz have been injected at a later date to form a banded gneiss.

Type
Original Articles
Information
Geological Magazine , Volume 68 , Issue 7 , July 1931 , pp. 315 - 323
Copyright
Copyright © Cambridge University Press 1931

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References

page 315 note 1 Stevenson, A., Account of the Skerryvore Lighthouse, 1848, 32–3.Google Scholar

page 317 note 1 McCallien, W. J., Geol. Mag., LVII, 1930, 545.Google Scholar

page 317 note 2 Jehu, T. J., Trans. Roy. Soc. Edin., liii, 173.Google Scholar

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page 319 note 1 Mem. Geol. Survey, “Colonsay and Oronsay,” 1911, 95.Google Scholar

page 320 note 1 Walker, F., Quart. Jour. Geol. Soc., lxxxvi, 1930, 375.Google Scholar

page 320 note 2 Walker, F., Trans. Roy. Soc. Edin., lvi, 763.Google Scholar

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page 321 note 1 North Sea Pilot, 1895, 2, p. 25.Google Scholar

page 322 note 1 Jehu, T. J. and Craig, R. M., Trans. Roy. Soc. Edin., Iv, 471–3.Google Scholar