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The petrology and geochemistry of the Creag Dubh composite sill, Whiting Bay, Arran, Scotland

Published online by Cambridge University Press:  01 May 2009

N. W. Rogers  and
I. L. Gibson
N. W. Rogers
Affiliation:
Department of Geology, Bedford College, University of London, London NW1 4NS
I. L. Gibson
Affiliation:
Department of Geology, Bedford College, University of London, London NW1 4NS
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Summary

Analysis of 17 samples for both major and trace elements reveals that, unlike most other Tertiary composite intrusions, the Creag Dubh sheet possesses silicic margins and a doleritic centre. The two rock types grade together rapidly without chilling at the upper and lower internal contacts. However, there is evidence for mixing of the two magma types prior to or during emplacement with the production of limited amounts of intermediate hybrids. The central dolerite appears to be later than the marginal felsites which in places back-vein the dolerite. The sequence of intrusion is tentatively related to the upward draining of a strongly zoned magma chamber.

Type
Articles
Information
Geological Magazine , Volume 114 , Issue 1 , January 1977 , pp. 1 - 8
Copyright
Copyright © Cambridge University Press 1977

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References

Bailey, E. B. & McCallien, W. J. 1956. Composite minor intrusions and the Slieve Gullion Complex, Ireland. Lpool Manchr geol. J. 1, 466.CrossRefGoogle Scholar
Daly, R. A. 1933. Igneous Rocks and the Depths of the Earth. McGraw-Hill, New York.Google Scholar
Macgregor, M. 1965. The Excursion Guide to the Geology of Arran. Glasgow.Google Scholar
Padfield, T. & Gray, A. 1971. Major element analysis by X-ray fluorescence — a simple fusion method. Bull Philips Analyt. Equip. FS35. 4 pp.Google Scholar
Pearce, J. S. & Cann, J. R. 1973. Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth Planet. Sci. Lett. 19, 140.CrossRefGoogle Scholar
Rao, M. S. 1958. Composite and multiple intrusions of the Lamlash—Whiting Bay region, Arran. Geol. Mag. 95, 265.Google Scholar
Reynolds, D. L. 1951. The geology of Slieve Gullion and Carickearnan; an actualistic interpretation of the Tertiary gabbro-granophyre complex. Trans. R. Soc. Edinb. 62, 85.CrossRefGoogle Scholar
Tyrrell, G. W. 1928. The geology of Arran. Mem. Geol. Surv. G.B.Google Scholar
Upton, B. G. J. 1962. Geology of Tugtutoq and neighbouring islands, S. Greenland, part 1. Medd. Grønland 169, 60 pp.Google Scholar
Wager, L. R., Vincent, E. A., Brown, G. M. & Bell, J. D. 1965. Marscoite and related rocks of the Western Red Hills complex, Isle of Skye. Phil. Trans. R. Soc. Lond. A 257, 273.Google Scholar