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Marginal and Contact Phenomena of the Dorback Granite

Published online by Cambridge University Press:  01 May 2009

Frederick Walker  and
Charles F. Davidson
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Extract

The granite mass of Dorback in the Braes of Abernethy, a few miles east of the village of Tomintoul, occupies an area of from 5 to 6 square miles, the plutonic rocks outcropping through the siliceous schists and granulites of the Central Highlands of Scotland. For a highland district the exposures are rather poor, since the igneous rocks only rarely appear from under a thick covering of peat and glacial drift, but towards the eastern margin of the mass the complex is well exposed in the valleys trenched by the Allt Iomadaidh and tributary streams. Here the interest of the plutonic rocks is twofold, for they form a complex of acid, intermediate, and basic types exhibiting considerable variation in petrography, and they include a series of xenoliths of quartzite, schist, and limestone which range from a few inches in diameter to a great mass of limestone 1½ miles in length. This xenolith has been mapped by the Geological Survey of Scotland, and it was the occurrence of a contact between limestone and plutonic rocks at this locality that led to the investigations of the authors.

Type
Original Articles
Information
Geological Magazine , Volume 72 , Issue 2 , February 1935 , pp. 49 - 63
Copyright
Copyright © Cambridge University Press 1935

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References

page 50 note 1 MacGregor, A. G. and Kennedy, W. Q., “The Morvern-Strontian Granite,” Summ. Prog. Geol. Surv. for 1931, part ii, 1932, 105.Google Scholar

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page 62 note 1 “The Contact Metamorphism and Related Phenomena in the Neighbourhood of Marulan, New South Wales,” Geol. Mag., LXVIII, 1931, 289.Google Scholar

page 63 note 1 Read, H. H., “The Geology of Central Sutherland,” Mem. Geol. Surv., 1931.Google Scholar

page 63 note 2 MacGregor, A. G. and Kennedy, W. Q., op. cit.Google Scholar