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The Diorites and Associated Rocks of the Glen Tilt Complex, Perthshire

The Granites and Intermediate Hybrid Rocks.

Published online by Cambridge University Press:  01 May 2009

W. A. Deer
W. A. Deer
Affiliation:
Department of Geology, University of Manchester.
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Extract

The Glen Tilt Complex, one of the larger masses of the Newer Granites of the Central Highlands, is included in sheet 64 of the Geological Survey of Scotland. The greater part of this complex is a granite which is bounded on the south-west and southeast by an earlier series of intermediate and basic rocks. The granites described in this contribution are restricted to a small area at the south-eastern margin of the large granitic intrusion generally known as the Beinn Dearc granite. The smaller and independent intrusion of the Sron a ‘Chro’ granite and a number of smaller masses of granite associated with the marginal strip of diorites on the north-western side of Glen Tilt have also been examined. These small isolated areas appear to be contemporaneous with the intrusion of the main Beinn Dearc mass and have been intruded between the earlier diorites and the margin of the intrusion, a feature not uncommon in many of the other Scottish Newer Granites. A small independent mass of muscovite-biotite-granite intruded into quartz-mica-diorite occurs on Conlach Mhor. Although these rocks are completely isolated from both the biotite- and muscovite-biotite-granites of the main Beinn Dearc intrusion their essential similarity with the latter leaves no reasonable doubt of their common origin.

Type
Original Articles
Information
Geological Magazine , Volume 75 , Issue 4 , April 1938 , pp. 174 - 184
Copyright
Copyright © Cambridge University Press 1938

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References

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page 175 note 1 Barrow, G., and Craig, E. H. C., in “The Geology of Braemar, etc.”, Mem. Geol. Surv. Scot., 1912, p. 77.Google Scholar

page 175 note 2 A map showing the detailed distribution of the various rock types will be published later.Google Scholar

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page 176 note 2 The modes of all the analysed rocks are volume percentages from a single section of usual size measured on a Leitz integrating stage.Google Scholar

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page 183 note 1 The description of the diorites and associated appinitic rocks of the Glen Tilt Complex will be dealt with in a later paper. The general consideration of the formation of the acid rocks and the Complex as a whole will also be reserved until a later publication.Google Scholar

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