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The structural evolution of the Dalradian of the Central Highlands of Scotland

Published online by Cambridge University Press:  03 November 2011

J. E. Treagus
J. E. Treagus
Affiliation:
Department of Geology, The University, Manchester M13 9PL, U.K.
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Abstract

The first section of the paper is concerned with a detailed account of the structure of the classic Schiehallion area. The account is extended to the flat belt via the Glen Lyon-Ben Lawers area. It is demonstrated that major D1 folds involve the whole of the Appin and Argyll groups and now face SE. However, the original D1 folds were probably open upward-facing folds which have been refolded and modified by the dominant D2 deformation. D2 is represented by an antiformal complex which culminates downwards in the Boundary Slide, a zone of strong deformation associated with NW translation of Dalradian over the ‘young Moine’ rocks. D3 has been responsible for the rotation of the originally flat D2 structures into their present ‘steep’ attitudes N of Glen Lyon. D4 is represented by the strike-swing of the lower Dalradian formations, possibly related to early movements on the two major faults that bound the area. The concept of a D1 Tay Nappe which roots in the ‘young Moine’ to the N is retained, although the scale and flat attitude of that fold is regarded as in part a product of D2.

Keywords

Appin GroupArgyll GroupCaledonidesGrampian Orogenypolyphase deformationPrecambrian‘young Moine’
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 78 , Issue 1 , 1987 , pp. 1 - 15
Copyright
Copyright © Royal Society of Edinburgh 1987

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