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Structural evolution in the Moine of northwest Scotland: a Caledonian linked thrust system?

Published online by Cambridge University Press:  01 May 2009

Robert W. H. Butler
Robert W. H. Butler
Affiliation:
Department of Geological Sciences, The University, South Road, Durham, DH1 3LE
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Abstract

A model is proposed whereby the Caledonian metamorphic basement-cover complex of northwest Scotland (the Moine) is considered as a linked thrust system. This system lies between the Moine thrust at its base and the Naver–Sgurr Beag slide at its top. Ductile fold and thrust zones, which developed at mid crustal levels at metamorphic grades from greenschist to amphibolite facies, are interpreted as decoupling from a detachment presently situated at relatively shallow depths. This model is illustrated by two preliminary balanced cross-sections. These imply shortening across the northwest Scottish Caledonides in excess of 130 km and probably over 200 km. When these structures are restored onto a crustal template a considerable quantity of lower crust is found to be required at depth. The most likely location for the lower crustal wedge is beneath the Grampian Highlands.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 1 , January 1986 , pp. 1 - 11
Copyright
Copyright © Cambridge University Press 1986

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