A structural study of the granitic gneiss of Western Ardgour, Argyll and Inverness-shire

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Abstract
Synopsis: The paper describes a structural study of part of the discontinuous belt of granitic gneiss extending from Glen Tarbert (Argyll) to north of Loch Quoich (Inverness-shire). The granitic gneiss outcrops immediately west of the boundary between the ‘highly inclined’ and ‘flat’ belts of the Moines (the Loch Quoich line) which is the eastern limit of outcrop of the regional migmatite belt (‘injection belt’). The Loch Eil psammitic belt (which constitutes the ‘flat’ belt) is the highest structural and stratigraphical unit of the area, overlying a thin pelitic horizon which rests on striped schists. Contrary to earlier correlations it is thought that all these units may overlie the classical Morar succession. Four main fold episodes (F1–F4) are recognisable. The granitic gneiss is entirely concordant, lies at the same horizon as the striped schists, and probably occupies the core of a tight F2 fold of highly variable plunge. Formation of the gneiss began prior to the second fold movement and it behaved during deformation as did the adjacent metasediments. The structural history of the gneiss is consistent with a migmatitic origin, and it was concentrated in a narrow belt by tectonic control.

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