The systematic geochemical variation between two tectonically separate successions in the southern Monadhliaths, Inverness-shire

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Abstract
Synopsis: Detailed mapping SE of Fort Augustus has revealed the presence of two distinct successions, lithostratigraphically subdivided into nine formations. The upper Corrieyairack Succession is overlain conformably by the Leven Schists of the Dalradian Supergroup and is in tectonic contact with the lower Glenshirra Succession. Both successions are geochemically distinct from the Lower Dalradian and are considered to be part of the Grampian Division. The two successions are also petrographically and geochemically distinct from each other and these differences are considered to represent variations in the nature of the original sediments. The lower Glenshirra Succession appears to represent a series of arkosic sediments deposited in an oxidising environment whilst the Corrieyairack Succession has affinities closer to greywackes. There are also minor differences in geochemistry between the individual formations, which support the structural and stratigraphic interpretation of the area.