Abstract

R. M. Burt & P. E. Brown write: We wish to comment on the significance of recent (currently unpublished) work on the Ben Nevis Complex (Burt 1994) with respect to the proposals made by Jacques & Reavy (1994) on the spatial distribution of the Newer Granites in the Southwest Highlands of Scotland.

Jacques & Reavy's (1994) model for the spatial distribution of Newer Granites in relation to lower crustal lineaments highlights the importance of regional tectonism during granite emplacement. According to the model, granites were emplaced at the intersection of NE–SW shear zones and NW–SE deep crustal lineaments. It is stated that the Ben Nevis Complex is sited at the intersection of the NE–SW Ballachulish–Corrieyairack shear zone and a NW–SE deep crustal lineament named the Rannoch Moor Lineament. There does not, however, appear to be any independent evidence for the Rannoch Moor Lineament, the main requirement for the existence of which appears to be the siting of the Ben Nevis Complex.

Jacques & Reavy (1994) note that within the Ben Nevis Complex the individual intrusive phases have a N–S orientation and cite this as evidence for the influence of the Rannoch Moor Lineament on the emplacement of the complex. We believe that this is an oversimplification of the true complexity of the pluton. There are, for instance, problems in locating the eastern margin of the G4 Outer Granite (cf. Haslam 1968) and both field and chemical evidence suggest that most of that part of

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