The structural problem of the younger gabbros of north-east Scotland

Abstract
The evidence for and against deformation of the gabbroic masses is discussed. It is suggested that some of the so-called “older” igneous rocks, at Portsoy and along the western margin of the Huntly mass, are actually parts of the “younger” Huntly mass. The younger masses are later than the early fold structures of the Banffshire coast. Evidence from the primary structures of the igneous masses strongly favours deformation by the Boyndie-Buchan group of folds. Evidence against such folding, although suggestive, cannot be accepted without further work. It is likely that a solution will be found when the Insch and Huntly masses and the rocks of their thermal aureoles have been studied in detail.

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