Deformation of the Belhelvie Mass, Aberdeenshire

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Abstract
Synopsis: Evidence of shearing and mylonitization has been found to occur widely within and around the body of mafic and ultramafic igneous rocks that forms the Belhelvie intrusion. It is inferred that the original relations of these rocks were greatly disturbed when this deformation occurred and that the igneous mass has been largely detached from the country rocks into which it was emplaced and now has a complex structure. This disruption appears to have mainly occurred within 30 m.y. of the emplacement of the magma, but does not seem to be simply related to the development of the Buchan Anticline, the major, post-magmatic structure that earlier workers envisaged as occurring in this area.