Published online by Cambridge University Press: 01 May 2009
The granite of the Dicq Rock is traversed by several veins of fine grained aplogranite. These in turn are cut by a large dolerite dyke, which has been intruded into a brecciated fault zone within the granite. Three large blocks of granite occur within the dolerite; these originally formed the southern boundary of the fault. The petrography of these rocks, and the influence of the micro-breccia upon the textures found in the marginal and central part of the dolerite, are considered in detail.