The geology of Pepin Island and part of the adjacent mainland

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Abstract
The oldest rocks of the Pepin Island Igneous Complex are the Echinus Granite, Platform Gneiss, and Fall Conglomerate of the Pepin Group. These rocks are intruded by a plug and radial dike swarm of hornblende and quartz-biotite andesite belonging to the Palisade Andesite Formation, which, with the well known Brook (Street) Volcanic Formation, constitutes the Drumduan Group. The youngest rocks in the complex belong to the Tasman Group (Cable Granodiorite). They are quartz diorites, tonalites, and hornblende granodiorites crossed by veins and schlieren of augite lamprophyre, hornblende granite, hornblende granophyre, and granophyric hornblende pegmatite. The rocks of the Complex are considerably metasomatised, albite-epidote-quartz veins are common, and pyrite mineralisation is present.

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