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Ben Nevis exposes more than 1 km depth of sections of a dissected caldera volcano that has an associated dyke swarm and has been intruded by concentric plutons. The renowned north face (picture) comprises continuous exposure of dacitic sheets, with breccias and some volcanogenic sediments. Breccias beneath the north face include Dalradian metamorphic basement, which has been interpreted as the caldera floor. However, it is predicted that a considerable thickness of ignimbrites lies at depth beneath the corrie floor at Ben Nevis, although it is possible that this will have been cut by plutonic intrusion(s). As at Etive, further south, Ben Nevis volcanic growth will have included formation of an extensive lava pile extruded via the Ben Nevis Dyke Swarm, probably at least in part prior to caldera volcanism.

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14y ago

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