The crust in the region of the Dalradian outcrop in Scotland is 25–35 km thick and may be divided into two areas separated by the NW–SE Cruachan Lineament. To the NE the crust is dominated by late Caledonian granites which give rise to surface topography isostatically compensated at shallow depth. To the SW, thick Dalradian sediments formed in an extensional basin later subjected to crustal shortening of 70–100 km achieved by zigzag obduction. Physical parameters of the deep crust are compatible with metamorphic grade increasing downwards except that the basic lower crust may be partly retrogressed and contain free water.

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