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How granitic melts strengthen the crust - resolving the "pegmatite paradox"

Part of The Shear Zone Channel. Granitic melts are commonly proposed to act as weakening mechanisms for deforming continental crust, especially deep in mountain belts. And geologists finding pegmatite, coarse-grained granite sheets, in deformed rocks in outcrops cite these as evidence to support this idea. But many such deductions are misleading... Follow Rob to a spectacular field location on Scotland's north coast, building a counter-argument - in which the intrusion of melts that crystallise pegmatites have only served to strengthen deforming crust. #granite #geology #NC500