Abstract
Abstract The metamorphic reactions observed in the polycyclic Precambrian gneisses of parts of western Sutherland and the Outer Hebrides are discussed in the light of other evidence bearing on the tectonic and metamorphic evolution of the Lewisian complex. The evidence that early granulite facies assemblages were transformed into successively lower-pressure assemblages seems consistent with the views expressed by several authors that the complex remained continuously at deep crustal levels for nearly a thousand million years after the earliest dated metamorphic event and that it began to rise towards the earth's surface during the Laxfordian metamorphic stage. The Scourie dyke swarm appears to have been emplaced under deep-seated conditions. The Laxfordian tectonic patterns record the effects of regional uplift and the associated metamorphic assemblages suggest local steepening of the geothermal gradient.
Published Version
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