Abstract
The Gjerstad-Morkeheia Complex contains a series of highly differentiated, iron and alkali enriched intrusions. The rocks range from basic to acid compositions and were variably mylonitised (under anhydrous conditions) before being metamorphosed (and hydrated) at upper amphibolite facies grade. They now form a series of ironenriched metagabbros, metadiorites and granodioritic gneisses, together with granitic and charnockitic augen gneisses. The augen formed by shearing of original megacrysts in the igneous rocks. A major mylonite zone formed at the same time.
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