Summary An occurrence of kyanite in the inner aureole of a granodiorite intrusion is described from south-western Ghana. Greenschist facies phyllites have been elevated to the amphibolite facies and the regional strike of these country rocks has been disrupted by the intrusion, so that clear evidence is available of the time relationships. It is concluded that the kyanite crystallized as the result of the forceful intrusion of the granodiorite, probably under epizonal conditions.
Abstract Field evidence and theoretical arguments are used to elucidate the form of the intrusion. In the absence of a more accurate term this is described as chonolithic. Passive injection of the magma into a potential vacuum has enabled control to be exercised on the intrusion-form by the country rocks and their structures. The effects of this control are discussed.
