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Abstract
Data are presented from the Taavinunnanen gabbro massif in Lappland, Sweden. Olivine, augite, bronzite and plagioclase have been analysed. Samples have been taken from outcrops as well as from a 700 metres long core drilled vertically through the gabbro. It is concluded that the gabbro body is a composite, differentiated layered intrusion of lopolithic shape exhibiting cryptic as well as rhythmic layering. The original magma is suggested to be of tholeiitic composition.