Pseudo-fractionation trend of the Fiskenæsset anorthosite complex, southern West Greenland

Abstract

The Fiskenæsset anorthosite complex is a sheet of layered igneous cumulates, 350-400 m thick, which was intruded into volcanic rocks, now amphibolites (Escher & Myers, this report). It was later disrupted by the intrusion of an enormous amount of granitoid material, mainly as sheets during regional deformation, and was metamorphosed in amphibolite and hornblende granulite facies about 2850 m.y. ago (Black et al., 1973). Fragments of similar rocks are widespread throughout the Archaean gneiss complex of Greenland, although the name Fiskenæsset complex is limited to the occurrences in the Fiskenæsset region (Bridgwater et al., in press).