Uranium content of the Fiskenæsset anorthosite complex at Majorqap qâva

Abstract

The uranium content of 25 samples from the Majorqap qâva outcrop of the Fiskenæsset anorthosite complex were determined to obtain an outline of the uranium distribution both in the different major rock types and at different stratigraphic levels within this layered igneous complex. Analyses were made at the Danish Atomic Energy Commission Research Establishment at Risø by delayed neutron counting folIowing neutron activation, under the direction of Leif Løvborg early in 1973. The Majorqap qåva outcrop is divided into four major units which are in upward succession: lower leucogabbro (50 m), gabbro (40 m), upper leucogabbro (60 m), and anorthosite (200 m). The main rock types are metamorphosed and partly metamorphosed anorthosite, leucogabbro, gabbro, and ultramafic rock, which chiefly consist of plagioclase (An 80-98) and green hornblende, with minor amounts of biotite, pyroxene, olivine, spinel, magnetite and chromite.