Geological investigations in East Greenland. Part VI. A differentiated basic sill enclosed in the Skærgaard intrusion, East Greenland and related sills injecting the lavas

Abstract

Three basic sills are described from the Skaergaard area of East Greenland. Two are intrusive into Tertiary lavas; parts of the third, the Basistoppen Raft, are preserved as a large inclusion in the Skaergaard gabbro complex. All three have a basal picrite resulting from gravity settling of early olivine crystals. The subsequent course of crystallization is described from the least altered sill, the Basistoppen Raft, in which the mineral sequence is closely similar to that of the Palisades Sill.