Petrological studies of some alkalic and peralkalic dyke rocks from the Tugtutôq–Narssaq area

Abstract

The purpose of current research work on the dyke rocks and, to a lesser extent, the major Gardar intrusions of Tugtutôq and adjacent areas, is to elucidate more fully the development of the peralkine comenditic magrnas. The dyke swarm through the Tugtutoq region is instructive as it displays an apparently continuous series of rock-types from relatively basic microsyenites (or trachytes) to peralkalic microgranites (or comendites).