Geophysical field work on selected aeromagnetic anomalies in central West Greenland

Abstract

During the airborne operations carried out in 1975 and 1976 (Thorning, 1976, 1977), limited field activity was undertaken on the ground, mainly with the purpose of obtaining measurements of magnetic susceptibility of rocks. In 1977 no airborne operations were carried out and the summer's field work was concentrated on ground surveys. As in previous years the base camp was at Søndre Strømfjord where also a continuous analog and digital recording magnetometer was functional during the summer. Three field teams were supported by boat and helicopter (fig. 14); L. B. J. and C. M. worked in three areas from field camps north of Søndre Strømfjord, mainly with the purpose of collecting orientated samples from rocks causing magnetic anomalies; B. S. M. and S. A. P.\worked from ca ps inland east of Sukkertoppen with a detailed survey of the Majorqaq anomaly; L.T. worked from the GGU cutter Kornerup in Nordre Strømfjord, from another boat on the east coast of Nordlandet north of Godthåb, and with helicopter south of Søndre Strømfjord and in the Holsteinsborg area studying the rocks and structures causing the magnetic anomalies and obtaining values of the magnetic parameters of these rocks.