Gravity and rock densities in the Ilímaussaq area, South Greenland

Abstract

Early gravity measurements in South Greenland (Kejlsø, 1958; J. Olsen, personal communication) indicated a large positive Bouger anomaly around Narssaq. Newer terrain-corrected gravity data obtained by the Geodetic Institute as part of regional surveys in the Julianehåb and Godthåb regions showed this anomaly to be approximately over the Ilimaussaq alkaline intrusion. The anomaly is interesting not only because of its size, but also due to the lack of similar anomalies over other Gardar intrusions, such as the Igaliko complex.