“…Using satellite altimetry data, GFF volume 128 (2006), pp. 53-63. Article Downloaded by [North West University] at 12:32 20 December 2014 Wannäs & Hayling (1993) interpreted a gravity low in the same area as a possible rapakivi intrusion. From magnetic field interpretations Gyllencreutz (1998) assumed the existence of a mafic dike along the northern and western boundaries of the Strombus Basin, which, according to Sundblad et al (2003) may correlate with a Proterozoic dolerite dike that cuts across the southwestern part of Fårö.…”