Lamprophyric and kimberlitic dykes associated with the Sarfartôq carbonatite complex, southern West Greenland

Abstract

Lamprophyric and kimberiitic dykes are known to be widely distributed in the Holsteinsborg - Søndre Strømfjord area. Escher & Watterson (1973) published a map showing dyke concentrations in two areas, the coastal region between Holsteinsborg and Itivdleq, and an inland area between Søndre Strømfjord and Sukkertoppen Iskappe. In the latter area the 90 km2 Sarfartôq carbonatite complex was discovered in 1975 (Secher & Larsen, 1978, and in press). During the 1979 field season in this area, numerous lamprophyric and kimberiitic dykes were found. Most af them are associaled with !he Sarfartôq carbanatile complex, and occur as extensive cone sheets centred an the carbonatite, dipping 30-50° towards the centre.