Emplacement patterns of kimberlites and ultramafic lamprophyres in an alkaline province located 64°- 67°N in southern West Greenland – Evidence from 40 new robust age analyses - Secher, K.; Heaman, L.M.; Nielsen, T.F.D; Jensen, S.M.; Schjøth, F.; Creaser, R.A. (International Kimberlite Conference: Extended Abstracts, 2008)