Comparative geochemistry of kimberlites from the Lac de Gras field, NWT - an integrated isotopic and elemental study - Dowall, D.P.; Pearson, D.G.; Nowell, G.M.; Kjarsgaard, B.A.; Armstrong, J.; Horstwood, M.S.A. (International Kimberlite Conference: Extended Abstracts, 2003)