Wj. Davis et Ba. Kjarsgaard, A RB-SR ISOCHRON AGE FOR A KIMBERLITE FROM THE RECENTLY DISCOVERED LAC DE GRAS FIELD, SLAVE PROVINCE, NORTHWEST CANADA, The Journal of geology, 105(4), 1997, pp. 503-509
A Rb-Sr phlogopite macrocryst-whole rock isochron age of 47.5 +/- 0.5
Ma is reported for a kimberlite from the recently discovered Lac de Gr
as field in the Slave Province, northwestern Canada. This is the young
est reliably dated kimberlite occurrence in the world and correlates c
losely in time with emplacement of kimberlites in Tanzania and Yakutia
, indicating a widespread kimberlite emplacement event on three differ
ent cratons in the Eocene.