Petrology of the Renard igneous bodies: host rocks for diamond in the northern Otish Mountains region, Quebec

Petrology and Nd–Hf Isotope Geochemistry of the Neoproterozoic Amon Kimberlite Sills, Baffin Island (Canada): Evidence for Deep Mantle Magmatic Activity Linked to Supercontinent Cycles

“…Although on a worldwide basis this feature is rather unusual for Group-I kimberlites, it has been described from numerous hypabyssal kimberlites of the Superior craton in eastern Canada (e.g. Renard kimberlites; Birkett et al, 2004), as well as from carbonate-rich UML dykes (aillikites) of the Greenland^Labrador Diamond Province (Tappe et al, 2006(Tappe et al, , 2009Nielsen et al, 2009) (Fig. 9).…”

“…The Amon kimberlite sills appear generally more evolved (e.g. lower MgO, higher Al 2 O 3 and CO 2 ) compared with other Late Neoproterozoic hypabyssal kimberlites from eastern Laurentia such as the Renard intrusive bodies in Quebec (Birkett et al, 2004) and the Majuagaa dyke in West Greenland (Nielsen et al, 2009;Tappe et al, 2011) (Fig. 2).…”

“…The major element compositional diversity of the Amon sills is most probably a direct function of the presence of crystal-rich, cumulitic parts and residual carbonate melt-rich parts in the sill complex; that is, owing to flow differentiation and/or filter-pressing. Data for other Late Neoproterozoic kimberlites and UMLs from eastern Laurentia are shown for comparison: Renard hypabyssal kimberlites (Birkett et al, 2004); Majuagaa kimberlite dyke (Nielsen et al, 2009;Tappe et al, 2011); Greenland^Labrador UML dykes (Tappe et al, 2006(Tappe et al, , 2008(Tappe et al, , 2011Nielsen et al, 2009). The compilation of high-quality data for hypabyssal kimberlites from worldwide occurrences is taken from Kjarsgaard et al (2009).…”

Diamonds from the Renard kimberlites, Quebec

“…The bodies were emplaced into the Archean trondjhemite tonalite gneiss terrane of the eastern Superior province. Previous work on the mineralogy of the kimberlites has shown them to be in the overlap region between kimberlite and rocks of a "melnoitic" character (Birkett et al, 2004).…”

“…Radiometric dating of the hypabyssal (coherent) portions of the Renard kimberlites indicate emplacement ages from ~631-645 Ma (Birkett et al, 2004;Fitzgerald et al, 2008). This makes this kimberlite field one of the oldest in Canada, similar in eruption age to the Wemindji kimberlites (629±29Ma: Letendre et al, 2003).…”