
doi: 10.4095/213271
This report presents results of till sampling in the vicinity of the Peddie kimberlite, Bucke Township, in the Lake Timiskaming kimberlite cluster of northeastern Ontario. Thirty till samples were collected (mainly south) of the Peddie kimberlite to document the nature of glacial dispersal from the kimberlite, using both indicator minerals and till geochemistry. Most of the kimberlite indicator minerals in till were found in the finest of the three size fractions (0.25 to 0.5, 0.5 to 1.0 and 1.0 to 2.0 mm) of heavy mineral concentrates examined. Till in the vicinity of the Peddie kimberlite contains a distinctive kimberlitic geochemical signature defined by Ni, Cr, Nb, and Ta, which is most apparent in the coarse to very coarse sand (0.5 to 2.0 mm) and the silt+clay (<0.063 mm) fractions. Two dispersal trains in till were detected near the Peddie kimberlite. One short train immediately down-ice of, and derived from, the Peddie kimberlite is defined by the minerals olivine and Mg-ilmenite, with elevated concentrations of Ni, Cr and Nb. A second dispersal train 800 m southwest of the Peddie kimberlite and trending southeast, is defined by abundant Mg-ilmenite and Cr-pyrope, and elevated concentrations of Nb, and Ta. This second dispersal train is likely derived from the Gravel kimberlite 4 km up-ice (northwest) and/or an unknown kimberlite.
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